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Method for promoting anaerobic fermentation acid production of excess sludge through surfactin

A technology of surfactin and excess sludge, applied in fermentation, biological sludge treatment, etc., can solve the problems of insufficient improvement of anaerobic acid production effect and poor biodegradability, and achieve good promotion effect and easy biodegradation , good surface activity effect

Inactive Publication Date: 2014-04-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, some researchers have found that the presence of chemical surfactants in excess sludge can increase the hydrolysis rate of excess sludge and increase the production of short-chain fatty acids. Unfavorable effects, and only using chemical surfactants (such as sodium dodecyl sulfate or sodium dodecylbenzenesulfonate) to improve the anaerobic acid production effect of residual sludge is not significant enough

Method used

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  • Method for promoting anaerobic fermentation acid production of excess sludge through surfactin
  • Method for promoting anaerobic fermentation acid production of excess sludge through surfactin
  • Method for promoting anaerobic fermentation acid production of excess sludge through surfactin

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Let the remaining sludge settle at 4°C for 12-24 hours until the concentration of the concentrated sludge in the lower layer is between 10-20g / L, remove the supernatant, and take 300mL of concentrated sludge into a 1L anaerobic fermentation tank ;

[0026] With the supernatant obtained in the previous step, surfactin was dissolved and formulated into a concentration of 40g / L;

[0027] According to the actual concentration of the concentrated sludge, add surfactin to the fermenter according to the dose of 0.01g (surfactin) / g (dry sludge), and mix quickly and evenly;

[0028] Feed 10 times of the tank volume of nitrogen into the fermenter to remove the oxygen in the tank, then start to carry out anaerobic fermentation to the remaining sludge, and keep the fermenter airtight during the anaerobic fermentation process;

[0029] During the fermentation process, the temperature in the fermenter is maintained between 28-30°C, the mixing speed is between 100-120rpm, and the fer...

Embodiment 2

[0033] Let the remaining sludge settle at 4°C for 12-24 hours until the concentration of the concentrated sludge in the lower layer is between 10-20g / L, remove the supernatant, and take 300mL of concentrated sludge into a 1L anaerobic fermentation tank ;

[0034] With the supernatant obtained in the previous step, surfactin was dissolved and formulated into a concentration of 40g / L;

[0035] According to the actual concentration of the concentrated sludge, add surfactin to the fermenter according to the dose of 0.02g (surfactin) / g (dried sludge), and mix quickly and evenly;

[0036] Feed 10 times of the tank volume of nitrogen into the fermenter to remove the oxygen in the tank, then start to carry out anaerobic fermentation to the remaining sludge, and keep the fermenter tightly closed during the anaerobic fermentation process;

[0037] During the fermentation process, the temperature in the fermenter is maintained between 28-30°C, the mixing speed is between 100-120rpm, and...

Embodiment 3

[0041] Let the remaining sludge settle at 4°C for 12-24 hours until the concentration of the concentrated sludge in the lower layer is between 10-20g / L, remove the supernatant, and take 300mL of concentrated sludge into a 1L anaerobic fermentation tank ;

[0042] With the supernatant obtained in the previous step, surfactin was dissolved and formulated into a concentration of 40g / L;

[0043] According to the actual concentration of the concentrated sludge, add surfactin to the fermenter according to the dose of 0.05g (surfactin) / g (dried sludge), and mix quickly and evenly;

[0044]Feed 10 times of the tank volume of nitrogen into the fermenter to remove the oxygen in the tank, then start to carry out anaerobic fermentation to the remaining sludge, and keep the fermenter airtight during the anaerobic fermentation process;

[0045] During the fermentation process, the temperature in the fermenter was maintained between 28 and 30°C, the mixing and stirring speed was between 100...

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Abstract

The invention relates to a method for promoting anaerobic fermentation acid production of excess sludge through lipopeptide biosurfactant, namely surfactin. The existing chemical surfactant cannot obviously improve anaerobic fermentation acid production effect of residual sludge, is relatively poor in biodegradability and easily results in secondary pollution. The surfactin adopted by the invention is a microorganism fermentation product which has the characteristics of being low in toxicity, easily biodegradable, and capable of keeping excellent surface activity within large temperature and pH value ranges and the like; and the surfactin cannot generate secondary pollution to the environment, is capable of obviously promoting anaerobic fermentation acid production of residual sludge, is high in acid yield, and capable of favorably promoting anaerobic fermentation acid production of the residual sludge with relatively low dosage.

Description

technical field [0001] The invention relates to a method for promoting acid production by anaerobic fermentation of excess sludge by using lipopeptide biosurfactant-surfactin. Background technique [0002] At present, domestic sewage treatment plants mostly use the activated sludge method for sewage treatment. However, the activated sludge method will produce a large amount of excess sludge. The cost of its treatment and disposal is high, and improper disposal will have a serious impact on the environment. Anaerobic digestion of sludge is currently a widely used method for sludge stabilization and resource utilization, and because sludge contains a large amount of organic matter such as protein and polysaccharides, some researchers have also used these biomass in sludge in recent years Volatile fatty acids (VFAs) are produced from resources through anaerobic fermentation, and this product can be used as a high-quality carbon source for the production of biopolymer materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40C02F11/04
Inventor 黄翔峰刘佳陆丽君申昌明冯夷
Owner TONGJI UNIV
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