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Method for promoting anaerobic fermentation of excess sludge by combining copper sulfate and alkaline pH to produce short-chain fatty acid

A short-chain fatty acid and excess sludge technology, applied in the direction of fermentation, can solve the problem of high treatment and disposal costs, and achieve the effects of improving hydrolysis efficiency and shortening anaerobic fermentation time.

Active Publication Date: 2015-04-22
BEIJING UNIV OF TECH
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Problems solved by technology

On the one hand, the serious shortage of carbon sources in urban domestic sewage has become one of the main limiting factors for the deep denitrification and phosphorus removal of sewage treatment plants; A large amount of excess sludge will be generated, and the treatment and disposal costs are relatively high

Method used

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Embodiment

[0025] The remaining sludge was left to settle at room temperature (20-25°C) for 6 hours, and the total suspended solids concentration (mixed liquid suspended solids, MLSS) of the concentrated sludge in the lower layer was adjusted to 10098mg / L. Take 1L of mud-water mixture to a volume of 1L Let stand in the beaker for 10min, take 10mL supernatant;

[0026] Use the supernatant obtained in the previous step to dissolve copper sulfate and add it to the beaker. The dosage of copper sulfate is 0.62mgCu 2+ / gVSS, stirring and soaking at room temperature for 24 hours, the mixing speed is 100-120rpm;

[0027] Use deionized water to elutriate the remaining sludge that has been stirred and soaked with copper sulfate until no copper ions exist;

[0028] Take 200mL of the remaining sludge anaerobic fermentation mixture cultivated for a long time under the conditions of 30±2°C and pH=10±0.5, the anaerobic fermentation time is more than 60d, and the sludge residence time is 8-10d. Contro...

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Abstract

The invention discloses a method for promoting anaerobic fermentation of excess sludge by combining copper sulfate and alkaline pH to produce short-chain fatty acid and belongs to the technical field of environmental protection. According to the method, the excess sludge in a municipal wastewater treatment plant is used as the raw material; firstly, the copper sulfate is added to make the walls of microorganisms in the excess sludge break; secondly, the excess sludge is washed to remove copper ions; lastly, the pH value of the excess sludge is adjusted to be alkaline for anaerobic fermentation. After the excess sludge is pretreated through the copper sulfate, the hydrolysis rate is increased in the anaerobic fermentation process, and the yield of the short-chain fatty acid is increased; besides, the alkaline pH further promotes wall breakage of the microorganisms in the excess sludge and effectively suppresses the activity of methane bacteria produced in the anaerobic fermentation process, so that organic matter in the excess sludge is converted into the short-chain fatty acid to the maximum extent, and meanwhile the short-chain fatty acid is prevented from being converted into methane and is accumulated. The copper sulfate adopted in the method can effectively promote anaerobic fermentation of the excess sludge to produce the short-chain fatty acid at a small dosage, and meanwhile the effect of sludge reduction is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for promoting the anaerobic fermentation of excess sludge to produce short-chain fatty acids by using copper sulfate combined with alkaline pH. Background technique [0002] At present, most urban sewage treatment plants use the activated sludge method to treat sewage. On the one hand, the serious shortage of carbon sources in urban domestic sewage has become one of the main limiting factors for the deep denitrification and phosphorus removal of sewage treatment plants; A large amount of excess sludge will be produced, and the treatment and disposal costs are relatively high. The remaining sludge contains a large amount of organic matter such as protein and polysaccharide, which can be converted into short-chain fatty acids through anaerobic fermentation technology, and used as a high-quality carbon source for microbial nitrogen and phosphorus removal. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
CPCC12P7/40
Inventor 王淑莹刘晔袁悦马斌彭永臻
Owner BEIJING UNIV OF TECH
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