Sewage treatment tanks are classified according to sewage sources, and sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage and medical sewage, while domestic sewage is sewage produced in daily life, which refers to a complex mixture of inorganic substances and organic substances in various forms, including: ① floating and suspended solid particles; ② Colloidal and gelatinous diffusion; ③ Pure solution. According to the quality of water pollution, there are two types of water pollution: one is natural pollution; The other is man-made pollution. At present, man-made pollution is the most harmful to water bodies. Water pollution can be divided into three categories: chemical pollution, physical contamination and biological pollution. Pollutants mainly include: (1) industrial wastewater discharged without treatment; (two) untreated sewage discharge; (3) Farmland sewage that uses a lot of chemical fertilizers, pesticides and herbicides; (four) industrial waste and domestic garbage piled up along the river; 5] Soil erosion; [6] Mine sewage. There are many methods to treat sewage, which can be generally summarized as physical method, chemical method and biological method.
Sewage treatment plant: Some people have investigated more than 100 large-scale treatment plants, half of which are exposed to the sun, some of which are short of funds and low in cost, with general efficiency less than 70% and low only 40%.
Sewage treatment cost and energy consumption: basically high energy consumption and low efficiency. At present, urban domestic sewage discharge is the main pollution source of urban water in China, and urban domestic sewage treatment is the top priority of urban water saving and urban water environment protection at present and in the future, which requires us to take the construction of domestic sewage treatment facilities as an important part of urban infrastructure, and it is a top priority. Direct utilization of sewage now: With the progress of human society and the development of science and technology, direct utilization of sewage has become possible. Sewage source heat pump system is used to utilize urban primary sewage. The so-called primary sewage is the direct discharge of untreated domestic or industrial wastewater from the city. At present, the utilization and distribution means that the primary sewage directly enters the sewage source heat pump system for heat exchange, and provides indoor cooling and heating for urban buildings with a small amount of electricity consumption. There are several technical difficulties to be overcome in sewage reuse: blockage, corrosion and heat exchange efficiency.
Sewage source heat pump system consists of sewage heat exchanger and sewage source heat pump. After the urban primary sewage directly enters the sewage heat exchanger for heat exchange, the heat after heat exchange is transferred to the room through the heat pump in the sewage source heat pump.
The reuse of urban primary sewage has the advantages of energy saving, environmental protection and no pollution.
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