Instructions

INSTRUCTIONS FOR USE

Contents

1. INTRODUCTORY PROVISIONS
2. GENERAL DESCRIPTION
3. USAGE
4. CONSTRUCTION
4.1 BIOLOGICAL REACTOR BIO CLEANER
4.2 ELECTRIC COMPONENTS
4.3 LABELLING
5. PURPOSE OF THE WWTP
6. TECHNICAL PARAMETERS
6.1 BASIC DIMENSIONS AND WEIGHTS
6.2 TECHNOLOGICAL EQUIPMENT
6.3 HYDROLOGICAL DATA
6.4 NOISE LEVEL
7. PUTTING THE WWTP INTO OPERATION
7.1 DUTIES OF AN AUTHORIZED SELLER
7.1.1 Manipulation and transport
7.1.2 Installation
7.1.3 Covering of the basin, access to the basin
7.1.4 Connection of the WWTP
7.1.5 Assembly instructions
7.1.6 Putting into operation, testing, setting up
7.1.7 Passing the WWTP to the customer
7.2 OPERATOR'S DUTIES
7.3 PUTTING INTO OPERATION
7.4 SHUT-DOWN AND RE-STARTING INTO OPERATION
8. SUPERVISION AND MAINTENANCE OF THE WWTP
8.1 DUTIES OF THE OPERATOR
8.1.1 Basic facts
8.1.2 Operating the WWTP
8.1.3 Control unit BCC-02
8.1.4 Adjustment of air supply to the WWTP
8.1.5 Inspection and maintenance of the WWTP - summary of activities
8.1.6 Instruments and tools for operating the WWTP
8.2 OPERATION JOURNAL
8.3 INSTRUCTIONS IN CASE OF DEFECTS AND FAILURES OF THE WWTP
8.3.1 Most frequent defects and failures of the WWTP
8.3.2 Functional faults - overview
8.3.3 Technological defects
8.3.4 Activities of the operator that may lead to a violation of the warranty:
9. INSPECTION OF THE PARAMETERS OF THE WWTP
10. SAFETY AND HYGIENE AT WORK
10.1 GENERAL SAFETY REQUIREMENTS AT WORK
10.2 ACCIDENT PROTECTION
10.3 SUMMARY OF SELECTED REGULATIONS AND TECHNICAL STANDARDS
11. LIST OF ACCOMPANYING PROJECT DOCUMENTATION

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1. Introductory provisions

The Waste-water Treatment Plant service manual (hereinafter only WWTP), or the Operational Instructions were prepared in accordance with TNV 75 6911 “Operational Instructions of the Sewerage System” and in accordance with project documentation. All staff are required to follow the instructions of this Service Manual. This Service Manual follows valid regulations and corresponds to contemporary technological equipment of WWTPs and to the way in which the sewerage system and the WWTPs are operated.

To ensure proper run of the WWTP, only an authorized person is entitled to perform activities within the range that is explicitly specified here.

To be entitled to a warranty claim, it is vital that the instructions of this Service Manual (Operational Instructions) are followed.

2. General Description

BIO CLEANER is a biological Waste-water Treatment Plant working on the principle of a technological process with a low-load activation and with the aerobic stabilization of sludge.

The whole process of purification is done in a self-regulated way in one basin - a biological reactor BIO CLEANER. This reactor responds automatically to changes in the flow-volume and to changes in concentration of waste-water contamination during the day. The WWTP is operated by a special control unit BCC-02.

Forced circulation of the biomass and circulation of waste-water in the reactor is provided by a hydraulic-pneumatic pump.

The basin of the WWTP - the biological reactor BIO CLEANER is a plastic container which can be installed in the field. If a special order is made, the reactor can be installed in a concrete basin. Additional component parts of the WWTP are an electro-box and an air compressor, that are installed near the basin, e.g. in a cellar, in a garage etc.

3. Usage

The BIO CLEANER Waste-water Treatment Plant is designed to purify waste water from houses, business premises, etc.

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4. Construction

The WWTP BIO CLEANER is comprised of a biological reactor BIO CLEANER, a membrane air pump and an electro-box with an electronic control unit. If a special order is made, a plastic extension, possibly also a laminate or wooden cover can be supplied.

The supplement to this manual shows the diagram of the plant with the location of the main parts.

Waste water runs through the inflow sewerage piping system (1) into the detritus trap (2) which is placed in the inflow zone (3). Waste-water is mixed with activated return-sludge in the inflow zone by rough bobble aeration element (15). Having been mixed, the mixture of purified water and of the activated sludge flows into the activating zone (4) where it is oxydized by aeration elements AME 260 (16). These aeration elements are fastened to the bottom of the basin. The biomass flows from the activating zone to the final clarification zone (5), where purified water and activated sludge are separated. Purified water flows over the underflow baffle (6) into the outlet (7). Activated sludge sediment is pumped from the bottom of the final clarification zone by a hydraulic-pneumatic pump (8) back to the inflow zone. WWTP is operated from an electro-box (9) which is connected to a voltage of 230 V/50 Hz. A control unit BCC-02 which controls the entire WWTP including particular electromagnetic valves is installed in an electro-box; the electromagnetic valves control the air supply into the hydraulic-pneumatic pumps. A membrane-pump (11) is connected from the electro-box through a socket (10). Compressed air goes from the membrane pump into the air distributor (14) through a PVC hose (12). In the air distributor air is distributed into rough bobble aeration element (15), and fine bobble elements (16) and into a hydraulic-pneumatic pump (8). The rest of the distribution goes through a PE hose. From the junction (13) compressed air goes into the valves in the electro-box; the valves are controlled by the control unit BCC-02. The valves at given intervals operate the pump which pumps out purified water from the final clarification zone (18) into the discharge piping. Afterward, these valves switch on the pump for aeration of the final clarification zone (19), and thereafter they switch on the pump for the withdrawal of floating contaminants from the surface of the final clarification zone (20) into the inlet zone.

4.1 Biological reactor BIO CLEANER

The biological reactor is constructed as a plastic basin with plastic built-in elements. All metal parts of the construction are made of stainless steal.

The built-in elements divide the basin into three hydraulically independent sections.
- the inlet zone
- the activation - nitrifying section
- the final clarification zone

The detritus trap

The aerated removable detritus trap has the shape of a perforated basket with dimensions 250 x 400 mm, with 16 mm diameter holes and is located in the inlet zone.

The inlet zone

In the inlet zone nitrogen pollutants are removed from the waste-water in the absence of airy oxygen. Waste-water and return-sludge flow into the basin from the final clarification zone. Return-sludge is mixed with waste-water pneumatically by a mid-bubble aeration element which has a regulating valve to regulate the intensity of mixing.

The activation - nitrification zone

The activation zone of the biological reactor is located between the walls of the basin, the inlet zone and the final clarification zone. Air blasting into single-bubble aeration elements ensures the required water flow-volume.

