AAO continuous-flow aerobic granular sludge nitrogen and phosphorus removal process and system

An aerobic granular sludge, nitrogen and phosphorus removal technology, applied in water/sludge/sewage treatment, water/sewage treatment, biological water/sewage treatment, etc., to promote the improvement of sludge quality and improve the effect of mud-water separation , Conducive to the effect of biological nitrogen and phosphorus removal

Active Publication Date: 2016-11-30
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] In order to overcome the current problems of cultivation and application of aerobic granular sludge in continuous flow, and aiming at the characteristics and defects of the AAO process, the present invention provides an AAO continuous flow aerobic granular sludge denitrification and phosphorus removal process

Method used

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  • AAO continuous-flow aerobic granular sludge nitrogen and phosphorus removal process and system

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example 1

[0018] Example 1: An AAO continuous flow aerobic granular sludge nitrogen and phosphorus removal process, the sludge from the aeration tank of the sewage treatment plant was inoculated into the reactor at 1000mg / L, the inoculated sludge was in the form of floc, and the SVI was 80ml / g, using sodium acetate, ammonia oxide, potassium dihydrogen phosphate to make COD 1000mg / L, NH 4 + - Sewage with a N concentration of 60mg / L and a TP concentration of 10mg / L, continuous water inflow operation, the reflux ratio in the sludge is set to 2Q (Q is the inflow flow rate), and the light sludge in the dual-zone secondary sedimentation tank is directly discharged. Part of the sludge is refluxed, and the other part is dried and crushed to 100-800 mesh and put into the front end of the biochemical tank. After 25 days of continuous operation of the reactor, the aerobic sludge is granulated, and the sedimentation rate is 20-30m / h, SVI<50ml / g, the removal rate of COD is about 95%, the removal ...

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Abstract

The invention relates to an AAO continuous-flow aerobic granular sludge nitrogen and phosphorus removal process. Intake water enters a biochemical tank after passing coarse and fine screens and a primary settling tank, the biochemical tank comprises an anaerobic tank, an anoxic tank and an aerobic tank, part of effluent of the biochemical tank flows back to the front end of the anoxic tank, the other part enters a secondary sedimentation tank for mud-water separation, the secondary sedimentation tank is a dual-region sedimentation tank, light sludge is collected prior to direct concentrating, drying and outward transportation for disposal, heavy sludge is collected, then part of the heavy sludge serves as excess sludge flowing back to the front end of the anaerobic tank, the other part is dried and crushed to be put to the front end of the biochemical tank, and effluent of the secondary sedimentation tank passes a disinfection apparatus prior to up-to-standard discharge. The invention further relates to an AAO continuous-flow aerobic granular sludge nitrogen and phosphorus removal system. Granulation of aerobic sludge is promoted, carbon sources are supplemented to denitrification for promoting nitrogen removal, and biological phosphorus removal is enhanced.

Description

technical field [0001] The invention relates to an AAO continuous flow aerobic granular sludge denitrification and dephosphorization process and system. technical background [0002] Compared with ordinary activated sludge, aerobic granular sludge technology has good settling performance, high sludge concentration, and can withstand high organic load, load shock and toxic substances, etc., and it is becoming a hot research and report from all walks of life. Generally speaking, the formation of aerobic granular sludge is a complex process involving physical, chemical and biological effects. The mainstream view describes this process as a phenomenon of biological aggregation formed by microbial self-fixation under certain hydrodynamic conditions. . At present, the mainstream mechanism of aerobic granular sludge formation mainly includes extracellular polymer hypothesis, self-aggregation principle, filamentous bacteria hypothesis and condensation nucleus mechanism. The mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/00C02F1/52C02F3/302C02F3/308C02F9/00C02F2301/08C02F2303/04
Inventor 李军陈涛
Owner ZHEJIANG UNIV OF TECH
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