Method for promoting anaerobic fermentation of surplus sludge to produce acid by using biosurfactant

A technology of excess sludge and anaerobic fermentation, which is applied in the field of solid waste recycling, can solve the problems of non-biodegradable, chemical surfactant toxicity, etc., and achieve the effects of promoting dissolution, increasing acid production, and high surface activity

Active Publication Date: 2013-09-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that existing chemical surfactants are toxic and non-biodegradable, and propose a method for promoting acid production by anaerobic fermentation of excess sludge using biosurfactant alkyl polyglycosides

Method used

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  • Method for promoting anaerobic fermentation of surplus sludge to produce acid by using biosurfactant
  • Method for promoting anaerobic fermentation of surplus sludge to produce acid by using biosurfactant
  • Method for promoting anaerobic fermentation of surplus sludge to produce acid by using biosurfactant

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Experimental program
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Effect test

Embodiment 1

[0026] In order to determine the optimal conditions for biosurfactant alkyl polyglycosides to promote sludge hydrolysis and acid production, the effects of different dosage and fermentation time on sludge hydrolysis and acid production were discussed.

[0027] (1) Add 100mL of excess sludge to 6 reaction bottles respectively. The total suspended solid concentration of the excess sludge is 28700mg / L, the volatile solid concentration is 11400mg / L, and different amounts are added to bottles 2-6 ( 0.05, 0.1, 0.2, 0.3, 0.4g / gTSS) of alkyl polyglycosides, and bottle No. 1 was set as a blank control group (without adding alkyl polyglycosides).

[0028] (2) After deoxygenating and nitrogenizing the reaction bottle for 10 minutes, seal the reaction bottle, put it in a constant temperature shaking incubator at 30°C for anaerobic fermentation, and complete the biosurfactant alkyl polyglycosides after 48 hours to promote the anaerobic fermentation of the remaining sludge The process of fe...

Embodiment 2

[0030] In order to determine the optimal conditions for biosurfactant alkyl polyglycosides to promote sludge hydrolysis and acid production, the effects of different pH on sludge hydrolysis and acid production were discussed.

[0031] (1) Add 100mL of excess sludge to 8 reaction bottles respectively. The total suspended solid concentration of the excess sludge is 24000mg / L, the volatile solid concentration is 10200mg / L, and the pH values ​​of bottles 1-4 are adjusted to 5 and 7 respectively. , 9 and 11, add 0.2g / gTSS of alkyl polyglycoside, 5-8 is the control group (that is, adjust the pH value to 5, 7, 9 and 11 respectively but do not add alkyl polyglycoside).

[0032] (2) After deoxygenating and nitrogenizing the reaction bottle for 10 minutes, seal the reaction bottle and put it into a constant temperature shaking incubator at 30°C for anaerobic fermentation. The process of oxygen fermentation to produce acid. Depend on figure 2 It can be seen that within the experimenta...

Embodiment 3

[0034] In order to determine the optimal conditions for biosurfactant alkyl polyglycosides to promote sludge hydrolysis and acid production, the effects of different temperatures on sludge hydrolysis and acid production were discussed.

[0035] (1) Add 100mL of excess sludge to 6 reaction bottles respectively. The total suspended solid concentration of the excess sludge is 24000mg / L, the volatile solid concentration is 10200mg / L, and the pH value is adjusted to 9. Dosing in bottles 1-3 Alkyl polyglycoside 0.2g / gTSS, 4-6 is the control group, without adding alkyl polyglycoside.

[0036] (2) After deoxygenating and nitrogenizing the reaction bottle for 10 minutes, seal the reaction bottle and place it in a constant temperature shaking incubator respectively. No. 1 and No. 4 were anaerobically fermented at 15°C, and No. 2 and No. 5 were anaerobically fermented at 25°C. , No. 3 and No. 6 were anaerobically fermented at 35°C, and after 12 hours, the biosurfactant alkyl polyglycosid...

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Abstract

The invention relates to a method for promoting hydrolysis of sludge to produce acid by using a biosurfactant alkyl polyglucoside. The invention aims to solve the problem that the chemical surfactant, which is used in the existing method for promoting anaerobic fermentation of surplus sludge to produce acid by using a chemical surfactant, is toxic and non-biodegradable, and thus, can result in secondary pollution. Secondary sedimentation tank sludge in a sewage treatment plant is used as the raw material to perform anaerobic fermentation under the condition of adding the biosurfactant alkyl polyglucoside. The biosurfactant alkyl polyglucoside used in the method not only has the characteristics in common nonionic and anionic surfactants, but also has the characteristics of high surface activity, favorable ecological safety and high compatibility, and can improve the leaching of organic substances and promote the fermentation of surplus sludge to produce acid. The invention has favorable reference value for practical application and short-chain fatty acid reclamation in the process of sludge hydrolysis to produce acid.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a method for promoting acid production by anaerobic fermentation of excess sludge by using a biosurfactant alkyl polyglycoside. [0002] Background technique [0003] With the further development of sewage treatment technology, the proper disposal of excess sludge has attracted more and more attention. Due to the various disadvantages of sludge disposal methods, more and more people pay more and more attention to the recycling of sludge. The content of organic matter in the remaining sludge is about 60%, and the biodegradable organic component is more than 40%. These biodegradable organic matter are rich sources of nutrients for microorganisms. Sludge treatment and disposal methods include anaerobic digestion, aerobic digestion, etc., and anaerobic digestion is considered to be one of the most cost-effective sludge treatment processes. [0004] In recent years,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
Inventor 孙秀云陈灿王连军沈锦优李健生刘晓东韩卫清黄诚孙夏漪李娜
Owner NANJING UNIV OF SCI & TECH
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