Domestic waste water treatment plants

Designation Operation concept Advantages

Models of waste water treatment stations:

Model

Capacity, m3/day

Number of inhabitants

Dimensions, l/w/h*,
m

Пво-тв-50-б

50

Up to 230

6х3х5.2

Пво-тв-65-б

65

Up to 300

6х3х5.2

Пво-тв-100-б

100

Up to 460

6х6х5.8

Пво-тв-150-б

150

Up to 700

12х6х5.8

Пво-тв-200-б

200

Up to 950

12х6х5.8

Пво-тв-300-б

300

Up to 1 400

12х9х5.8

Пво-тв-400-б

400

Up to 1 850

12х9х5.8

*overall dimensions are indicative ones and shall be adjusted at the design stage.

 

 

 

 

Designation of domestic waste water treatment.

Waste water treatment stations пво-тв-б are designed for complete biological treatment of domestic waste waters or industrial waste waters with similar composition. Waste water biological treatment stations of пво-тв-б type are of modular design and manufactured in ready for operation status. The station is mounted on a concrete foundation. Separate waste water treatment units are tied-in and form a winterized building in which all items and facilities required for waste water treatment are installed. This structure has an adequate thermal insulation and is user-friendly for cold weather operation. Construction and installation works may be done as soon as possible since critical process equipment and tanks are delivered as modular metal structures ready for operation after complete shop prefabrication. The manufacturing factory conducts a fit-up assembly test with subsequent disassembling and packaging depending on transport conditions. Installation work in-situ includes restoration of inter-connections of portacabins, process pipelines and electric cables.

Operation concept.

Distinctive features and technical description of waste water treatment station:

- the station is equipped with state-of-the-art process and tank equipment (including a surge tank), heat, ventilation and lighting systems and is supplied ready for operation.

- overall dimensions of modules are in compliance with specifications pertaining to stowage and securing of cargos transported by rail and road vehicles.

- only a foundation shall be constructed and off-site utilities shall be arranged since the station is supplied ready for operation.

- the station uses the diagram of multistage integrated biological treatment of domestic waste waters and waste waters of similar composition combined with denitrification, advanced treatment in a bioreactor with immobilized micro-flora and uv disinfection. The pfd ensures compliance with treatment quality requirements set to waste waters discharged into basins of high commercial fishing importance.

Composition of waste water treatment station пво-тв-б

- modular industrial building with utility systems (heating, lighting, ventilation);
- preliminary mechanical waste water treatment assembly;
- surge/distribution tank;
- aeration tanks;
- secondary settling tank;
- advanced treatment bioreactor;
- sludge dewatering assembly (surplus activated sludge);
- treated waste water disinfection assembly;
- automated control system, instrumentation set;
- reagent preparation and dozing units;
- compressor and pumping equipment, piping and control/shut-off valves package.
 
станция очистки сточных водочистка хозяйственных сточных водочистка хозяйственно бытовых сточных вод
 

Aerobic purification of produced sludge is provided for at the station. Depending on quantitative and qualitative composition of incoming waste waters the station may by additionally equipped with a bio-membrane reactor. A sludge dewatering assembly is provided for.

Operation conditions of stations of пво-тв-б type

These stations are intended for operation in the climatic zones with:
- design ambient temperatures - up to -60o с;
- wind pressure - up to 100kg•f/m2;
- seismicity - up to 9 points;
- degree of fire resistance of building— not lower than iii as per snip 21-01-97*;
- building criticality rating — ii as per gost 27751-88 with rev.no.1;
- class of structural fire hazard of building — c1;
- functional fire hazard class — ф. 5.1;
- class of building on explosion and fire hazard – д;
- power supply category - ii as per electrical installation code, the 7-th edition.

Advantages of domestic waste water treatments stations:

  • Modular configuration in full factory operational readiness;
  • Multistage advanced biological treatment system;
  • Cold weather operation;
  • Decrease in contaminant concentration based on bod – up to 15-20 mg/l.

 

Waste water treatment quality indicators

Item no.

Treated waste water quality indicators

Uom

Concentration of contaminants in treated waste waters

Prior to treatment

After treatment

Mpc

1

Odor

Points

 

Max.2

Max.2

2

Color

-

 

N/a

N/a

3

Floating matters

-

 

N/a

N/a

4

Ph

Ph

6.5-8.5

6.5-8.5

6.5-8.5

5

Bod total

Mg02/l

250

Max. 3

Max. 3 (or +0.75 to background)

6

Suspended matters

Mg/l

220

3

3

7

Nh4

Mg/l

30

0.5

0.5

8

Nitrate nitrogen

Mg/l

 

7.7

9.1

9

Nitrite nitrogen

Mg/l

 

0.02

0.08

10

Phosphates (based on phosphorus)

Mg/l

10

0.2

0.2

11

Total iron

Mg/l

 

0.1

0.1

12

Synthetic surfactants

Mg/l

 

0.5

0.5

13

Oil products

Mg/l

 

0.05

0.05

Background. Distinctive features of waste water treatment.

Domestic waste water treatment is a difficult task which fails to be accomplished with the use only one filtering element. The challenge can be met using integrated systems which provide the required reduction in concentrations of salts and other contaminants in spent water. The most dangerous substances released to environment together with water are wastes produced by the refinery industry, fats and heavy metal salts insoluble in water. The composition of abovementioned substances in process waste waters is subject to strict regulations. Spc promvodochistka ltd offers filters to be installed at any enterprise for the purpose of treating waste waters.

Filters for domestic waste water treatment are divided into several categories depending on the function performed:

  • Biological filters;
  • Mechanical filters;
  • Chemical and physical and chemical filters.

Sewage treatment tanks are the simplest and cheapest units for effluent treatment. These are containers filled with an active septic substance. Water treatment efficiency of this type of filter is about 75%. Water treated with the help of this filter remains dangerous since chemical and biological contaminant concentrations in it still are high. State-of-the-art waste water treatment facilities are used today in an integrated manner. For this purpose various combinations of mechanical, chemical and biological filters are implemented at enterprises with filters installed in sequential order in one and the same system. Oil separators, fat sensitive filters, septic tanks, aerators, etc. Are utilized as additional modules. All types of domestic waste water treatment plants indicated above are installed by spc promvodochistka ltd skilled employees in the established sequential order to achieve the treatment quality specified in appropriate quality standards, snips and gosts. Filters for each enterprise are selected according to its particular needs. Strainers are most widely used filters. They are easy to operate and maintain and are reliable ones due to their simple and robust design. Ultrafiltration systems allow for obtaining high quality treated water with the help of membranes with pores of 0.1 to 0.01µm size. Such systems are capable of retaining all solid particles.

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