Anaerobic-anoxic/aerobic-parallel reinforced dephosphorization and denitrification technique

Abstract

The invention relates to an anaerobic-anoxic/aerobic-parallel reinforced dephosphorization and denitrification technique which comprises the following steps: raw water is introduced into an anaerobic tank and treated by the anaerobic tank, enters an anoxic tank, is treated by the anoxic tank, and enters an aerobic tank; part of water flow treated by the aerobic tank flows back to the anoxic tank, and the rest enters a secondary precipitation tank to precipitate; the supernate in the secondary precipitation tank is discharged; and the precipitated sludge is partially discharged and partially flows back to the anoxic tank to enter the anaerobic tank together with the raw water. The technique is characterized in that part of the water flow treated by the anaerobic tank is introduced into the pre-anoxic tank and mixed with return sludge of the secondary precipitation tank to remove nitrate nitrogen in the sludge, and flows back to enter the anaerobic tank together with the raw water. The technique is suitable for any sewage in need of denitrification and dephosphorization treatment. The technique effectively solves the problem of lower dephosphorization efficiency since nitrate nitrogen carried by the return sludge destroys the anaerobic environment, and provides sufficient organic matters for anaerobic phosphorus release. The technique reduces the volume of the anoxic tank and anaerobic tank, lowers the power consumption and enhances the dephosphorization efficiency.

Description

[0001] technology neighborhood [0002] The invention relates to the technical field of sewage treatment, in particular to an anaerobic parallel flow anoxic aerobic enhanced phosphorus and nitrogen removal process suitable for urban domestic sewage treatment. Background technique [0003] In recent years, there has been a large area of ​​water eutrophication in my country, and the removal of phosphorus and nitrogen from sewage has become a research hotspot. Biological phosphorus and nitrogen removal is achieved by phosphorus-accumulating bacteria with excessive accumulation of phosphorus for growth. The more classic biological phosphorus and nitrogen removal processes include A 2 / O process, JHB process, MUCT process, etc. A 2 In the / O process, a large amount of nitrate nitrogen will be carried in the return sludge, which will destroy the anaerobic tank environment and reduce the efficiency of anaerobic phosphorus release. The denitrification of the return sludge in the JH...

AI Technical Summary

Problems solved by technology

[0005] 1. The return sludge is diluted by the effluent of all the anaerobic tanks in the anoxic tank 1, and the sludge concentration is reduced, thereby increasing the denitrification time of the return sludge and increasing the volume of the anoxic tank;

[0006] 2. The return sludge is diluted in the anoxic tank 1, so that the return flow from

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