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Method for producing methane by reinforcing anaerobic fermentation of cow dung through heat-alkali combined pretreatment

An anaerobic fermentation and pretreatment technology, applied in the field of solid waste recycling, can solve problems such as low methane production efficiency, and achieve the effects of simple operation method, improved efficiency and reduced odor

Pending Publication Date: 2021-09-14
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problem of low methane production efficiency of insoluble organic substances such as hemicellulose, cellulose and lignin in cow dung, and provides a method for improving the methane production of cow dung by combined thermal alkali pretreatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 300ml of cow dung to a 500ml reactor, control the initial pH to 6.8-7.2, add 100ml of anaerobic granular sludge so that the VS ratio of anaerobic granular sludge to cow dung is 1:2, and the water content after mixing is About 6%, the anaerobic fermentation temperature is controlled to be 35±1°C, the stirring speed is 150rpm, the residence time of cow dung in the reactor is 8 days, the anaerobic fermentation is 10 days, and the methane output is 0.57 liters.

Embodiment 2

[0036] Add 300ml of cow dung to a 500ml reactor, heat pretreatment at 110°C for 1 hour, then control the initial pH to 6.8-7.2, add 100ml of anaerobic granular sludge to make the anaerobic granular sludge and cow dung The VS ratio is 1:2, and the water content after mixing is about 6%. day, methane production was 0.64 liters.

Embodiment 3

[0038] Add 300ml of cow dung to a 500ml reactor, add 0.05g of alkaline reagent per gram of cow dung volatile organic solids, pretreat for 1 hour at room temperature, then control the initial pH to 6.8-7.2, add 100ml For anaerobic granular sludge, the VS ratio of anaerobic granular sludge to cow dung is 1:2, and the water content after mixing is about 6%. The residence time in the reactor was 8 days, the anaerobic fermentation was 10 days, and the methane production was 0.68 liters.

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PUM

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Abstract

The invention belongs to the technical field of solid waste recycling, and relates to a method for producing producing methane by reinforcing anaerobic fermentation of cow dung through heat-alkali combined pretreatment. According to the method, after the cow dung is subjected to alkali pretreatment, degradation of refractory organics such as hemicellulose, cellulose and lignin which are not completely digested in the cow dung can be increased; and heat pretreatment is carried out while the alkali pretreatment is carried out, so the dissolution of organic matters such as protein and polysaccharide in the cow dung in water can be remarkably improved, and a large amount of soluble organic matters are provided for acid production and methane production stages of anaerobic fermentation of the cow dung. According to the method, the content of soluble organic matters can be increased by utilizing the heat-alkali combined pretreatment of the cow dung, and methane yield can be maximized.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource utilization, and relates to a method for enhanced anaerobic fermentation of methane by thermal alkali combined pretreatment of cow dung. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The total amount of livestock and poultry manure produced in the country is nearly 400 million tons every year, and the chemical oxygen demand of livestock and poultry farming emissions is 12.68 million tons, accounting for 96% of the total emissions from agricultural sources, which is an important cause of agricultural non-point source pollution. As of 2020, the comprehensive utilization rate of liv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/18C02F11/04C05F3/00C02F103/20C02F101/30
CPCC02F11/00C02F11/18C02F11/04C05F3/00C02F2103/20C02F2101/30C02F2303/04Y02A40/20
Inventor 何德明尹志轩刘长青孔令营靖陆
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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