The construction of urban sewage treatment facilities should consider the local natural and economic conditions and combine the technical characteristics of sewage treatment facilities.
Sewage discharged from cities and towns is generally composed of sewage discharged from residents' daily life, small catering services, small light industry, handicraft production and public health service facilities, among which domestic sewage and industrial wastewater are the main ones.
It is very important to formulate scientific and reasonable water environment and water resources protection targets, which is also one of the keys to sewage treatment. When setting the target, we must divide the environmental functions of rivers, lakes and other wetlands according to the requirements of local economic and social development, natural geographical environment and overall urban planning, and determine the economic and social functions and corresponding control standards of various water bodies. Determine the engineering control measures and management control measures.
Based on the principle of adapting measures to local conditions, scientific development and quality first, the sewage treatment plant will be built. Science and technology are the primary productive forces, and it is valuable to treat urban sewage by relying on science and technology, although the cost is higher to some extent.
Technical characteristics of sewage treatment facilities:
1, biological contact oxidation method
The process flow is: water inlet → regulating tank → contact oxidation tank → disinfection tank → water outlet. The oxidation tank is filled with fillers, and the pollutants in the sewage are removed by aeration under the action of microorganisms on the biofilm of the fillers, so that the sewage is purified.
2, oxidation ditch method
The process flow is: water inlet → oxidation ditch → secondary sedimentation tank → disinfection tank → water outlet. Sewage contacts with activated sludge in the oxidation ditch and is aerated at the rotating brush, thus completing biochemical reaction and sewage purification in the annular ditch. There are many forms of oxidation ditch method, such as Carroussel ditch, Sanlian ditch, comprehensive ditch and Orbar ditch.
3.SBR method
The process flow is: water inlet → grid → grit chamber →SBR reaction chamber → disinfection tank → water outlet. The main process equipment is SBR reaction tank, and five cycles of water intake, reaction, precipitation, drainage and idleness are alternately completed.
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