Northern residential district sewage processing system and method

Abstract

The invention discloses a northern residential district sewage processing system and method. The system comprises a grating tank, an adjusting tank, a magnetic separation water purification unit and a constructed wetland unit. The grating tank, the adjusting tank, the magnetic separation water purification unit and the constructed wetland unit are connected in order through water pipes. According to water quality characteristics of northern residential district sewage, the sewage processing system combined with a magnetic separation water purification technology and a modularized constructed wetland technology is provided, processing advantages of the magnetic separation water purification technology and the modularized constructed wetland technology to pollutants are utilized fully, processing quota of the two novel technologies are distributed reasonably, removal of suspended organic matters, suspensions and total phosphor in sewage is mainly finished during the magnetic separation water purification technology process, and removal of the total nitrogen, ammonia nitrogen and dissolved organic matters is finished by the modularized constructed wetland. The problems are solved that a constructed wetland technology unit is employed alone, the land occupation area is large, obstruction is easy to happen inside the wetland, and ammonia nitrogen and total nitrogen are difficult to meet the water quality standard.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a sewage treatment system and method for northern residential areas. Background technique [0002] The temperature in northern China is relatively low. For the consideration of anti-freezing in winter, underground pipelines in northern residential areas are generally buried deep and have a stable drainage pattern; the water temperature is low, the hydrolysis rate is slow, and the concentration of suspended pollutants is high. State organic matter accounts for a high proportion of the total organic matter concentration (40% to 60%); the water quota is small, and the concentration of organic pollutants is generally high. Table 1 shows the typical water quality indicators of northern residential quarters, COD means chemical oxygen demand, BOD 5 Indicates five-day biochemical oxygen demand, TN indicates total nitrogen, NH 3 -N represents ammonia nitrogen, TP repr...

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Problems solved by technology

The problems existing in the above two processes are: the characteristics of northern residential quarters are not fully considered, and the sewage treatment is not combined with the natural environment of the community

Therefore, the energy consumption of the two treatment processes is relatively high, the cost of treatment and reuse is more than 1.0 yuan / ton of water, and the discharge of mechanically filtered sludge is large, the membrane bioreactor needs to be chemically cleaned regularly, and the management requirements are high. The life of the membrane is short, usually 3 to 5 years, and it needs to be replaced frequently, and the cost is high

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