Final clarification zone

The final clarification zone is made of cone-shaped plastic, increasing in width towards the surface and ending in a cylinder. A pipe of the floating-pollutant trap and of degasification of the incoming activated mixture is fixed in the inlet of the final clarification zone. The outflow of purified water is regulated by a crest of spillway on the outlet pipe. There is an underflow baffle for catching floating pollutants in front of the outlet pipe (for BC 4 to BC 15 the underflow baffle is formed by the wall of the final clarification zone and the outlet goes from a separated outlet chamber; this chamber is welded on the wall of the final clarification zone). Other mechanisms are also placed in the final clarification zone: a hydraulic-pneumatic pump which ensures periodical lowering of the operating water level; a submersible frame for mixing the surface of the final clarification zone and a pump for withdrawal of the floating pollutants from the surface of the final clarification zone.

Aeration and mixing mechanisms, a hydraulic-pneumatic pump

The biological process of purification is supplied with sufficient oxygen by means of a single-bubble aeration system. This system ensures that the suspension of the activated sludge is kept elevated. Air is supplied by an air membrane pump, the type depending on the particular WWTP (type) capacity. Depending on the type of WWTP, the aeration system involves two or three parts of aeration elements. A hydraulic-pneumatic pump (mammoth) is used for pumping settled sludge from the final clarification basin into the inlet area.

The air-supply inlet into the aeration system and to the hydraulic-pneumatic pump is regulated by the valves on the air-distributor.

4.2 Electric components

Electric components of the WWTP in the electro-box help to control the work of the WWTP. A membrane-air pump with its own thermal fuse is connected to the electro-box. The electro-box also contains electro-magnetic valves which control pneumatic pumps. These valves control the air-supply inlets into the hydraulic-pneumatic pumps during particular cycles of floating sludge and floating pollutants removal from the final clarification zone. The valves are operated by a special control unit BCC-02, which is placed in the electro-box. The electro-box is wired to the grid by a cable CYKY 3 x 1.5 mm2/230V, which is safeguarded by a separate circuit breaker (motor starter) in the switch-board of the object.

The electro-box is a plastic box with an adequate coverage, built-in components and circuit breakers. The WWTP is devised to work in humid conditions and in conditions with deleterious effects, in accordance with The Czech Standard _SN 33 2000-3, where the conditions are specified by one of the number-letter combinations: AA 4, AA 6, AB 4, AB 6, AD 4, AF 3.

4.3 Labelling

The WWTP is labelled by a label which is fixed over the outlet pipe of the WWTP.
The electro-box is labelled in accordance with the Czech Standard _SN EN 60335-1.

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5. Purpose of the WWTP

The principle of complex waste-water treatment is based on biological purification using heterogeneous biological sludge which is kept in buoyancy with simultaneous denitrification, where organic contamination of waste-water serves as the source of carbon.

Description of the technology

Waste-water flows from the sewerage piping system into a removable detritus trap (screenbar baskets - screens if need be). This detritus trap is placed in the inlet zone of the biological reactor. The inlet zone is the first part of the activation basin and is separated from the second part by underflow baffles, where the outlet of the hydraulic-pneumatic pump for pumping concentrated sludge is placed. Here, waste water is instantly mixed with activating sludge, and consequently the biochemical process of purification continues. This part of the activation basin is equipped with a mid-bubble aeration element. A regulation valve generally reduces the amount of air so that floating pollutants flowing into the system with waste-water could be caught effectively.

If the process of biodegradation of floating contaminants in the inlet zone is not completely finished, these contaminants, caught by the underflow baffles, must be removed during a regular inspection. After the activating mixture is mixed with waste-water using the aeration system in the inlet zone, the mixture of purified water and activating sludge flows out under the underflow baffles into the second, activation-nitrification area. Here, the aeration elements continue the intensive process of biological purification oxidizing the mixture. After the process of biological purification in the activation - nitrification area is finished, the mixture of activated sludge and purified water flows into the final clarification zone. The mixture flows there through a detritus trap, where the mixture is also degassed. In the final clarification zone, undissolved sediment particles are thickened at the bottom of the final clarification basin. Once the activated sludge is separated from the purified water through sedimentation in the final clarification zone, the purified water continues through an overflow channel into the outlet piping of the WWTP. Surface water in sedimentation tank is aerated and mixed thanks to submersed aeration frame for better sedimentation of the sludge.
In the bottom, narrow section under the final clarification zone is located a hydraulic-pneumatic suction pump which thickens activated sludge. This ensures that settled and thickened sludge is pumped back to the process of purification. The outlet of this pump goes to the inlet zone of the WWTP.

During operation, the load by polluting matters as well as the hydraulic conditions may develop unevenly in the inlet zone of the WWTP. This fact sometimes results in the flotation of activated sludge in the final clarification zone and in pollutants floating on the surface of the final clarification zone. Thanks to the underflow baffle which is placed in front of the overflow channel of the outlet from the final clarification zone, these factors do not affect the quality of purified water. Nevertheless, it is necessary to remove these pollutants regularly from the surface of the final clarification zone. For this reason, several hydraulic-pneumatic pumps are installed in the final clarification zone to ensure the periodical lowering of the surface water level, the mixing of the contents in the final clarification basin, and the withdrawal of floating pollutants from the surface of the final clarification zone.

The above mentioned pumps are operated by a special control unit BCC-02, which is installed in the electro-box. At given time intervals, the control unit makes contact with the electromagnetic valves, and these valves start the following operations:

1. Pumping a certain volume of purified water from the final clarification zone (the volume of water is equal to the maximum designed inlet-flow into the WWTP in 5 minutes) into the outlet piping.
2. Mixing the contents in the final clarification zone by air to separate floating pollutants from floating sludge, and pumping floating pollutants out of the floating-pollutant trap in the inlet piping of the final clarification zone back into the activation basin.
3. Sedimentation of mixed floating sludge and rising of floating pollutants after the mixing of contents in the final clarification zone.
4. Withdrawal of floating pollutants from the surface of the final clarification basin into the inlet zone of the WWTP.

The operating periods of particular tasks are pre-set by the manufacturer and are optimised on the premise of the WWTP technological tests.

If, during the above-mentioned operations, waste-water flows into the WWTP, due to the fact that a certain volume of purified water is pumped out, purified water does not flow out of the WWTP. The surface level only rises and water flows out only after all cycles of surface purification in the final clarification basin are completed, and the function of this basin has been stabilized.

Time intervals of water surface purification in the final clarification basin are set according to practical needs of the WWTP. An interval of 12 or 24 hours can be set.

It is necessary to maintain the amount of sludge suspension as well as the amount of supplied oxygen to the balance load in the inlet zone. Their amounts will differ during times of full-load or of partial-load.

Any exception to the optimal parameters results in the deteriorating of outlet water quality and therefore also reduces the purifying effect of the WWTP. To avoid this, it is necessary to observe the required concentration of sludge and to ensure adequate supply of air to the process of purification. Optimal air supply into the system is supplied by an intermittent membrane air-pump.

