Device and method for enhancing nitrogen and phosphorus removal by combining multistage AO short-cut denitrification coupling Anammox with sludge hydrolytic acidification

Abstract

The invention discloses a device and method for enhancing nitrogen and phosphorus removal by combining multistage AO short-cut denitrification coupling Anammox with sludge hydrolytic acidification, and belongs to the technical field of activated sludge process sewage treatment. The system comprises a water tank, a water pump, a biochemical reaction area, a hydrolytic acidification tank and the like, raw water is injected into the reaction area in a segmented manner by a multi-stage AO segmented water inlet pipeline, so that the efficient utilization of organic matters in the raw water is ensured; biological membrane carriers are added into an anaerobic zone and an anoxic zone to enrich anaerobic ammonia oxidizing bacteria, nitrite nitrogen is generated through short-cut denitrification to provide a substrate for the anaerobic ammonia oxidizing bacteria, and nitrogen autotrophic removal is achieved; nitrification and phosphorus-accumulating bacteria aerobic phosphorus absorption are carried out in an aerobic zone; and part of residual sludge in a secondary sedimentation tank enters the hydrolytic acidification tank to convert macromolecular organic matters into micromolecular organic matters, a hydrolytic acidification mixture and the residual sludge in the secondary sedimentation tank synchronously flow back to the anaerobic zone, and the micromolecular organic matters serving as a high-quality carbon source can promote short-cut denitrification. The system provides a new method for efficient and energy-saving treatment of urban sewage.

Description

Technical field: [0001] The invention relates to a multi-stage AO-based short-range denitrification coupled Anammox technology using sludge hydrolysis and acidification mixture to strengthen denitrification and phosphorus removal, and belongs to the field of sewage biological treatment. It is suitable for high-efficiency, energy-saving nitrogen and phosphorus removal processes in urban sewage treatment plants. Background technique: [0002] The output of urban sewage in my country is increasing year by year, and the discharge of nitrogen, phosphorus and other pollutants in sewage into slow-flowing water bodies will cause serious water eutrophication, manifested as algal blooms, destruction of aquatic ecosystems, and deterioration of water quality in circulating water bodies. Biological nitrogen and phosphorus removal from urban sewage is considered to be an effective way to solve water eutrophication. At present, most domestic urban sewage treatment plants adopt traditional...

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Problems solved by technology

At present, most domestic urban sewage treatment plants adopt traditional processes such as A / O, AAO, CAST, oxidation ditch, etc. Most of the urban sewage treatment plants cannot meet the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) Class A standard

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