System and method of low-carbon-source town sewage biological denitrification by adopting push-flow-type anoxic tank

Abstract

The invention belongs to the field of water environment protection, and particularly provides a system and method of low-carbon-source town sewage biological denitrification by adopting a push-flow-type anoxic tank, and belongs to the field of integration of activated sludge and biological membrane processes. The method is an important improvement based on an anoxic-aerobic biological denitrification process. An anoxic tank is transformed into the push-flow-type reaction tank and is divided into three to four sections; an elastic filler is added into an anoxic reactor to maintain a high sludge concentration, and a relatively long hydraulic retention time is adopted in the anoxic tank. In the anoxic tank, a push-flow reaction mode that three to four complete mixing reactors are connected in series is actually carried out. The method is suitable for improving a conventional biological denitrification process (the denitrification principle is based on combination of anoxic denitrification-aerobic nitrification), and the requirement on the carbon-nitrogen ratio of sewage can be reduced to 3.0-3.2 while the denitrification rate of the conventional process can be maintained and the denitrification rate is slightly improved. Compared with the conventional biological denitrification process, the method has the advantages that only the anoxic tank needs to be transformed, and the method is suitable for upgrading and modifying the existing process. According to the method disclosed by the invention, aeration energy consumption is reduced, and a supplementary carbon source is saved or even cancelled, so that operation cost is relatively low, and good economical efficiency is achieved.

Description

technical field [0001] The invention belongs to the field of water environment protection, and in particular relates to a low-carbon source sewage biological denitrification system and method using a push-flow anoxic pool. Background technique [0002] In the process of urban sewage treatment, the removal of total nitrogen and total phosphorus needs to meet a certain amount of organic matter respectively. Because the concentration of organic matter in the influent of urban sewage plants is generally low, it is difficult to remove nitrogen and phosphorus in urban sewage. Urban sewage plants usually focus on the removal of total nitrogen, and the removal of total phosphorus can be completed to a certain extent by adding chemicals. How to improve the removal rate of total nitrogen for sewage with a low carbon-to-nitrogen ratio is a key issue in the current urban sewage treatment. [0003] The traditional biological nitrogen and phosphorus removal method is A N / O process, on t...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a low-carbon source sewage biological denitrification system and method using a plug-flow anoxic tank, so as to solve the dependence and demand of the existing biological denitrification system on carbon sources, and to achieve The purpose of reducing the demand for carbon sources

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