Surplus biomass of activated sludge is pumped out using a pumping storage car-tank or some other type of pumping technology and is disposed of in accordance with pertinent regulations.

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6. Technical parameters

6.1 Basic dimensions and weights:

BIO CLEANER	BC 4	BC 8	BC 12	BC 15

Overall dimensions

Cylinder - diameter (mm)	1400	1600	1700	1900
Basic height (mm)	1600	1600	2350	2350
Usable height (mm)	1150	1200	1600	1600
Total usable volume (m3)	1.79	2.37	3.55	4.5
Unladen Weight (kg)	150	165	180	230

Inlet Zone

Usable capacity (m3)

0.5

0.6

0.9

1.1

Activation-nitrification zone

Usable capacity (m3)

1.1

1.4

2.1

2.7

Final clarification zone

Diameter (mm)	600	800	900	1000
Usable capacity (m3)	0.19	0.37	0.55	0.70
Surface of separation (m2)	0.28	0.50	0.64	0.76

6.2 Technological equipment

BIO CLEANER	BC4	BC8	BC12	BC15
Membrane pump - type	EL-S-60	EL-S-80-15	EL-S-120W	EL-S-150
Voltage rating	230 V/50 Hz	230 V/50 Hz	230 V/50 Hz	230 V/50 Hz
Rated power	60-65 W	90-95 W	120-140 W	140-160 W
Coverage - electro-box	IP 54	IP54	IP54	IP54

6.3 Hydrological data

BIO CLEANER

BC4

BC8

BC12

BC15

WWTP capacity loading

Number of persons connected	4	8	12	15
WWTP load in BOD5 (g/day)	240	480	720	900
Volume of waste water (m3/day)	0.6	1.2	1.8	2.3

Effectiveness of purification - outlet water quality*

BOD5 (mg/l)	25	25	25	25
COD (mg/l)	90	90	90	90
Dry solid matter (mg/l)	25	25	25	25

* guaranteed values designed for the planned load (material and hydraulic load may oscillate between 30 - 100 % of the capacity)

6.4 Noise level

The only source of noise in a WWTP is the membrane-air pump. For additional information concerning the noise level - see the membrane-air pump manual.

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7. Putting the WWTP into operation

7.1 Duties of an authorized seller

Authorized sellers who are trained by the WWTP manufacturer and entrusted with distribution and assembly of the WWTP are obliged to provide:
o transport
o installation
o covering of the basin
o assembly of the WWTP and its connection
o putting the WWTP into operation, testing and setting of the device
o pass the WWTP over to the customer

7.1.1 Manipulation and transport

The WWTP can be loaded on a means of transport using a high lift truck or manually. Neither binding, nor any suspension is required. The WWTP is transported on a truck or on a sidecar. When transporting, the WWTP must be fastened to ensure that it does not shift. The installation may be done manually.

7.1.2 Installation

It is possible to install the WWTP below the ground level without any further static securing under the following conditions:
o the external earth pressure load of the basin will not exceed that of loose soil &Mac179; = 1.7 t/m3, ’ = 35o,
o the basin will be installed on a reinforced flat concrete slab, 100 mm thick,
o the slab will be reinforced by a reinforcing net,
o the underground water level will be lowered below the level of the underside of footing.
The travel overload near the WWTP is not taken into consideration.
In other cases the basin must be embedded in concrete to secure additional static securing.

7.1.3 Covering of the basin, access to the basin

A removable wooden or laminate covering may be ordered. The covering must not be walked on. The WWTP covering can be also solved in a different way within the Project provided that the following conditions are followed:
1. the covering must enable the access to the entire WWTP platform
2. the covering must enable a safe access to the WWTP in accordance with valid safety regulations
3. the covering must follow valid safety regulations and ensure that nobody will fall into the basin.

In cases where the top edge of the WWTP is below the ground level, the service and common maintenance can be done without entering the basin. If the WWTP is installed deeper, the access into the basin must be solved in the Project and must follow valid safety regulations. The inner parts of the WWTP are not designed to be walked on.

7.1.4 Connection of the WWTP

The membrane air-pump is connected to the socket of the electro-box. This box comes as part of the delivery. The electro-box and the membrane-air pump must be placed inside a covered object near the WWTP (a cellar, garage). To connect this electro-box, an outlet minimum 3 x 1.5 mm2 for a CYKY cable must be prepared. For types BC 4 and 8 this cable is secured by a separated circuit breaker in the main switch-board of the object 230 V/ 1.5 A (230V/2A for types BC 12 and 15). The socket, which is part of the delivered electro-box, must be installed on a firm base (e.g. a wall).

The forced-air piping of the membrane pump is connected with the WWTP by a _“ PVC hose; this hose is laid in the same excavation pit together with the inlet waste water piping. The piping must be laid in a plastic or steel protector with a minimum diameter of 60 mm. PE hoses for the electromagnetic valves in the electro-box will be inserted in this protector as well.

The WWTP is devised to work in humid conditions and in conditions with deleterious effects in accordance with Czech Standard _SN 33 2000-3, specifically those conditions coded by the following number-letter combinations: AA 4, AA 6, AB 4, AB 6, AD 4, AF 3.

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7.1.5 Assembly instructions

The WWTP is installed on a flat concrete bottom in a pit, and thereafter levelling must be checked. The WWTP is installed in such a fashion that the detritus trap points to the waste water piping supply
inlet. Up to approx. one third of the WWTP is filled with water. The inlet hole for the incoming waste-water piping is marked and the inlet into the WWTP is created and sealed.

The membrane air-pump is installed inside a covered object, connected to the electro-box via a socket, and all the functions must then be tested. The membrane pump is connected with the air distributor via a PVC hose. A branch is installed between the air distributor and the membrane pump. This branch is connected to the electro-box via a PE hose. The remaining hydraulic-pneumatic pumps and the electro-magnetic valves are connected from the electro-box.

The outlet piping is connected to the final clarification zone of the WWTP and all the slots are tightened. Subsequently, the WWTP is gradually filled with water or with activated sludge, while simultaneously creating an envelope of saturated soil around it, afterwards checking the basin's water impermeability. The soil envelope is done in accordance with Assembly Regulations for implementing soil envelopes and laying concrete.

7.1.6 Putting into operation, testing, and setting up

On the air distributor, the amount of air-supply for the hydraulic-pneumatic pump (a mammoth) and the amount of air-supply under the detritus trap of the mechanical pre-treatment is adjusted. The mammoth of the recirculation pump is pre-set to such a rating, so that 1/3 - 1/2 of the pipe is filled with the recirculated activated mixture.

The amount of air-supply under the detritus trap must be adjusted in such a manner that a bubble appears every second. The air-supply inlet into the aeration elements is fully open.

The first thing to adjust on the control unit is to set the membrane pump to unintermittent mode using mode A - code 9 - see 8.1.3. The WWTP is regularly inspected, and the membrane pump, air-supply for particular parts as well as the quality of the purified water are checked. If necessary, the performance of the membrane pump is regulated using the control unit BCC-02.

