Method for producing methane by sludge

A sludge and methane technology, applied in biological sludge treatment, waste fuel, etc., can solve the problem of low methane efficiency, reduce pollution, fully recover and reuse, and increase production.

Active Publication Date: 2010-02-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of low methane production efficiency of sludge, and provides a method for producing methane from sludge that significantly increases methane output on the basis of simultaneously improving sludge hydrolysis and hydrolyzed acid production effects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 32L of sludge to 8 identical 6L reactors on average (the reactors are made of plexiglass, with an inner diameter of 150mm, a height of 350mm, and a cylindrical shape), and the pH is controlled at 4, 5, 6, 7, 8, and 9 respectively. , 10, after 4, 6, 8, 10, 12 days of hydrolysis acid production process, temperature 21 ℃, stirring speed 80r / min. The optimum condition for hydrolysis and acid production was found to be pH=10, and after 8 days, the maximum concentration of short-chain fatty acids was 2957mg / L.

Embodiment 2

[0026] 16L of sludge was added to four identical 6L reactors on average, and the pH was controlled at 10. After 8 days of hydrolysis and acid production, the temperature was 21 ° C, and the stirring speed was controlled at 40, 60, 80, and 100 r / min. The optimum condition of acid hydrolysis was measured when the stirring speed was 80r / min, and the maximum concentration of short-chain fatty acids was 2957mg / L.

Embodiment 3

[0028] Add 4L of sludge into a 6L reactor, stir for 8 days under the conditions of pH 6 and temperature 21°C, and the measured concentration of short-chain fatty acids is 522.3mg / L. Then the temperature of the reactor was controlled at 35° C., and the pH of the mixture was adjusted to 7, and then 0.5 L (12.5%) anaerobic granular sludge was inoculated. After stirring for 8 days, the amount of methane measured was 7.1 L.

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Abstract

The invention relates to an application of sludge as a source and discloses a method for producing methane by sludge, comprising the following steps: carrying out the anaerobic fermentation of the sludge under the alkali condition for 4-12 days so as to hydrolyze the sludge and acidate a hydrolyzed sludge solution; adjusting the pH value of the fermented mixture to be neutral, adding 8-15V% anaerobic granular sludge in the fermented mixture and continuously carrying out anaerobic fermentation at 30-40 DEG C for 6-14 days to generate methane. The method for producing methane by sludge not onlyobviously improves the yield of the methane produced by sludge, but also is beneficial to reducing the sludge pollution to the environment.

Description

technical field [0001] The invention relates to resource utilization of sludge, in particular to a method for producing methane from sludge. Background technique [0002] The activated sludge method is widely used to treat wastewater, and the biological treatment technology of the resulting waste activated sludge is also widely studied (for example, the literature Journal of Bioscience and Bioengineering, 2000, 89, 145-150; Water research, 2000 , 34, 725-734). The activated sludge process has been widely used in the treatment of industrial wastewater and domestic sewage for a long time, so some countries have established programs to recycle and reuse the remaining activated sludge (eg, as nutrients applied to the land). But this will cause secondary pollution to the environment, because in addition to a large amount of organic matter, rich nitrogen, phosphorus and other nutrients in the sludge, there are other toxic and harmful components such as pathogenic bacteria, parasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 陈银广张栋叶正祥赵玉晓冀周英朱晓宇
Owner TONGJI UNIV
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