Small domestic sewage in villages and towns Water treatment equipment engineering
The selection of rural domestic sewage treatment technology must comprehensively consider the local socio-economic development level, the source of rural domestic sewage and the use after treatment. Different sewage sources and different uses of treated sewage (renewal water) require different treatment levels and technologies.
Rural domestic sewage mainly contains various organic pollutants, pathogenic bacteria and other pollutants. Renewal water is mainly used for irrigation of various crops (plants), landscape or environmental water. According to the specific use of renewal water, determine the high level or level of sewage to be treated. two Rural domestic sewage treatment system At present, the rural domestic sewage treatment system mainly uses one or more treatment technologies or processes to treat sewage according to the requirements of rural domestic sewage treatment level. According to the applicable conditions of sewage treatment technology, rural domestic sewage treatment systems can be divided into centralized treatment and decentralized treatment. （ one ）Centralized treatment system for rural domestic sewage treatment. Centralized treatment system mainly refers to (small) sewage treatment plant, constructed wetland system or land treatment system, which can reduce pollutants in sewage through a series of physical, chemical and biological measures, so as to achieve the purpose of sewage purification and resource utilization. （ two ）Decentralized treatment system for rural domestic sewage treatment. The distributed treatment system is a highly concentrated miniature sewage treatment plant.
Small domestic sewage treatment equipment project in villages and towns Working principle of rural domestic sewage treatment equipment The rural domestic sewage treatment equipment adopts the internationally advanced biological treatment process to collect and remove BOD5 、 COD 、 NH3-N In one body. The rural domestic sewage treatment equipment has the advantages of stable and reliable technical performance, good treatment effect, low investment, small land occupation, convenient maintenance, etc. The rural domestic sewage treatment equipment is buried below the surface, and the surface above the equipment can be used as greening or other land, without building houses, heating and insulation. The rural domestic sewage treatment equipment adopts the two-stage biological contact oxidation process, which adopts the push flow biological contact oxidation process, and its treatment effect is better than the fully mixed or two-stage series fully mixed biological contact oxidation tank. Moreover, the activated sludge tank has small volume, strong adaptability to water quality, good shock load resistance, stable effluent quality and no sludge bulking.
Small domestic sewage treatment equipment project in villages and towns The removal of organic pollutants and ammonia nitrogen by integrated sewage treatment equipment mainly depends on the AO biological treatment process in the equipment. The working principle is at Level A. Because of the high concentration of organic matter in the sewage, the microorganism is in a state of gas deficiency. At this time, the microorganism is a facultative microorganism, which converts and decomposes the organic ammonia in the sewage into NH3-N. At the same time, the organic carbon is used as an electronic donor to convert NO - 2-N and NO - 3-N into N2. In addition, some organic carbon sources and NH3-N are also used to synthesize new cell substances. Therefore, Class A tank not only has a certain organic matter removal function, reduces the organic load of the subsequent aerobic tank, but also facilitates the nitrification. It also relies on the high concentration of organic matter in the raw water to complete the denitrification and ultimately eliminate nitrogen eutrophication pollution. At Grade O, the concentration of organic matter has been greatly reduced, but a certain amount of organic matter and higher NH3-N still exist. In order to further oxidize and decompose the organic matter, and at the same time, nitrification can be carried out smoothly when the carbonization is completed, aerobic biological contact oxidation tank with lower organic load is set at Level O. There are mainly aerobic microorganisms and aerobic bacteria (nitrifying bacteria) in the O tank. Aerobic microorganism decomposes organic matter into CO2 and H2O; Autotrophic bacteria use inorganic carbon generated from organic matter decomposition or CO2 in the air as the nutrient source to convert NH 3-N in sewage into N 2-ON, N 3-ON, and the effluent from the O level pool returns to the A level pool, providing an electronic receptor for the A level pool, and eventually eliminating nitrogen pollution through denitrification.
Small domestic sewage treatment equipment project in villages and towns The domestic sewage from Jinjiang urban area, east area of Jinjiang city and south area of Licheng river flows into the sewage plant through the pipe network, and first comes to the starting point - in front of the plant pump Station. At this time, the foul smelling sewage enters the state of preparation for breakthrough. The pump station increases the pressure to raise the level of sewage to the "peak height" of the whole "magic", preparing for the gravity performance of "magician 1".
