Method for promoting residual sludge to be anaerobically fermented to produce acid by utilizing tea saponin

A technology of excess sludge and anaerobic fermentation, applied in fermentation and other directions, can solve the problems of insufficient improvement of anaerobic acid production effect, high cost of microbial fermentation, poor biodegradability, etc. Simple effects of industrial extraction methods

Inactive Publication Date: 2014-05-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
In addition, some researchers have used rhamnolipids synthesized by microbial metabolism to promote the anaerobic fermentation of excess sludge to produce acid. However, the cost of microbial fermentation is relatively high, and it is not economical compared with chemical surfactants.

Method used

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  • Method for promoting residual sludge to be anaerobically fermented to produce acid by utilizing tea saponin
  • Method for promoting residual sludge to be anaerobically fermented to produce acid by utilizing tea saponin
  • Method for promoting residual sludge to be anaerobically fermented to produce acid by utilizing tea saponin

Examples

Experimental program
Comparison scheme
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 that last step obtains, tea saponin is dissolved and formulated into the concentration of 40g / L;

[0027] According to the actual concentration of the concentrated sludge, add tea saponin to the fermenter according to the dosage of 0.02g (tea saponin) / g (dried sludge), and mix quickly and uniformly;

[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 ...

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 that last step obtains, tea saponin is dissolved and formulated into the concentration of 40g / L;

[0035] According to the actual concentration of the concentrated sludge, add tea saponin to the fermenter according to the dosage of 0.05g (tea saponin) / g (dry sludge), and mix quickly and uniformly;

[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 airtight 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 th...

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 that last step obtains, tea saponin is dissolved and formulated into the concentration of 40g / L;

[0043] According to the actual concentration of the concentrated sludge, add tea saponin to the fermenter according to the dosage of 0.10g (tea saponin) / g (dry sludge), and mix quickly and uniformly;

[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 is maintained between 28-30°C, the mixing speed is between 100-120rpm, and th...

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Abstract

The invention relates to a method for promoting residual sludge to be anaerobically fermented to produce acid by utilizing tea saponin. The existing chemical surface active agent is poor for improving the anaerobic acid production effect of the residual sludge, the chemical surface active agent is poor in biological degradation property and easy for causing the secondary pollution, and the cost of the biological surface active agent synthesized through the microbial metabolism is high. The tea saponin is a plant extract, the effect on promoting the anaerobic fermentation and acid production of the residual sludge is remarkable, the acid yield is high, the secondary pollution on the environment is avoided, the raw material is widely sourced, the cost is low, and the large-scale application in the anaerobic fermentation acid production process of the residual sludge can be realized.

Description

technical field [0001] The invention relates to a method for promoting acid production by anaerobic fermentation of excess sludge by using tea saponin (TS, Tea Saponin). 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 (PHA) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/40
Inventor 黄翔峰陆丽君刘佳申昌明
Owner TONGJI UNIV
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