Domestic waste water treatment plants

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Models of waste water treatment stations:

^*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:

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

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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