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Device and method for improving A2NSBR denitrifying phosphorus removal technology

A technology of denitrification phosphorus removal and -SBR, which is applied in the device field of improving the A2NSBR denitrification phosphorus removal process, can solve the problems of the contradiction between phosphorus accumulating bacteria and nitrifying bacteria sludge age, insufficient carbon source, etc., and achieve good water quality and stability Good, flexible operation

Active Publication Date: 2014-04-23
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides an improved A 2 The device and method of NSBR denitrification and phosphorus removal process, this invention solves the problems of sludge age contradiction between phosphorus accumulating bacteria and nitrifying bacteria and insufficient carbon source, and realizes simultaneous deep removal of nitrogen and phosphorus

Method used

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  • Device and method for improving A2NSBR denitrifying phosphorus removal technology
  • Device and method for improving A2NSBR denitrifying phosphorus removal technology
  • Device and method for improving A2NSBR denitrifying phosphorus removal technology

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Embodiment approach

[0022] (1) The domestic sewage enters the (A / A / O)-SBR reactor (2) from the raw water tank (1) through the raw water pump (4). VFAs synthesize internal carbon source PHA, release phosphorus at the same time, control ORP=-30~-240mv, DO≤0.2mg / L, water filling ratio 0.2, reaction time 1.5-2h, most of COD is removed during this process.

[0023] (2) After the reaction in the anaerobic stage, the reflux nitrification liquid from the N-SBR reactor (3) is injected through the reflux pump (6). PHA acts as an electron donor, anoxic denitrification phosphorus removal reaction occurs, ORP=-90~-210mv, DO≤0.2mg / L, water filling ratio 0.4, reaction time 4-5h, most of the nitrate nitrogen in this process and phosphorus are removed.

[0024] (3) After the reaction in the anoxic stage, the air pump (10) is turned on, and the gas flow is adjusted by the gas flow meter (14) for short-term aeration, controlling DO=2-3mg / L, and the reaction time is 30 minutes to complete the absorption of remainin...

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Abstract

The invention relates to a device and a method for improving A2NSBR denitrifying phosphorus removal technology, and belongs to the technical field of municipal wastewater treatment. The device mainly comprises an (A / A / O)-SBR reactor and an N-SBR reactor. The method comprises the following steps: firstly allowing domestic wastewater to enter the (A / A / O)-SBR reactor to absorb carbon so as to synthesize PHA and release phosphorus in anaerobic phase, then injecting nitration reflux liquid from N-SBR for aerobic denitrifying phosphorus removal, after completely reacting, aerating for a short time to absorb left phosphorus and blow off the nitrogen, after reaction, standing and precipitating, draining away water into the N-SBR reactor for aerobic aeration for nitration reaction, after nitration reaction, standing and precipitating, back flowing part of the supernate to the anaerobic phase of the (A / A / O)-SBR reactor, discharging the other part of the supernate, wherein the discharged volume is equal to initial water inflow of the system. According to the device and the method, the contradiction of sludge age between the phosphorus-accumulating bacteria and nitrifying bacteria is resolved, the carbon source is saved, and the method and device are suitable for domestic wastewater with low C / N (carbon / nitrogen) ratio, and can be used for synchronously removing nitrogen and phosphorus deeply.

Description

technical field [0001] The present invention relates to an improved A 2 The device and method of the NSBR denitrification and phosphorus removal process belong to the technical field of sewage treatment, and are applicable to fields such as newly-built sewage plants or upgrading of old sewage plants, municipal domestic sewage and industrial wastewater, and scattered rural domestic sewage. Background technique [0002] At present, in terms of global water pollution control, organic pollution has been effectively controlled, and eutrophication caused by nutrients such as nitrogen and phosphorus has become the most concerned issue, and it is also the focus and difficulty of water pollution control. The biological treatment of sewage is widely used in various sewage treatment. However, due to the low C / N ratio and the conflict of sludge age between nitrifying bacteria and phosphorus accumulating bacteria, it is difficult for traditional sewage treatment processes and technologie...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 彭永臻赵伟华王淑莹
Owner BEIJING UNIV OF TECH
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