A method of using alkaloids to strengthen anaerobic digestion of excess sludge to produce methane

A technology of excess sludge and anaerobic digestion, applied in the field of environmental engineering, can solve the problems of low methane production efficiency, low degree, slow hydrolysis and acidification rate, etc., and achieve the effect of increasing methane production, easy degradation, and improving methane production.

Active Publication Date: 2020-07-14
SHANGHAI JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0005] Aiming at technical problems such as slow hydrolysis and acidification rate, low degree and low methane production efficiency in the anaerobic digestion of excess sludge, the present invention provides a method for using alkaloids to strengthen sludge anaerobic digestion to produce methane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Concentrate the remaining sludge from the sewage plant and adjust the solid content to 3%. Inoculate the inoculum sludge with a solid content of 5% from the anaerobic digestion tank into the remaining sludge at a volume percentage of 10%, mix evenly, and inoculate the alkaloids according to The concentration of 0.3mg / L is added to the fermentation mixture. The alkaloids include matrine, choline, and betaine in a ratio of 1:1:1. After mixing evenly, adjust the pH to 6.8 and introduce it into the anaerobic digestion tank. The anaerobic digestion temperature was set at 30°C, and after 28 days of reaction, the cumulative methane production was 2200ml / L. Compared with the control treatment without adding alkaloids, the residence time of anaerobic digested sludge was shortened by 27%, and the final cumulative methane production increased by 43%.

Embodiment 2

[0029] Concentrate the excess sludge from the sewage plant and adjust the solid content to 4%, inoculate the inoculum sludge with a solid content of 3% from the anaerobic digestion tank into the excess sludge at a volume percentage of 50%, mix evenly, and inoculate the alkaloids according to The concentration of 0.6mg / L is added to the fermentation mixture. The alkaloid added is choline. After mixing evenly, adjust the pH to 7.2 and then introduce it into the anaerobic digestion tank. The anaerobic digestion temperature is set at 35°C. After 20 days of reaction, Cumulative methane production is 2500ml / L. Compared with the control treatment without adding alkaloids, the residence time of anaerobic digested sludge was shortened by 30%, and the final cumulative methane production increased by 50%.

Embodiment 3

[0031] Concentrate the excess sludge from the sewage plant and adjust the solid content to 5%, inoculate the inoculum sludge with a solid content of 4% from the anaerobic digestion tank into the excess sludge at a volume percentage of 30%, mix evenly, and inoculate the alkaloids according to Add the concentration of 1.0mg / L to the fermentation mixture. The alkaloid added is matrine. After mixing evenly, adjust the pH to 7.0 and then introduce it into the anaerobic digestion tank. The anaerobic digestion temperature is set at 33°C. After 25 days of reaction , the cumulative methane production is 2350ml / L. Compared with the control treatment without adding alkaloids, the residence time of anaerobic digested sludge was shortened by 25%, and the final cumulative methane production increased by 45%.

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Abstract

The invention provides a method for reinforcing surplus sludge anaerobic digestion methane production through alkaloids. The method comprises S1, settling and concentrating surplus sludge to obtain sludge to be processed; S2, mixing inoculating sludge with the sludge to be processed to obtain a fermentation mixture; S3, uniformly mixing the fermentation mixture obtained in S2 with the alkaloids, adjusting the pH and performing hydrolytic fermentation. Experimental results show that, compared with a control group without the alkaloids, an experimental group added with the alkaloids can shortensthe time of retention of final anaerobic digestion sludge by more than 20% and improve the accumulated yield of methane by more than 40%. According to the method for reinforcing surplus sludge anaerobic digestion methane production through the alkaloids, during a sludge anaerobic digestion initial stage, the alkaloids can eliminate the inhibiting effects of micromolecular organic acids, and through the reductibility, improve the sludge hydrolysis rate and degree and further improve the performance of anaerobic digestion methane production. The method for reinforcing surplus sludge anaerobic digestion methane production through the alkaloids is simple in process, easy to operate and applicable to newly-built sewage plants and technology improvement of existing sewage plants.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and relates to a method for using alkaloids to strengthen anaerobic digestion of excess sludge to produce methane. Background technique [0002] In recent years, with the continuous expansion of the scale of urban domestic sewage treatment in my country, the pressure on urban sewage treatment has become increasingly serious. Sludge, as a by-product in the biological treatment process of urban sewage treatment plants, has attracted increasing attention due to its large output, great harm and high treatment cost. If it cannot be effectively and properly treated, it will easily cause serious pollution to the environment. In addition, sludge is rich in organic matter such as polysaccharides, proteins, and lipids, which can be treated with anaerobic biotechnology to effectively reduce the content of organic matter in sludge and achieve energy recovery through methane production. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCC02F11/04C02F11/12Y02E50/30
Inventor 袁海平俞璐边畅楼紫阳朱南文
Owner SHANGHAI JIAOTONG UNIV
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