Device and method for nitrogen and phosphorus removal for low CN ratio urban sewage through nitrosation and anaerobic ammonia oxidation coupling denitrifying phosphorus removal intensification

Abstract

The invention discloses a device and a method for nitrogen and phosphorus removal for low CN ratio urban sewage through nitrosation and anaerobic ammonia oxidation coupling denitrifying phosphorus removal intensification, and belongs to the field of biological sewage treatment. The device comprises an urban sewage raw water tank, a denitrifying phosphorus removal reactor, an adjusting water tank, a sedimentation tank, and an integrated partial nitrification and anaerobic ammonia oxidation reactor; when the urban sewage enters the denitrifying phosphorus removal reactor, phosphorus-accumulating bacteria utilizes organic carbon source in the urban sewage for anaerobic phosphorus release, sedimentation and water drainage are performed, the amount of output water is adjusted by the adjusting water tank, then the output water enters the integrated partial nitrification and anaerobic ammonia oxidation reactor, contained NH4<+>-N is converted into N2 to be effectively removed through partial nitrification and anaerobic ammonia oxidation, contained PO4 <3-> and a small amount of NO3<->-N produced in the anaerobic ammonia oxidation flow back with the output water to the denitrifying phosphorus removal reactor for denitrifying phosphorus removal, and then micro-aeration is carried out for a period of time. The method reduces oxygen consumption and energy consumption, improves the nitrogen and phosphorus removal rate, and avoids the problem of insufficient carbon source.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a device and method for denitrification and dephosphorization coupled with nitrification and anaerobic ammonium oxidation to strengthen low CN ratio urban sewage denitrification and dephosphorization. Background technique [0002] The phosphorus and nitrogen removal of sewage has always been a hot spot in the field of sewage research, and the research on the existing sewage treatment process is also developing towards the direction of high efficiency and low energy consumption. The short-range nitrification and anammox denitrification technology realizes the shortest and most efficient path for converting ammonia nitrogen into nitrogen gas, and does not require organic carbon sources and does not need to add acid-base neutralization reagents. Denitrification and phosphorus removal technology realizes the unity of denitrification and phosphorus removal process,...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for denitrification and dephosphorization coupled with nitrification and anaerobic ammonium oxidation to strengthen the denitrification and dephosphorization of urban sewage with low CN ratio, so as to realize high-efficiency, energy-saving and simultaneous denitrification and dephosphorization of urban sewage with low carbon-to-nitrogen ratio , to solve the problems of insufficient carbon source, denitrification and phosphorus removal can not be optimal at the same time in the traditional nitrogen and phosphorus removal process, the process flow is simple, and the operating cost is low

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