7.1.7 Passing the WWTP to the customer

The WWTP is passed over to the customer en mass, e.g. when the technological part is installed in the basin. The membrane pump and the electro-box are delivered separately. It is also possible to deliver the technological equipment without the basin; in this case the WWTP is installed in a concrete basin, and the final clarification basin, the aeration system, and the air distributor are delivered separately

7.2 Operator's duties

The operator is obliged to ensure a suitable location for installation of the membrane pump and of the electro-box. The electro-box and the membrane pump must be installed inside a covered object near the WWTP (e.g. basement, garage, etc.) To connect this electro-box to the grid, an outlet of minimum 3 x 1.5 mm2 for a CYKY cable must be prepared. For types BC 4 and 8 this cable is secured by a separate circuit breaker in the main switch-board of the object 230 V/ 1.5 A (230 V/ 2 A for types BC 12
and 15).

Before the WWTP is put into operation, the operator is obliged to fill the WWTP with the required volume of clean water.

7.3 Putting into operation

To ensure the required quality of waste-water, it is necessary to start the biological process. This can be done in the following two ways:
1) Gradual start, the so-called volume-inflow of waste water and by permanent loading of the WWTP, even over the level of set technological parameters.
2) Supply of inoculate sludge.

In both cases the membrane air-pump and all components of the aeration and technological equipment (as well as the hydraulic-pneumatic pump) must work uninterrupted, using the appropriate control unit setting - mode A, code 9. It takes from 3 to 8 weeks to start the whole process gradually and is dependant on waste-water quality and it's temperature.

After the WWTP is broken in, the code in mode A is switched over to intermittent service. This is done based on the measurement of the level of concentration of dissolved O2 in the inlet zone and in the activation zone of the WWTP. Adjustment of the working time and intermissions depends on the actual material and hydraulic loading during a long-term monitoring of the WWTP. We recommend that monitoring should be done by an authorized seller or by the manufacturer.

Using inoculate sludge

A sample of inoculate sludge is imported from an efficient biological WWTP. The WWTP is broken-in in the following way:
1. A particular WWTP with good quality flocculating activated sludge is chosen.
2. Recent results of sludge tests are evaluated: sedimentation, undissolved material, sludge index; New tests are conducted and the above-mentioned parameters, including biological evaluation, are re- measured.
3. A cesspool age truck sucks condensed activating sludge, preferably from the recirculation piping of the final clarification basin. It is possible to take mechanically-concentrated activated sludge from the de-watering device of the WWTP in the amount of 20 - 30 kg (dry sludge approx. 25%).
4. The imported inoculate sludge is discharged into the activation zone of the basin. If mechanically concentrated sludge is used, it is necessary to dilute it with water.
5. It is important to take care that flocculates will not leak into the outlet trough when filling the basin with inoculate sludge. The final concentration of the sludge in the WWTP should be 4-5 kg/m3

Adjustment of the air-supply inlet in the WWTP

After the membrane air-pump is switched on, the air distribution mechanism must be adjusted. The adjustment is done by regulating screws on the air-distribution element. The screws for the air-supply inlet into the aeration device must be left permanently open. They may be closed only in case of a defect on a particular part of the aeration system.
Adjustment of other parts of the air distribution device:
o the aeration of the screen-bar baskets is adjusted in such a way that every second the air will aerate the basket with a big bubble;
o the air-supply inlet into the recirculation mammoth pump is adjusted in such a way that 1/3 to 1/2 of the pump pipe is filled with a recirculated activated mixture.

7.4 Shut-down and re-starting into operation

Short-term intermission of the inflow into the WWTP will not disturb its' operation. If the inflow is interrupted for a longer period of time (more than 3 weeks) - e.g. during the holidays - it is necessary to shut down the WWTP or to dose a substitute organic liquid extract. At the time of a shut-down, it is advisable to interrupt the operation of the membrane-air pump often.

Shut-down of the WWTP

The contents of the WWTP are sucked out and the WWTP is cleaned (e.g. in case of seasonal work). Thereafter, the WWTP is filled with clean water.

Putting into operation

The WWTP is passed over to the operator as a serviceable unit. The installation and assembly of the WWTP is done by an authorized person who was trained by the manufacturer. Putting into operation is done in accordance with section No. 7.3 of these operational instructions.

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8. Supervision and maintenance of the WWTP

8.1 Duties of the operator

8.1.1 Basic facts
The owner of the WWTP (the operator) is responsible for the quality of water which is discharged into a recipient. For this reason the operator is obliged to supervise the operation of the WWTP and to maintain it. Particular operations are done in accordance with this Service Manual (Operational Instructions). The operator orders technological inspection of the WWTP at a service organization approved by the manufacturer.
The basic supervision of the WWTP done by the operator involves the following steps:
- regular cleaning of the detritus trap (the screen-bar basket)
- inspection of the membrane-air pump; cleaning, possibly washing of the filter
- inspection of the mammoth for recirculation of activated mixture
- monitoring of concentration of activated sludge
- inspection of the mechanical-pollutant trap aeration
- inspection of the aeration of the activation zone
- inspection of the mixing process in the final clarification basin
- checking the amount of dissolved O2 in the inlet zone and in the activation zone of the WWTP (the inlet zone - 0 - 0.6 mg O2/l, activation zone 1.5 - 4 mg O2/l)

The WWTP must be operated and maintained throughout the year and an overall inspection must be performed at least twice a week. It is especially vital to check the membrane air-pump, clean the screen-bar basket, remove floating pollutants from the surface, and check and clean the floating-pollutant trap in the final clarification zone. Once a month, the construction of the WWTP and the technological equipment shall be inspected. The winter safety maintenance should be performed well in advance (maintenance, sludge disposal, preparation of gadgets for winter).

To ensure faultless operation of the WWTP the following substances should be avoided in the inlet:
- higher concentration of fat
- regenerative solutions from home softening agents
- colours, lacquers, diluters
- strong antiseptics, strong acids and alkalis

It is advisable to avoid the following mechanically and biologically undecomposable pollutants (to reduce the frequency of cleaning the detritus trap):
- plastic products
- rubber products
- textiles

8.1.2 Operating the WWTP

The WWTP is operated from the electro-box where the control unit is installed. Using mode A (see 8.1.3.) this control unit sets the membrane air-pump into permanent work mode. Work of the membrane air-pump and of the entire aerating system, as well as the electricity supply to the WWTP can be disconnected by a current protector.

8.1.3 Control Unit BCC-02

To carry out its functions, Control Unit BCC-02 has two working modes:
- Operating mode,
- Set mode.
The function of the unit in operating mode is among others related to a built-in clock. The running of the clock is backed up by a replaceable lithium battery, type CR2032 with life up to 20 years. The condition of the battery is continuously monitored, and when it is weak, the Control Unit displays a warning message.
The BCC-02 unit is intended to be installed in a switchboard box. During a usual installation, the terminals of the unit are covered by the switchboard, only the front of the unit, the controls, and indicating elements are accessible through a gap in the switchboard.

