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Biological denitrification device and method for coupling segmented water feeding with synchronous short-cut nitrification and denitrification

A short-range nitrification and biological denitrification technology, which is applied in the field of high-efficiency biological denitrification devices with low carbon-to-nitrogen ratio sewage, can solve the problems of excessive consumption, high operating costs, and difficulty in reaching the standard of effluent water quality, so as to save oxygen supply and infrastructure costs , the effect of improving the nitrogen removal efficiency

Inactive Publication Date: 2021-06-15
北控水务(中国)投资有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a device and method for coupling synchronous short-range nitrification and denitrification with segmented water inflow to realize high-efficiency biological denitrification of sewage with low carbon-to-nitrogen ratio. and high operating costs

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  • Biological denitrification device and method for coupling segmented water feeding with synchronous short-cut nitrification and denitrification

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[0031] Below in conjunction with accompanying drawing and specific example the present invention will be further described:

[0032] Inoculation of ordinary activated sludge in SBR reactor for short-cut nitrification and denitrification with subsection water inflow. NH in raw water in ordinary biological treatment of municipal sewage 4 + -N is oxidized to NO by ammonia oxidizing bacteria 2 - -N, then oxidized to NO by nitrifying bacteria 3 - -N, denitrifying bacteria then convert NO 3 - -N is reduced to nitrogen. Since the low C / N sewage cannot provide enough organic carbon source, it is necessary to add carbon source again to complete the denitrification reaction. The object of the present invention will NH in raw water 4 + -N oxidation to NO 2 - -N, directly reduced to N by denitrifying bacteria 2 , which can not only solve the problem of insufficient carbon source, but also save about 25% of the oxygen supply. Ordinary activated sludge contains ammonia oxidizin...

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Abstract

The invention discloses a biological denitrification device and method for coupling segmented water feeding with synchronous short-cut nitrification and denitrification. The biological denitrification device comprises a short-cut nitrification and denitrification SBR (sequencing batch reactor) and an automatic control system. Municipal sewage is subjected to equal-proportion water inlet treatment in four stages. In the first stage, sewage enters the SBR, anoxic stirring is performed firstly, then low-oxygen aeration stirring is performed, aeration is stopped when DO reaches about 1.5 g / L, and then anoxic stirring is performed. Then, second-stage, third-stage and fourth-stage water feeding is carried out. After anoxic stirring and four-section water feeding are completed, the SBR precipitates and discharges water, and the sludge concentration is controlled to be 3000-4000 mg / L. Equal-proportion segmented water feeding is coupled with short-cut nitrification and denitrification, raw water enters all anoxic segments in a segmented mode, denitrification is carried out through a carbon source in the raw water, the problem of nitrate nitrogen is solved, and the problem of inhibiting nitrite oxidizing bacteria is solved through a low-oxygen and anoxic alternating operation mode. The efficient denitrification effect of low-C / N municipal sewage under the condition that an external carbon source is not needed is achieved, energy consumption is reduced, and the municipal sewage treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of municipal sewage biological treatment, in particular to a device and method for realizing high-efficiency biological denitrification of sewage with a low carbon-to-nitrogen ratio by coupling synchronous short-range nitrification and denitrification with segmented water inflow. Background technique [0002] The staged water inflow process is an efficient sewage biological denitrification process, and it is a biological denitrification and phosphorus removal process developed at home and abroad in recent years. Alternate anoxic / aerobic settings make full use of the raw water carbon source for denitrification, without digestive juice reflux, saving power consumption and carbon source chemicals. At the same time, it has a strong ability to resist shock loads. The equal-proportion segmental water-inflow SBR process makes full use of the key amount of brine as the carbon source for denitrification reaction thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302C02F2209/08C02F2209/14C02F2209/16C02F2101/16C02F2203/006
Inventor 薛晓飞史彦伟冯艳霞穆永杰张丽丽姚爱栋任少辉郭立宁曹之淇
Owner 北控水务(中国)投资有限公司
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