Device and method for realizing urban domestic sewage treatment through plug flow integrated partial nitrification/anaerobic ammonium oxidation by using dissolved oxygen gradient control method

Abstract

The invention discloses a device and method for realizing urban domestic sewage treatment through plug flow integrated partial nitrification / anaerobic ammonium oxidation by using dissolved oxygen gradient control method, and belongs to the field of the sewage biological treatment. An anaerobic fermentation UASB reactor converts partial organic substances in the domestic sewage into the methane toremove; and then the effluent enters a plug flow integrated partial nitrification / anaerobic ammonium oxidation biological membrane reactor, and the nitrogen in the sewage can be efficiently removed through a dissolved oxygen gradient control way. The microorganisms in the reactor are effectively persisted by using the biological membrane, the anti-impact load is strong, and the production of the residual sludge is reduced; and the partial nitrification / anaerobic ammonium oxidation integration process way is in favor of competing dissolved oxygen by the AOB and the NOB, the growth of the NOB isinhibited, and the nitrification reaction is effectively controlled at the nitrite stage. The system disclosed by the invention is simple for operation and high in self-controlling capacity; the aeration quantity in the plug flow reactor is gradually reduced along the pushing of the water flow, the energy source can be effectively utilized, and the urban domestic sewage can be efficiently denitrified through the partial nitrification / anaerobic ammonium oxidation integration.

Description

technical field [0001] The invention relates to a method for removing nitrogen in sewage by using short-range nitrification / anammox fixed biofilm by gradient control of dissolved oxygen, belonging to the field of sewage biological treatment, and is an efficient treatment method for denitrification and carbon removal of domestic sewage. Background technique: [0002] With the development of urbanization, the amount of urban domestic sewage continues to increase; due to the serious eutrophication of water bodies in my country, the sewage discharge standards are becoming more and more stringent. Urban domestic sewage has the problem of low C / N. With the traditional sewage denitrification method, an additional carbon source is required to remove nitrogen in the sewage during the denitrification stage. In addition, the aeration energy consumption in the traditional nitrification stage is large, and the operation cost of the sewage plant is high. [0003] Biofilm technology has be...

AI Technical Summary

Problems solved by technology

Most of the existing anammox process applications are used for high ammonia nitrogen wastewater, because high ammonia nitrogen can effectively inhibit the growth of nitrite oxidizing bacteria and promote the realization of short-term nitrification reaction, but the application of anaerobic ammonium oxidation reaction in urban domestic sewage App is in research phase

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