The connection of the unit to a 230 V/50 Hz single-phase circuit and to device switches (through switch terminals KA1 to KA4) is illustrated in the picture. Controlled functions are assigned to relay terminals and to related screwing terminals as follows:
KA1 X1/1, X1/2 aeration activation
KA2 X1/5, X1/6 draw of clean water from the settling - compartment to the drain
KA3 X1/7, X1/8 settling compartment mixing
KA4 X1/9, X1/10 draw-off from the surface of the settling compartment

The circuit fuse location is also indicated in the picture. The fuse can be replaced after disconnecting the circuit and removing the fuse's cover.

Operating mode

The operating mode is the normal functioning mode of the BCC-02 unit. The unit is always in the operating mode after connecting to the circuit or when the set mode is finished. The operating mode is indicated by displaying time constants C1 to C6 in progress in the first two positions of the four-digit display and the number of minutes remaining to its completion (minutes countdown). These time intervals (periods) and their successions are important for the function in the operating mode:
C1 aeration period
C2 aeration interruption period

The succession of intervals C1 and C2 is repeated cyclically.

C3 cleaned water draw-off period
C4 the period of settling compartment mixing and simultaneous draw-off of floating substances
C5 delay between mixing and second draw-off of floating substances
C6 second draw-off of floating substances

Succession of linked intervals C3 to C6 is repeated in 12 or 24-hour periods.

Set mode

The function of individual buttons in the set mode:
MODE …….. successively offers modes P1, P2, P3, START, TIME, Operating mode
+, - ………… change of set parameters, completion of period C3-C6 in START mode
SET ………… confirmation of selected mode or value of set parameter

A change of the unit's parameters is executed from the control panel in modes P1 to P3. A brief push of the MODE button indicates P1 mode, and each following brief push changes the mode offer in the sequence of P2, P3, START, TIME, Operating mode, P1, P2, ... and around again. Together with the mode, the set value of the parameter is displayed at the 3rd and 4th position of the display. To select the currently displayed mode, push the SET button.
The value of the parameter of the selected mode starts to flash and you can change the value with the “- “ or “+” buttons. Always confirm the new value of the parameter by pushing the SET button. ´This concludes a change of parameters and you can either leave the unit as is (after 30 seconds of inactivity the unit switches back to “Operating mode”) or continue setting by pushing the MODE button.

P1 Mode
In the P1 mode select a pair of time intervals C1 and C2 by selecting codes 0 to 9 according to the following table, which is part of an operating program.

CODE	C1 [min]	C2 [min]
0	10	120
1	10	30
2	10	20
3	10	15
4	10	10
5	15	10
6	20	10
7	30	10
8	40	10
9	60	5

P2 Mode
In the P2 mode, time data is entered in 1-hour increments, which determine when the first following sequence of intervals C3, C4, C5, C6 starts to be executed.

P3 Mode
In the P3 mode, determine how many times a day the sequence of intervals C3, C4, C5, C6 is repeated, as follows:
CODE PERIOD [hours]
24 24 (once a day)
12 12 (twice a day)

START Mode
The START mode immediately begins the sequence of intervals C3, C4, C5, C6. Displaying C3 to C6 on the LED display successively indicates the intervals. Each interval C3, C4, C5 or C6 in progress can be stopped by pushing the “+” button and in case of C3, C4 a C5 a following interval will automatically continue. After the period C6 or after its premature conclusion by pushing the “+” button, the unit BCC-02 will switch back to “Operating mode”. You can end execution of the sequence at any time by pushing the “-“ button.

TIME Mode
In the TIME mode, you can correct the time on the clock of the unit. It is recommended to check the time once a year in the TIME mode and to correct any possible inaccuracy by pushing SET and “-“, “+” buttons.

Connection to a PC
The BCC-02 unit can also be set by a connected PC (notebook) through an RS232 interface by MOSTCOM. In this way you can also set some special parameters that you cannot access from the keyboard of the unit. You can also download a history of operation of the unit from its' archive. The unit is completely set by the manufacturer in advance, and potential changes are provided by the manufacturer or authorized dealer.

8.1.4 Adjustment of air supply to the WWTP

Air supply to the WWTP is adjusted by the cocks on the air distributor. The cocks on the inlet piping of the aeration system must be left open all the time. They may be closed only if there is a defect in a particular section of the aeration system (provided that the system is divided into sections).

Adjustment of other parts of the air distributor:
o setting of the aeration of the screen-bar baskets is done in such a way that every second the air will aerate the basket by a big bubble;
o the inlet into the aerating elements of the inlet zone is adjusted in such a way that the contents of the zone are mixed;
o the air inlet into the recirculation mammoth pump is adjusted in such a way that 1/3 to 1/2 of the pump pipe is filled with the recirculated activated mixture.

8.1.5 Inspection and maintenance of the WWTP - summary of activities

Interval

Activity

Daily	Weekly	Monthly	I/2 year	Yearly	Other
*						visual inspection of the WWTP and of the control unit board - see 8.1.5.1
	*					inspection and cleaning of the screen-bar basket - see 8.1.5.2
	*					inspection of surface and of water pollution in the final clarification zone - see 8.1.5.3
	*					inspection of the mammoth and air supply under the basket - see 8.1.5.4
	*					inspection and cleaning of the floating-pollutant trap in the final clarification zone - see 8.1.5.5
	*					inspection of the aeration system - see 8.1.5.6
	*					inspection of surface mixing operation in the final clarification zone - see 8.1.5.7
	*					inspection of the membrane air-pump - see 8.1.5.8

8.1.5.1 Visual inspection of the WWTP and of the control unit

We check visually if the air-supply to the WWTP works properly, e.g. if the activation zone is being bubbled through. We check if the diode „POWER“ lights up on the display of the control unit; the diode ERROR must not appear. In case of a defect the manufacturer or an authorized dealer must be contacted.

8.1.5.2 Inspection and cleaning of the screen-bar basket

The screen-bar basket catches coarse pollutants and paper is pulverised there. The basket must be checked twice a week and biologically non-degradable materials (plastic, rubber, textile) must be removed. The materials caught in the basket must be stored in a container, and if stored for a longer period of time, it is necessary to use for example a bleaching lime to ensure their hygienic harmlessness. At the same time, air supply for aerating the basket must also be checked.

When checking the screen-bar basket, first check the intensity of aeration; if necessary, the intensity is adjusted in accordance with 8.1.4. Thereafter, it is necessary to push the basket out of the guide-rails and check the amount of caught materials. When cleaning the basket, the inflow into the WWTP must be stopped. The materials in the basket must be stored in a container, and if stored for a longer period of time, it is necessary to use for example a bleaching lime to ensure their hygienic harmlessness.

