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Method for promoting hydrolysis and fermentation of excess sludge and simultaneously utilizing fermentation product in situ

A technology for excess sludge and fermentation products, applied in water/sludge/sewage treatment, water pollutants, sludge treatment, etc.

Pending Publication Date: 2022-05-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for promoting the hydrolysis and fermentation of excess sludge while utilizing fermentation products in situ, which belongs to the technical field of excess sludge biochemical treatment and sewage treatment, and can solve the problem of speed limit and denitrification carbon in excess sludge treatment source shortage problem

Method used

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  • Method for promoting hydrolysis and fermentation of excess sludge and simultaneously utilizing fermentation product in situ
  • Method for promoting hydrolysis and fermentation of excess sludge and simultaneously utilizing fermentation product in situ
  • Method for promoting hydrolysis and fermentation of excess sludge and simultaneously utilizing fermentation product in situ

Examples

Experimental program
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Effect test

Embodiment example 1

[0030] ⅠAdding mud: the fermentation substrate in the mud storage tank (4) is taken from the remaining sludge in the secondary sedimentation tank of the urban sewage treatment plant, and after standing at 4°C for 48 hours, the supernatant is removed to obtain a sludge sample; The mud pump (3) makes the sludge total suspended solid concentration in the sludge anaerobic fermentation system (5) be 9.2g / L, and the volatile suspended solid concentration be 5.8g / L.

[0031] II Influent water: The influent water tank (1) is artificially prepared nitrate-nitrogen wastewater. By controlling the raw water inlet pump (2), the concentration of nitrate-nitrogen wastewater in the sludge anaerobic fermentation system (5) is 100mg / L.

[0032] Ⅲ Air intake: fill the sludge anaerobic fermentation system (5) with N for 5min through the intake valve (21) 2 , to remove oxygen from the reactor.

[0033] Ⅳ Anoxic stirring: keep the airtight state of the sludge anaerobic fermentation system (5), adj...

Embodiment example 2

[0040] ⅠAdding mud: the fermentation substrate in the mud storage tank (4) is taken from the remaining sludge in the secondary sedimentation tank of the urban sewage treatment plant, and after standing at 4°C for 48 hours, the supernatant is removed to obtain a sludge sample; The mud pump (3) makes the sludge total suspended solid concentration in the sludge anaerobic fermentation system (5) be 9.2g / L, and the volatile suspended solid concentration be 5.8g / L.

[0041] II Influent water: The influent water tank (1) is artificially prepared nitrate-nitrogen wastewater. By controlling the raw water inlet pump (2), the concentration of nitrate-nitrogen wastewater in the sludge anaerobic fermentation system (5) is 200mg / L.

[0042] Ⅲ Air intake: fill the sludge anaerobic fermentation system (5) with N for 5min through the intake valve (21) 2 , to remove oxygen from the reactor.

[0043] Ⅳ Anoxic stirring: keep the airtight state of the sludge anaerobic fermentation system (5), adj...

Embodiment example 3

[0050] ⅠAdding mud: the fermentation substrate in the mud storage tank (4) is taken from the remaining sludge in the secondary sedimentation tank of the urban sewage treatment plant, and after standing at 4°C for 48 hours, the supernatant is removed to obtain a sludge sample; The mud pump (3) makes the sludge total suspended solid concentration in the sludge anaerobic fermentation system (5) be 9.2g / L, and the volatile suspended solid concentration be 5.8g / L.

[0051] II Influent water: the nitrate-nitrogen wastewater is artificially prepared in the water inlet tank (1). By controlling the raw water inlet pump (2), the concentration of nitrate-nitrogen wastewater in the sludge anaerobic fermentation system (5) is 400mg / L.

[0052] Ⅲ Air intake: fill the sludge anaerobic fermentation system (5) with N for 5min through the intake valve (21) 2 , to remove oxygen from the reactor.

[0053] Ⅳ Anoxic stirring: keep the airtight state of the sludge anaerobic fermentation system (5),...

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Abstract

The invention discloses a method for promoting hydrolysis and fermentation of excess sludge and simultaneously utilizing a fermentation product in situ, and belongs to the field of excess sludge biochemical treatment and sewage treatment. The method specifically comprises the following steps: taking residual sludge of a secondary sedimentation tank of a municipal sewage treatment plant as a fermentation substrate, standing and precipitating, and then removing supernate to obtain a sludge sample; and pumping into an anaerobic fermentation system to be mixed with the high-nitrate-nitrogen wastewater, filling N2 for 5 minutes, and carrying out anaerobic fermentation under the conditions that the initial pH is 6.5-7.5 and the temperature is 35 + / -2 DEG C. In the anaerobic fermentation system, the residual sludge is mixed with the high-nitrate-nitrogen wastewater, so that the decomposition and hydrolysis of the residual sludge can be promoted, the reduction treatment of the sludge is realized, and the removal of nitrogen in the sewage is enhanced. The method is simple to operate, the sludge is treated according to the characteristic that the content of volatile solid substances in the excess sludge is high, the speed limiting step of sludge treatment is relieved, in-situ utilization of endogenous organic matters in the sludge is achieved, sludge treatment recycling is achieved, and sustainable significance is achieved.

Description

Technical field: [0001] The invention belongs to the technical field of excess sludge biochemical treatment and sewage treatment, and relates to a method for promoting the hydrolysis and fermentation of excess sludge and utilizing fermentation products in situ. The present invention uses the excess sludge produced in the secondary sedimentation tank of the urban sewage treatment plant as the fermentation substrate, and the volatile fatty acids produced by the fermentation are used as the electron donors of the denitrifying bacteria, so as to realize the treatment of the excess sludge and the recovery and utilization of energy, and solve the problem of Difficult extraction of carbon source in sludge and insufficient denitrification carbon source. Background technique: [0002] The effective treatment and disposal of excess sludge has always been a concern, and the treatment cost of excess sludge accounts for about 60% of the total operating cost of sewage treatment plants. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/282C02F2101/163C02F2203/006C02F2209/005C02F2209/06C02F2209/04C02F2209/08C02F2209/18C02F2209/14C02F2303/06Y02W10/20
Inventor 彭永臻李笑迪王博马雨晴江潭王硕汪文
Owner BEIJING UNIV OF TECH
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