Improved A2N denitrifying dephosphatation and deep denitrification device and method

Abstract

The invention relates to an improved A2N denitrifying dephosphatation and deep denitrification device and a method, belonging to the field of sewage treatment. The device is characterized in that a combined aeration tank is arranged between an anoxic tank and a final depositing tank; the combined aeration tank realizes synchronous aerobic phosphorus absorption and biofilm nitrification; a cube sponge filling is filled; the batching ratio of filling is 20 to 30 percent of effective volume of a reactor; and the combined aeration tank is provided with an air pump, an air flow meter and an aerator pipe. Under the condition of adding no reaction area in the original A2N technique, the invention replaces a post aeration reaction tank with the combined aeration tank adopting suspending sponge filling as carrier of nitrobacteria, and controls the parameters of aeration amount and temperature and the like to realize the nitrification and synchronous of nitrification-denitrification of ammonia nitrogen. The invention does not add the process flow and energy consumption of operation, solves the fatal problem of the traditional technique, and guarantees the stable and high-efficiency removal of nitrogen and phosphorus in effluent quality.

Description

technical field [0001] The invention relates to denitrification dephosphorization and deep denitrification technology, is suitable for the deep treatment of urban domestic sewage containing nitrogen and phosphorus, and belongs to the technical field of denitrification and dephosphorization of sewage by activated sludge method. Background technique [0002] Denitrification, phosphorus and nitrogen removal is a new technology for sewage biological treatment that has attracted much attention in recent years. The double-sludge denitrification, phosphorus and nitrogen removal process developed based on this theory can improve the denitrification of urban sewage, especially urban sewage with low C / N ratio. Advanced treatment such as nitrogen and phosphorus removal is of great significance. [0003] The traditional double-sludge denitrification denitrification and denitrification double-sludge process, also known as A 2 The N double sludge denitrification, phosphorus and nitrogen ...

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Problems solved by technology

[0005] However, the concentration of ammonia nitrogen in the effluent of the final sedimentation tank of this process is too high, which is a bottleneck that needs to be solved urgently in this process

Since a certain amount of ammonia nitrogen is carried in the transcendence sludge, but there is no nitrification tank specially used for ammonia nitrogen nitrification after the anoxic tank, the ammonia nitrogen has not been effectively removed except for the growth of microorganisms themselves, resulting in the effluent of the sedimentation tank It is inevitable that ammonia nitrogen exceeds the standard

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