Depending on the method how the WWTP is installed, the basket can be manipulated in the following ways:
a) without entering the basin of the WWTP (the basket can be reached from the edge of the basin)
b) entering the basin - if the WWTP is installed below ground level. In this case, a safe entry into the WWTP must be secured.

8.1.5.3 Inspection of the water surface and of water quality in the final clarification zone

Water quality and water surface are checked visually. If we find pollutants or if there is an excessive amount of flotative sludge, we will perform a check of the periodical removal of flotative sludge and floating pollutants function. - see 8.1.5.5. Pollutants on the surface must be removed. At the same time the floating-pollutant trap must be checked and cleaned - see 8.1.5.5.

8.1.5.4 Inspection of the mammoth and of air supply under the basket

The mammoth and air supply under the basket are checked visually in accordance with information in 8.1.4, if necessary, re-setting is done.

8.1.5.5 Inspection and cleaning of the floating-pollutant trap in the final clarification system

The floating-pollutant trap is checked and cleaned when checking the water surface and water quality.

Warning: Materials removed from the water surface of the final clarification zone (with the exception of the flotative sludge) and materials removed from the floating pollutant trap must be stored in a container, and if stored for a longer period of time, it is necessary to use for example a bleaching lime to ensure their hygienic harmlessness.

8.1.5.6 Inspection of the aerating system

A visual check is done to see if the aerating system steadily bubbles the water surface through. Any sudden change of the intensity must be consulted with the manufacturer or with an authorized dealer.

8.1.5.7 Inspection of the mixing process of the water surface in the final clarification zone

By switching the control unit into mode P and by selecting the interval C4 (see 8.1.3) the hydraulic-pneumatic pump is checked visually. If the water surface is not mixed, it is necessary to contact the manufacturer or an authorized dealer.

8.1.5.8 Inspection of the membrane-air pump

Maximum temperature allowable of the membrane air-pump is 80oC; if a higher temperature registers, it is necessary to contact the manufacturer or an authorized dealer.

8.1.5.9 Testing sludge concentration

Production of activated sludge depends primarily on the inlet loading of the WWTP and on other parameters (sludge age, etc.). If laboratory tests (giving the exact information about sludge concentration) of the dried sludge are not available, it is possible to estimate the amount of sludge by a sedimentation test in a graduated cylinder. In a sample of approx. a litre of activate sludge, the sludge level in a graduated cylinder is measured after approx. 30 minutes of sedimentation. If the sludge level is higher than 70% of the mixture column, de-sludging must be performed - see 8.1.5.10.

8.1.5.10 Pumping of sludge

The operator of the WWTP is responsible for sludge disposal. Sludge disposal must be performed in accordance with valid legal regulations concerning waste-materials treatment.

When sludge is aerobically stabilised, no further decomposing processes continues. Therefore no sensorial faults appear, and it is possible to use this sludge in agriculture. The transport of it is done on a contract basis.

How to de-sludge:

1. Interrupt operations in the WWTP by switching the current protector off; use the safety plate to indicate that the WWTP was switched off.
2. Put the end-pipe of the cesspoolage truck or of another pumping mechanism into the inlet zone; do not damage the technological equipment of the WWTP.
3. Pump off approx. 1/2 of the volume of the WWTP.
4. Remove the end-pipe of the cesspool age truck or of another pumping mechanism from the inlet zone.
5. Supply clean water into the WWTP.
6. Remove the safety plate and put the WWTP into operation.

8.1.5.11 General maintenance and cleaning of the reactor

Having pumped out and cleaned the reactor, check the construction of the WWTP. If there are any doubts, contact the manufacturer or an authorized dealer.

8.1.5.12 Tests of the amount of dissolved O2

Concentration of dissolved O2 provides information whether the technological process has optimal conditions. Tests should be done if there appear technological faults when operating the WWTP. Tests should be done by the manufacturer or by an authorized dealer. The optimum amount of O2 in the inlet zone is 0 to 0.6 mg/l and in the activation zone 1 to 2.5 mg/l. The test must be done by an oximeter when the WWTP is turned on.

8.1.13 Sampling

Sampling frequency must correspond to the requirements of an authorized water-managing authority. The instructions for sampling are given in chapter 9.

8.1.6 Instruments and tools for operating the WWTP

1. A bathing thermometer
2. PVC bottles (1 litre capacity with a wide bottleneck) - 2 pieces
3. A brush on a stick
4. A vessel for sampling
5. Protective gloves
6. A shovel
7. A ladle for ladling the activated sludge

8.2 Operation journal

Any operations in the WWTP as well as maintenance and inspections must be recorded in an „Operation journal of the WWTP“. Any manipulations in the WWTP, breakdowns, failures must be written down in this journal, e. g. :
o date
o hour
o temperature of the activated mixture
o amount of recirculated sludge in the inlet zone
o mammoth
o membrane air-pump
o amount of air-supply coming into the process
o amount of excessive sludge that was pumped out
o amount of transported sludge; place of storage or place of disposal
o amount of rakings, their transport and disposal
o concentration of dissolved O2 in the inlet zone and in the activating zone of the WWTP
o consumption of electric energy
o note (maintenance done, results of chemical tests, inspection)
o abnormalities (changes in the duration of aeration, shut-down of the WWTP, etc.)
o breakdowns, failures (power cut, failure of the compressor, etc.)

An authorized water-managing authority, the producer of the WWTP and an authorized dealer are entitled to demand that the operator present the „Operation Journal of the WWTP“.

8.3 Instructions in case of defects and failures of the WWTP

8.3.1 Most frequent defects and failures of the WWTP

A defect of the WWTP can result in a shut-down of the WWTP or in a long-term / short-term worsening of the purifying effect.

Defects that result in immediate shut-down of the WWTP (functional faults) are signalled on the display of the control unit or by a safety light in the electro-box.

Defects that result in a long-term or in a short-term worsening of the purifying effect (technological failures) are indicated by worsening of the quality of out-flowing water, by increased sludge concentration, by sludge flotation, etc. These failures usually follow a violation of some of the basic conditions for the biological process of waste-water treatment. When using the principle of biological waste-water treatment biomass in suspension, pollution in waste-water is broken down using micro-organisms. The amount of activated sludge must correspond to the amount of in-flowing waste. The activation mixture must permanently contain dissolved oxygen so that micro-organisms can live. In-flowing waste-water must be permanently mixed with the activated sludge which provides sufficient amount of nutriments for the micro-organisms. The sludge must be kept in suspension.

8.3.2 Functional faults - overview

DESCRIPTION OF THE FAULT	CAUSE OF FAULT	REPAIRING
Error message of the control unit	See. 8.3.2.1	See 8.3.2.1
Signalling of the membrane air- pump failure	failure of the membrane air-pump	See. 8.3.2.2
Sudden visual change of the outflowing water	the inflow of waste-water into the WWTP was interrupted	The cause must be found. This failure can be caused by clogging or by a failure of the sewerage piping. The failure must be repaired and waste-water must be prevented from flowing into the recipient or into other areas where it could cause damage.
	excessive inflow into the WWTP	It is necessary to find out if any extraneous water (groundwater, rainwater) gets to the sewerage: if yes, it must be stopped.
	see: error message and signalling or failure in the electro-box

8.3.2.1 Error message of the control unit

The POWER indicator diode does not light up

Supply voltage 230 V/50 Hz is not delivered into the unit BCC-02 or the in-built tube fuse F50 mA is damaged. The fuse must be changed.

