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Sludge fermentation-based sewage treatment system and method using internal carbon source

A technology of sewage treatment system and sewage treatment method, applied in the direction of water/sludge/sewage treatment, sludge treatment, water/sewage treatment, etc., which can solve the problem of biochemical denitrification plus large amount of carbon source and discharge of primary sludge Major issues, to achieve the effect of reducing the cost of supplementary carbon sources

Pending Publication Date: 2021-10-08
光大水务科技发展(南京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of large discharge of primary sludge and large amount of additional carbon source in biochemical denitrification existing in the existing sewage treatment technology, the present invention provides a sewage treatment system and method based on sludge fermentation using internal carbon source

Method used

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  • Sludge fermentation-based sewage treatment system and method using internal carbon source

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Embodiment 1

[0062] The primary sludge discharged from the high-density sedimentation tank of a municipal sewage treatment plant in Dalian, which uses multi-stage biological filter as the main process, is used as the sludge fermentation system and enters the sludge conditioning tank. The initial concentration of the primary sludge is MLSS=50460mg / L, the concentration of the sludge after conditioning is MLSS=24895mg / L, and the concentration of dissolved organic matter in the sludge supernatant is SCOD=3950mg / L. Sludge fermentation tank, anaerobic fermentation acid production reaction occurs, the operating parameters of the control fermentation tank are pH 6.01 ~ 7.17, ORP-142.6mv ~ -228.5mv, T = 20 ° C, the hydraulic retention time of fermented sludge in the fermentation tank HRT = 4d, after sludge fermentation, the concentration of the sludge in the fermentation liquid is MLSS=18860mg / L, and the 30% volume ratio fermentation liquid is refluxed, and enters the sludge conditioning tank as the...

Embodiment 2

[0064]The primary sludge discharged from the high-density sedimentation tank of a municipal sewage treatment plant in Dalian, which uses multi-stage biological filter as the main process, is used as the sludge fermentation system and enters the sludge conditioning tank. The initial concentration of primary sludge is MLSS=49320mg / L, after conditioning, the sludge concentration is MLSS=30080mg / L, and the concentration of dissolved organic matter in the sludge supernatant is SCOD=1800mg / L. After conditioning, the sludge enters Sludge fermentation tank, anaerobic fermentation acid production reaction occurs, control the operating parameters of the fermentation tank to be pH 6.74~7.40, ORP-169.6mv~-261.4mv, T=15℃, hydraulic retention time of fermented sludge in the fermentation tank HRT=4d After the sludge is fermented, the concentration of the fermentation liquid sludge is MLSS=25860mg / L, and 20% of the fermentation liquid is refluxed, and enters the sludge conditioning tank as the...

Embodiment 3

[0066] The primary sludge discharged from the high-density sedimentation tank of an urban sewage treatment plant in Qingdao, which uses multi-stage biological filter as the main process, is used as the sludge fermentation system feed and enters the sludge conditioning tank. The initial concentration of primary sludge is MLSS=42500mg / L, after conditioning, the concentration of sludge is MLSS=22700mg / L, the concentration of dissolved organic matter in the sludge supernatant is SCOD=2750mg / L, after conditioning, the sludge enters Sludge fermentation tank, anaerobic fermentation acid production reaction occurs, the operating parameters of the fermentation tank are controlled to be pH 6.08~6.85, ORP-173.9mv~-190.4mv, T=20℃, and the hydraulic retention time of fermented sludge in the fermentation tank HRT=4d After the sludge is fermented, the concentration of the fermentation liquid sludge is MLSS=15560mg / L, 15% of the fermentation liquid is refluxed, and enters the sludge conditioni...

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Abstract

The invention discloses a sludge fermentation-based sewage treatment system and method using an internal carbon source, and belongs to the technical field of sewage treatment. According to the method, primary sludge discharged by a sewage treatment plant is subjected to quenching and tempering treatment to reach a certain concentration, fermentation acid production reaction is performed under fermentation conditions of stirring, temperature control and the like to produce fermentation liquor rich in SCOD and VFAs, and the fermentation liquor can be directly recycled to a denitrification unit of a biological filter to serve as a supplementary carbon source after being subjected to efficient mud-water separation. Therefore, effective recovery of the fermentation liquor is realized, biochemical denitrification of the system is enhanced, and the purposes of reducing the discharge of primary sludge, saving an external carbon source and removing pollutants are achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a sewage treatment system and method based on sludge fermentation and utilizing internal carbon sources. Background technique [0002] With the improvement of the sewage discharge standard of the sewage treatment plant by the ecological environment management department, the sewage treatment plant must further improve the nitrogen and phosphorus removal performance of the sewage. The combination process of high-efficiency sedimentation tank + multi-stage biological filter is a widely used urban sewage treatment process, which can effectively remove carbon, nitrogen, phosphorus and other pollutants in sewage. During the operation of the process, the high-efficiency sedimentation tank unit at the front end removes most of the insoluble organic pollutants in the influent, and the organic matter content in the generated primary sludge is relatively high, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/02C02F11/121
CPCC02F9/00C02F11/02C02F11/121C02F1/5281C02F1/52C02F2001/007C02F3/286C02F3/28
Inventor 杨志宏陈利军安平林王冠平李杰李浙英聂荣
Owner 光大水务科技发展(南京)有限公司
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