Apparatus and method for removing nitrogen and phosphorus by adopting DEAMOX-based post anoxic filter enhanced AAO+BAF process

Abstract

The invention discloses apparatus and method for removing nitrogen and phosphorus by adopting a denitrifying ammonium oxidation (DEAMOX)-based post anoxic filter enhanced anaerobic-anoxic-axic+biological aerated filter (AAO+BAF) process, and belongs to the field of sewage treatment by adopting an activated sludge method. The apparatus for removing nitrogen and phosphorus by adopting the DEAMOX-based post anoxic filter enhanced AAO+BAF process mainly consists of AAO treatment, a secondary sedimentation tank, a BAF and a post anoxic filter. By controlling average hydraulic retention time to be within 3-8 hours in an anoxic zone under the condition of low C / N ratio, the method for removing nitrogen and phosphorus by adopting the DEAMOX-based post anoxic filter enhanced AAO+BAF process is capable of synchronously realizing denitrification and phosphorus removal. The BAF is utilized so as to realize highly efficient nitrification. The post anoxic filter is arranged so as to mix ammonia nitrogen (NH4<+>-N) in the water discharged from the secondary sedimentation tank with nitrate nitrogen (NO3<->-N) in the water discharged from the BAF; and carbon source is added, so that short-cut denitrification and DEAMOX reaction occur in the post anoxic filter. Thus, the disadvantage of an AAO + BAF process, namely existence of nitrate nitrogen, is solved so as to further remove total nitrogen in municipal sewage. The apparatus and method for removing nitrogen and phosphorus by adopting the DEAMOX-based post anoxic filter enhanced AAO+BAF process are suitable for construction, upgrade reconstruction and the like of municipal wastewater treatment plants under low C / N ratio municipal sewage conditions; and requirements on total nitrogen and stable quality of discharged water are met.

Description

technical field [0001] The invention relates to a device and method for deep nitrogen and phosphorus removal, belongs to the technical field of activated sludge treatment, and is applicable to the technical fields of sewage treatment such as municipal sewage treatment with low C / N ratio, advanced treatment, standard upgrading and transformation. Background technique [0002] With the continuous advancement of urbanization and the continuous improvement of people's living standards in our country, the discharge of urban sewage has increased significantly. The discharge of nitrogen and phosphorus in sewage will cause eutrophication of water bodies. The removal of nitrogen and phosphorus in sewage treatment plants is getting better and better. more and more critical. At present, the effluent TN (total nitrogen, denoted as N) of many water plants is difficult to meet the first-level A discharge standard (effluent TN≤15mg / L) of the Discharge Standard of Pollutants for Urban Sewag...

AI Technical Summary

Problems solved by technology

At present, the effluent TN (total nitrogen, denoted as N) of many water plants is difficult to meet the "Discharge Standard of Pollutants for Urban Sewage Treatment Plants" (GB18918-2002) Class A discharge standard (effluent TN≤15mg / L)

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