The decimal point does not flash

The unit BCC-02 does not work, it is does not perform control functions. Follow these instructions provided that the fault is indicated:
a/ Switch off and after 5 seconds again switch on the supply voltage. If the decimal point does not stop flashing within one minute, the BCC-02 unit works properly.
b/ If the decimal point stops flashing within on minute, remove the front panel, do not switch off the supply voltage and insert a lithium cell CR 2032 in the holder or replace the existing cell with a new one. If the decimal point starts flashing, the unit works properly.
c/ If the decimal still does not flash, switch the supply voltage off and request a service repair.

The ERROR indicator diode is displayed

The real-time clock does not show reliable information. Follow these instructions:
a/ Remove the front panel and replace the lithium cell CR 2032 with a new one (not if this was done shortly before - see the previous paragraph b).
b/ Switch the supply voltage off, after 30 seconds press all three buttons and switch the supply voltage on. Release the buttons after E1 appears on the display.
c/ Again repeat this procedure of switching off and on, following the instructions in paragraph b).
d/ If the ERROR diode does not light up the display, it is possible to adjust the real-time clock. Leave the unit BCC-02 switched on and make a temporary adjustment at midday the following day (follow the instructions of b)). The BCC-02 clock will be set to 12:00, January 1st , 2000. Ask for exact readjustment during the service inspection.
e/ If the ERROR diode is still on, leave the unit BCC-02 on and request for a service repair.

Message E2 is blinking on the display

If E2 is blinking on the display, it signals errors of inner communication in BCC-02. Switch the supply voltage off and switch it on again after 5 seconds. If E2 appears again on the display blinking, it is necessary to request a service repair. Before the message E2 is displayed, detailed identification of the error in the shape of Enumber should be noted.

8.3.2.2 Signalling of the membrane air-pump defect

There is an external signalling mechanism which signals a defect of the membrane air-pump (the light is on). In this case it is necessary to contact the manufacturer or an authorized dealer.

8.3.3 Technological defects

The following technological defects may result in a short-term or long-term worsening of the quality of the waste-water treatment process. These problems should be resolved in co-operation with a specialist.

Low concentration of activated sludge

This problem frequently appears when the biological process is being broken in or when a larger amount of excessive sludge is pumped out. Usually this is accompanied by foaming on the surface.

Excessive amount of sludge in the process of waste-water treatment

Every day, waste-water treatment results in a rising of the amount of sludge. The increase depends on the amount of biodegraded pollution. The higher the amount of biodegraded waste, the higher the volume of sludge in the process of waste-water treatment. If a certain level is exceeded, flocs leak out from the final clarification system into the outlet. It is necessary to reduce the volume of sludge concentration by pumping it out.

Shortage of oxygen

Shortage of oxygen in the biological reactor of a house waste-water treatment plant can be caused by the following defects:

- a defect of the membrane air-pump or electro-device
- clogging of aerating elements
- power failure
- excessive amount of in-flowing pollutants
- high concentration of sludge in the process of waste-water treatment
- insufficient running time of the membrane-air pump due to a wrong setting on the control unit

Excessive amount of oxygen

An excessive amount of oxygen in the process of waste-water treatment can result in an uneconomical operation of the WWTP, in flocs leaking into out-flowing water, or in foaming in the biological stage. This defect can be corrected by optimizing the amount of air supply into the process - by using intermittent working cycles of the compressor, using the control unit.

Thick sludge layer on the water surface

Probable causes:
- the mammoth pump for sludge recirculation is out of order or its performance is insufficient
- excessive or insufficient amount of oxygen in the process - this failure can be corrected by a change in the working cycle of the membrane air-pump
- great amount of sludge in the process of waste-water treatment - this failure can be corrected by reducing sludge concentration by pumping the sludge out
- excessive amount of floated sludge in the final clarification zone - it is necessary to check the aeration system and to check the withdrawal in the final clarification zone
- control unit defect - the failure is corrected by switching the main circuit breaker off and on. The control unit programme starts to function again.

Flocs leakage into the discharge trough in the final clarification zone

Probable causes:
- excessive amount of sludge in the process of waste-water treatment - sludge is pumped out from the process
- high sludge index - a specialist (a technologist) should be consulted
- the biological reactor is hydraulically overloaded - sludge concentration is reduced by pumping a certain amount of sludge out
- the mammoth pump for sludge recirculation is out of order, or its' performance is insufficient

Sludge in the graduated cylinder does not sediment

This fact indicates a serious technological problem in the process of waste-water treatment and must always be consulted with a specialist - a technologist.

Probable causes:
o high sludge index
o inflow of a toxic substance into the process
o insufficient amount of oxygen in the process of waste-water treatment

8.3.4 Activities of the operator that may lead to a violation of warranted duties:

o deliberate damage of the technological device or construction of the WWTP
o deliberate putting of the technological parts or machinery out of order (e.g. the membrane-air pump)
o re-setting the aerating working cycle
o removing the safety components (e.g. coverage of the WWTP)
o not operating the WWTP in accordance with the manufacturer's instructions (Operational Instructions)

It is forbidden to:

o manipulate any components of electric installation under voltage
o to handle the membrane air-pump without disconnecting it first from the electrical network
o deliberately stop, switch off and switch on the membrane air-pump
o to pump the sludge from the process of waste-water treatment irresponsibly

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9. Inspection of the parameters of the WWTP

Accredited laboratories provide tests and analysis of waste-water samples on the basis of a valid water-management resolution. The number of qualitative indexes and their frequency is given in the resolution.

The WWTP usually goes through a year-long trial operation. The water-management authority evaluates the operation of the WWTP on the basis of the presented tests and analysis. If the qualitative indexes are not in contradiction with the required values, the WWTP is put into permanent operation. If the qualitative indexes are in contradiction with the required values, a remedy is proposed.

Sampling, lab tests

Inspection of the process of water-waste treatment involves: a technological inspection (performed in the WWTP itself) and a chemical analysis of basic indexes (performed in a laboratory). The list of monitored indicators of pollution and frequency of sampling is stipulated by an authorized water-management authority. The inspection of the WWTP involves:
o test of sludge volume concentration
o measuring of the amount of excessive sludge that was pumped out
o measuring of the amount of purified waste-water
o measuring of the temperature of the activating mixture

The quality of waste-water which flows into the recipient must monitored in accordance with the Czech Standard 757241 Inspection of Waste-waters and Special Waters. To evaluate the technological process of waste-water treatment, it is necessary to monitor the quality of in-flowing water, as well as the quality of out-flowing water.

