【 Weak current College 】 community water supply and sewerage and water heating, water supply-III Community drainage system

This section on the drainage system of choice, the composition of the drainage pipe system, the layout characteristics of sewer and drainage lifting system, such as the narrative, and community wastewater treatment facilities, wastewater treatment technology made simple. 　　Learning should be focused on having the right community drainage system of selection and its corresponding piping systems. I. Community drainage system in the living area of shunt system refers to the sewage pipe and drainage of rainwater pipes split; combined refers to the same tube drainage within accepted sewage and rainwater drainage. Residential drainage outlet should generally be discharged into the city (town) water pipeline system. Therefore the community should and urban drainage system (town) drainage system.　　Our new live community generally use the triage system.　　Second, community composition of the drainage pipe system and installation of required separation sewerage system, depending on the capabilities of different drainage pipe separated sewer system and storm sewer system. Community sewer system, according to the location of the pipeline layout and function of the system, the pipeline can be divided into the next household pipes, drainage pipes and community residential drainage pipes. Its layout programs generally according to the main pipe, pipes, received the order of households, according to community planning, road and building layout, terrain elevation, sewage, according to the pipeline short, depth and try to make the principle of gravity.　　Layout should be considered when dry pipe pipes access location, layout of branch pipes should be considered by operators of access locations.　　Drainpipe laying, and building the foundation of the horizontal spacing, when piping buried deep in the Foundation, shall be not less than 1.5m; when the pipeline is buried deep in the Foundation should be not less than 2.5m. III. Community sewer system layout characteristics ensure rain (particularly heavy rain) timely discharge pipe drainage system is out of basic requirements. ① in the layout on the use of natural terrain slope, in the shortest possible distance by gravity flow discharged to water bodies or municipal storm sewer. Rainwater pipeline laying roads should be parallel and layout on the sidewalk or flowers, avoid ponding area when traffic or repair damaged pavement when pipeline. 　　② Community gullies arranged according to the terrain, buildings and road conditions determine, first, it is set in the interchange, near the entrance of the building Unit out of the rain falls, buildings and structures in the vicinity of the tube before open spaces and green areas of the low-lying Department; the second is the number set by the catchment area, meeting water flow and selection of gullies and discharge capacity; third, along the street layout spacing is 20 ~ 40m, connection tube length should not exceed 25m. Four, community water drainage and sewage treatment (1) it is necessary to promote community and drainage
When drainage depending on difficulty of gravity self-leveling, additional drainage enhancement measures, such as drainage pumping station. 2. Community sewerage and sewage treatment (1) community sewage disposal
Residential community of sewage disposal should conform to the existing sewage integrated emission standards and the wastewater discharged to municipal sewer water quality standards requirements.
General residential community wastewater discharged to municipal sewer met the water quality requirements, you can direct the nearest discharge to municipal sewers; if away from the town or other reason cannot be discharged into sewage in the municipal sewage pipelines, water should be based on emissions, the strict implementation of the waste water comprehensive emissions standards, usually uses the secondary biological treatment, compliance will be issued only after discharge.

(2) community wastewater treatment facilities in settings
The community is set sewage treatment facilities, according to the urban master plan, in accordance with the trend of community sewage disposal, the master plan of urban drainage management and manpower. Set of principles as described below.
① towns of residential sewage, as far as possible into the towns of centralized sewage treatment plants, municipal sewage collection system should be routed to the living area.
② towns have been built or determined in the near future to build wastewater treatment plant, wastewater can be discharged into sewage service scope of urban sewage pipe, the community should not be built sewage treatment facilities.
③ If towns did not build wastewater treatment plant, wastewater treatment plants in the town planning services, and has been discharged into the town's pipeline system, the community will not need to build a centralized sewage treatment facilities.
④ If community sewage for various reasons could not be discharged into sewage plant service range of sewage pipes, emission standards should be adhered to, by going to settings for discharges of wastewater treatment facilities, treatment compliance will be issued only after discharge.
⑤ If you live in the community in certain public buildings sewage containing toxic, harmful substances or certain indicators to emission standards should be set to the local sewage treatment facilities, compliance will be issued only after processing.

(3) community wastewater treatment technology
Community sewage water is a general domestic sewage, municipal wastewater biological treatment techniques can apply to wastewater treatment.
Residential area of large, centralized sewage reaches more than size, 1000m3 community sewage treatment according to the existing outdoor drainage design code select appropriate biological treatment process, the design of the wastewater treatment structures. In the selection process should be fully taken into account in community settings features, handle structure should be arranged indoors, on the surroundings should be reduced to a minimum.
Residential community of smaller or distributed processing, waste water treatment design flow is small, then treatment facilities may use secondary biological treatment requires the design of the wastewater treatment plant for processing.