Method for treating micro polluted water by using biological nitrogen removal and physicochemical enhanced phosphorus removal combined process

Abstract

The invention discloses a method for treating micro polluted water by using a biological nitrogen removal and physicochemical enhanced phosphorus removal combined process, and belongs to the technical field of water pollution purification treatment. The inlet water enters a biological contact oxidation tank through a lifting pump, and flexible fibers are used as a film forming filler and a rotary fan is adopted for aeration in the tank; the outlet water overflows to a quick filter tank, the bottom of the tank is provided with a backwashing pipeline, and the tank is periodically backwashed to avoid blockage; the outlet water of the quick filter tank passes through a deoxidization tank from bottom to top, so dissolved oxygen (DO) in the water is reduced, and a favorable condition is provided for subsequent denitrification; an facultative tank realizes denitrification by adopting a camphorwood leaf and ceramsite combined filler to remove TN; the outlet water flows into a flocculation reaction tank and is subjected to enhanced coagulation with stirring; and soil-liquid separation is performed in a phosphorus removal sedimentation tank, and the supernate flows through an anthracite filler device from bottom to top and finally flows into a lake. The method ensures that the substances such as chemical oxygen demand (COD), NH4+-N, NO3--N, TN, TP, SS, Chla and the like in the outlet water are furthest removed, and the outlet water reaches the class III water quality standard of Environmental Quality Standards for Surface Water (GB3838-2002).

Description

technical field [0001] The invention relates to a method for treating micro-polluted water bodies through a combination process of biological denitrification and physicochemical method enhanced phosphorus removal, which belongs to the technical field of water pollution control and environmental protection purification treatment. Background technique [0002] With the development of the economy and the acceleration of urbanization, humans have discharged a large amount of industrial wastewater, domestic sewage, and plant nutrients such as nitrogen and phosphorus in farmland runoff into lakes, reservoirs, estuaries, bays and other slow-flowing water bodies, resulting in eutrophication The phenomenon is getting worse. According to the statistics of the State Environmental Protection Administration's "2006 China Environmental Status Bulletin", in 2006, among the 408 key monitoring sections of 197 rivers in the country's seven major water systems, the sections with water quality ...

AI Technical Summary

Problems solved by technology

Traditional water treatment processes of coagulation, sedimentation, filtration, and disinfection only have a good removal effect on hydrophobic macromolecular organic matter in water, and have little effect on the removal of other pollutants

Although the chemical pre-oxidation treatment method has a certain treatment effect on water with low organic pollution, it is dangerous because some oxidants are not easy to store and need to be prepared temporarily. high processing cost

The main purpose of biological pretreatment is to treat pollutants that cannot be effectively removed by conventional treatment processes. Compared with physical and chemical methods, there are problems such as large one-time investment in infrastructure construction, large floor area and inconvenient operation and management.

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