Sampling for performing the water quality test is done minimally for 8 hours by pouring 1 litre of sample water into a PVC bottle at one-hour intervals. After the sampling is finished, the homogenized samples are mixed and 1 litre is taken into the chemical laboratory to be analyzed. The samples are kept in a cool place, protected from sunshine and warmth, preferably in a fridge.

The amount of purified water can be checked either by installing a measuring structure at the outlet of the WWTP or by filling the WWTP up to a certain capacity. The amount of excessive sludge is measured simultaneously when the process of de-sludging is being realized.

The optimal place for sampling and monitoring of the quality of purified water is the area between the underflow baffle and the outlet piping. Sampling is done using a 1 litre PVC bottle which is fastened to a stick of about 1.5 m in length.

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10. Safety and hygiene at work

The contents of this chapter cannot cover all the areas and potential problems that could surface during the operation of a WWTP and resulting from all valid standards, regulations and provisions. Particular chapters of this Service Manual resolve some of the problems concerning safety at work and hygiene.

When operating a WWTP, provisions of the following standards and regulations must be followed:

- Law No. 22/1997 Col., in the wording of later regularizations and amendments about technical requirements on products
- Regulation of the Government No. 168/1997 Col., which states technical requirements on L.V. electric devices
- Regulation of the Government No. 169/1997 Col., which states technical requirements on electro-magnetic compatibility of products
- Regulation of the Government No. 170/1997 Col., in the wording of later regularizations and amendments about technical requirements on the machinery
- Regulation of the Government No.178/1997 Col. in the wording of later regularizations and amendments, which states technical requirements on products in civil engineering
- Czech Standard CSN EN 292-2 Safety of Machinery. Basic terms, general rules for projection. Part 2: Technical principles and specifications
- Czech Standard CSN EN 50081-1 Electro-magnetic compatibility - General standard concerning radiation. Part 1: Residential buildings, business premises, premises for light industry
- Czech Standard CSN EN 50082-1 Electro-magnetic compatibility - General standard concerning radiation. Part 1: Residential buildings, business premises, premises for light industry
- _SN EN 60335-1 Safety of electric appliances for households and similar purposes. Part 1: General requirements

10.1 General requirements on safety at work

A WWTP operator must follow valid regulations concerning safety at work and adapt them to specific conditions of his work-place. General regulations are published in booklets “Instructions concerning safety and health protection at work in a water-managing plant” (volume 1- common instructions, volume 2 - sewerage).

The area of the WWTP shall be properly safeguarded. Children are forbidden to enter the area. Only persons over 18 years may operate the WWTP.

10.2 Accident protection

The operator shall follow safety, health and hygienic regulations within a necessary range and conduct in such a way so as not to endanger his own health, life or that of another person. The operator shall use the necessary tools and instruments. The surfaces of the WWTP shall be treated appropriately so as not to be slippery, and shall be kept clean and in perfect order. Icing shall be removed from icy places or scattering shall be provided. Electric devices shall be protected against any unprofessional handling.

The operator is forbidden to enter the basin of the WWTP.

If it is necessary to enter the basin, safety regulations shall be followed; these regulations are stipulated by the designer and are stated in the supplement to this Manual (Operational Instructions). The supplement shall be prepared individually in co-operation with the designer.

Protection against injuries by an electric current

The operator (an advised person) may operate such electric devices where he cannot get into contact with uncovered parts of electric wires and with devices that are under voltage. Being disconnected from the grid, he may shift movable electrical appliances, electric service leads, change blown fillers of screw fuses, bulbs and perform regular repairs. If a defect is detected, he shall immediately disconnect the electrical device from the grid and shall have it repaired by a specialist.

The WTTP operator should be familiar with the following standards concerning injuries by an electric current:

- Czech Standard CSN 34 3100 Electrotechnical regulations for operating electric devices.
- Czech Standard Electrotechnical regulations. Safety regulations for operating electric devices and switchboards.
- Czech Standard CSN 34 3108 Electrotechnical regulations. Safety regulations for operating electrical devices by an advised person.

Health care, infection protection

Operating a WWTP bears health risks when handling waste-water, sludge, rakings, protective aids, tools and instruments, etc. Therefore, it is essential that the operator uses protective aids, adheres to the rules of work hygiene, as well as personal hygiene.

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10.3 Summary of selected regulations and technical standards

- Law No. 258/2000 Col., of public health care
- Law No. 254/2001 Col., of water (water law)
- Governmental order No. 61/2003 Col., which stipulates indicators of permissible level of water pollution
- Law No. 185/2001 Col., of waste materials
- Guideline MLVH CSR No. 280/V/TPO/86, Sewerage system of 25th August 1986 for projecting sewerage piping system
- Regulation No. 502/2000 Col., of health protection against adverse effects of noise and vibrations
- Direction of the Ministry of Agriculture - of the supreme hygienic officer of the Czech Republic No. 42/1977 Sanitary regulations that state the method for measuring and evaluating noise levels and ultrasound in a working environment
- Czech Standard CSN ISO 3864 Safety colours and safety signs
- Czech Standard CSN 33 2000-5-51 Electrotechnical regulations - Electrical devices - Part 5: Selection and construction of electrical devices - Chapter 51: General regulations
- Czech Standard CSN 33 2000-5-54 Electrotechnical regulations. Part 5: Selection and construction of electrical devices - Chapter 54: Ground connection and protective conductors
- Czech Standard CSN 33 2000-4-41 Electrotechnical regulations - Electrical devices - Part 4: Safety - Chapter 41: Protection against injuries by electric current
- Czech Standard CSN 73 6510 Water service. Basic terminology
- Czech Standard CSN 73 6760 Sanitary plumbing
- Czech Standard CSN 75 0905 Testing water impermeability of water-supply and sewerage facilities
- Czech Standard CSN 75 6402 Waste-water treatment plants for less than 500 equivalent residents
- Czech Standard CSN 75 6551 Treatment of waste-water with oil substances
- Czech Standard CSN 75 6601 Technological machinery of waste-water treatment plants
- Czech Standard CSN 75 7220 Water quality. Testing surface-water quality
- Czech Standard CSN 75 7241 Testing waste-water and special water

11. List of accompanying project documentation

The following accompanying project documentation is delivered together with the WWTP:

- Service Manual (Operational Instructions), Operation Journal
- A chart of compressed air distribution - a separate supplement to the Service Manual
- A chart of controlling air distribution - a separate supplement to the Service Manual
- A chart of connection of electric devices - a separate supplement to the Service Manual
- A chart of operating elements of the electro-box - a separate supplement to the Service Manual
- Instructions for installation of the WWTP - a separate supplement to the Service Manual
- Service book (certificate of warranty, audit report of the electrical device, list of spare parts, list of business partners)
- Documentation of the membrane air-pump - a separate supplement to the Service Manual
- Record of water impermeability of the basin (if a plastic basin is delivered)
- Assembly instructions for implementing soil envelopes and laying of concrete

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