Driftwood cleaning system - Sewerage

Under the Sewerage understand the system of sanitation facilities for collection, removal and disposal of wastewater.
The sewage network consists of series-connected intra, house, street, town tubes through which wastewater is discharged to wastewater treatment plants. After cleaning and disinfection of waste water down into water bodies.
There are several types of sewage: 1) the fecal-economic, which fused urine, faeces and waste water generated from domestic human activities; 2) industrial, which fused industrial wastewater; 3) storm, by which atmospheric water raft.
Each type of sewage can exist separately or combined them. Depending on this, there are separate and combined sewers. Combined calculated on reception of faecal-economic, industrial waste and atmospheric water, made by the unified system of pipes. Separate Sewerage system consists of two separate pipe for discharge of sewage and household effluents and atmospheric water. The advantage of a combined Sewerage system is that it eliminates the release into water of untreated storm water within the city limits. The disadvantages it is cumbersome treatment facilities (large-diameter pipes) and insufficient throughput showers.
Sewage devices in homes are the receivers of sewage: toilets, kitchen sinks, washbasins, bathtubs, etc. Sewage from toilets are flushed, the process of dissolving the tap water and come together with other liquid waste in underground pipes, which are transported outside the locality to wastewater treatment plants (Fig. 11).

domestic sewage
Fig. 11. Domestic sewage.

Wastewater treatment is carried out by mechanical and biological methods. The most common method of biological wastewater treatment - the device irrigated fields and filter fields (Fig. 12). This is the land on which the incoming waste water is filtered through the soil and in the process of filtration is exposed to biological treatment.

field irrigation open-drain
Fig. 12. Cut field of irrigation with open drainage:
1 - road precinct, 2 - channel, carrying waste water; 3 - chuberi to adjust the overlap on the map; 4 - card sprinkler; S - open drainage ditches; 6 - protecting the rollers on the fields; 7 - line depression infiltrated water.

Field irrigation divided into sections (maps), equipped with the system of supply canals waste liquid to each section. The cleaning process involves the mechanical, physical, chemical and biological factors. For removal filtered through the soil waste water on the fields have a closed or open drainage.
The device of the closed drainage is laying in soil at a depth of 0.6-1 m network clay pipes with holes between their ends for drainage water. Open drainage is a ditches running along cards and outlet filtered water in reservoirs.
In the fields of irrigation, as in the fields of sanitation, cultivated crops. However, you must remember about the possibility of contamination grown on the fields of irrigation cultures of pathogens of enteric infections and eggs of worms. So the vegetables grown in such fields, can be consumed only after thermal processing.
Filter fields differ from the irrigated fields fact that they are used only for cleaning. Crops are not grown.
Field irrigation and filtration fields arrange at least 300-1000 m from residential areas, and if possible to leeward.
If it is impossible device fields of irrigation and filtration (lack of sufficient territory) apply different artificial biological methods of purification of sewage and household wastewater.