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Method of producing acid by combining biosurfactant with iron to promote sludge anaerobic fermentation

An anaerobic fermentation and biological surface technology, which is applied in the field of solid waste recycling to achieve the effects of increasing acid production, increasing acid production and promoting activity

Inactive Publication Date: 2014-12-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the use of surfactants and iron to promote the fermentation of sludge to produce short-chain fatty acids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add the excess sludge into the digestion bottle, drain the supernatant liquid after 24 hours of natural sedimentation, and obtain the excess sludge (PH=6.8) as a substrate for anaerobic fermentation to produce short-chain fatty acids (the same as in the following examples);

[0024] Add alkyl polyglycosides and reduced iron powder to the reaction bottle, the dosages are 0.02g / gTSS and 0.05g / gTSS respectively, and after deoxygenation and nitrogen charging for 5min, the reactor is closed for anaerobic fermentation. Through the action of alkyl polyglycosides, reduced iron powder and microorganisms in the sludge, the organic matter contained in the sludge is converted into short-chain fatty acids. The temperature is controlled at 35±1°C, the pH of the fermentation system varies from 6.0 to 7.0, the residence time of the sludge in the reactor is 5 days, and the content of short-chain fatty acids produced is 1869.28 mg / L.

Embodiment 2

[0026] Add the excess sludge into the digestion bottle, drain the supernatant liquid after 24 hours of natural sedimentation, and obtain the excess sludge (PH=6.8) as a substrate for anaerobic fermentation to produce short-chain fatty acids (the same as in the following examples);

[0027] Add alkyl polyglycosides and reduced iron powder to the reaction bottle, the dosages are 0.05g / gTSS and 0.005g / gTSS respectively, and after 5 minutes of nitrogen and oxygen removal, the closed reactor is used for anaerobic fermentation. Through the action of alkyl polyglycosides, reduced iron powder and microorganisms in the sludge, the organic matter contained in the sludge is converted into short-chain fatty acids. The temperature is controlled at 35±1°C, the pH of the fermentation system varies from 6.0 to 7.0, the residence time of the sludge in the reactor is 5 days, and the content of short-chain fatty acids produced is 2575.62mg / L.

Embodiment 3

[0029] Add the excess sludge into the digestion bottle, drain the supernatant liquid after 24 hours of natural sedimentation, and obtain the excess sludge (PH=6.8) as a substrate for anaerobic fermentation to produce short-chain fatty acids (the same as in the following examples);

[0030] Add alkyl polyglycosides and reduced iron powder to the reaction bottle, the dosages are 0.05g / gTSS and 0.05g / gTSS respectively, and after 5 minutes of nitrogen and oxygen removal, the closed reactor is carried out for anaerobic fermentation. Through the action of alkyl polyglycosides, reduced iron powder and microorganisms in the sludge, the organic matter contained in the sludge is converted into short-chain fatty acids. The temperature is controlled at 35±1°C, the pH of the fermentation system varies from 6.0 to 7.0, the residence time of the sludge in the reactor is 5 days, and the content of short-chain fatty acids produced is 2630.98mg / L.

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Abstract

The invention belongs to the field of solid waste recycling and particularly relates to a method of producing acid by combining a biosurfactant with iron to promote sludge anaerobic fermentation. The method comprises the following steps: adding iron and the biosurfactant into a sludge sample, charging the nitrogen gas into a reactor to expel the oxygen gas, sealing the reactor, uniformly mixing substances of a reaction system, controlling a fermentation temperature and carrying out anaerobic fermentation. By sufficient utilizing the characteristics of the iron and the biosurfactant, the method can be used for effectively reducing the sludge, reducing the pollution on the environment and recycling the sludge to produce short-chain fatty acid with a high utilization value.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a method for promoting the fermentation of excess sludge to produce acid by using biosurfactant alkyl polyglycosides and iron. Background technique [0002] While the biological method is widely used in urban sewage treatment plants, a large amount of sludge is produced, and its output accounts for about 0.3-0.5% of the treated water (calculated with a water content of 97%). The rapid growth of sludge output will inevitably bring about serious secondary pollution. However, the cost of sludge treatment is very high, accounting for more than 50% of the operating cost of the sewage treatment plant, which has become a major burden on the operation of the sewage treatment plant. Today, with the simultaneous development of economic construction and environmental protection, conventional sludge treatment and disposal methods can no longer meet the requirements. Reasonabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
Inventor 孙秀云李娜王连军沈锦优李健生刘晓东韩卫清黄诚刘聪聪
Owner NANJING UNIV OF SCI & TECH
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