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Method for promoting anaerobic co-fermentation of cow dung and straw

A cow dung straw, co-fermentation technology, applied in fermentation, biological sludge treatment, waste fuel and other directions, can solve the problems of long fermentation cycle, difficult to start direct anaerobic fermentation, etc., to improve the methane content, shorten the fermentation cycle, promote The effect of efficiency

Pending Publication Date: 2021-12-07
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when animal manure, especially cow manure with low organic carbon and nitrogen content, is used as the substrate, there are defects that direct anaerobic fermentation is not easy to start and the fermentation cycle is long.

Method used

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  • Method for promoting anaerobic co-fermentation of cow dung and straw
  • Method for promoting anaerobic co-fermentation of cow dung and straw
  • Method for promoting anaerobic co-fermentation of cow dung and straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Adopt 500mL Erlenmeyer flask as reactor, seal by rubber stopper and glass glue, reaction device such as figure 1 shown.

[0044] 1. Preparation of alkaline biogas slurry:

[0045] The above-mentioned cow dung and corn stalks were mixed for anaerobic co-fermentation at a ratio of 9:1, with diatomaceous earth as an additive, and the addition amount was 8% of the total solid content of cow dung and corn stalks. After the acidification stage ended (the 7th day) Add an appropriate amount of sodium bicarbonate (30mL), adjust the pH value of the system to neutral (pH=7), and introduce EM bacterial liquid (EM bacterial liquid was purchased from Anhui Guangyu Biotechnology Co., Ltd.; Bacteria, Bacillus, Enterococcus faecalis and acetic acid bacteria), the addition amount is 10% of the total mixture mass, and alkaline biogas slurry is obtained at the end of anaerobic fermentation (28 days).

[0046] 2. Co-fermentation of cow dung and corn straw:

[0047]First, soak corn stalks...

Embodiment 2

[0052] The gas production performance of embodiment 2 anaerobic fermentation system

[0053] figure 2 It is the graph of daily biogas production and daily methane production, among which, graph A is the daily biogas production, and graph B is the daily methane production.

[0054] Depend on figure 2 A It can be seen that the maximum single-day gas production of the biochar group is 8% C, and the gas production is 17.48mL / g VS on the fifth day. From the perspective of the gas production cycle, the anaerobic fermentation cycle was significantly shortened after the addition of biochar: the blank control group without biochar ended on the 40th day of anaerobic fermentation, and the biochar group reacted on the 22nd to 26th day of reaction. Finish. Adding 6% and 8% biochar had the most obvious effect on shortening the period, both of which ended on the 22nd day, and adding 2% biochar ended on the 26th day, which also had a more obvious effect of promoting the rate of anaerobic...

Embodiment 3

[0061] pH and conductivity of embodiment 3 anaerobic fermentation system

[0062] Figure 5 is the change of pH in the anaerobic fermentation system. From the perspective of pH, 30mL of saturated sodium bicarbonate was added to the CK group to increase the pH from 5.33 to 7.03 neutral. On the seventh day, it reached a phased maximum pH of 7.5, and at the same time reached the peak of gas production on the seventh day, reaching the gas production The pH gradually decreased after the peak, reaching 7.18 on the 16th day. Finally, at the end of the anaerobic fermentation reaction, it gradually increased to 8.26. Because the pH was too high, it was not conducive to the growth of methanogens, and the anaerobic fermentation gas production ended. The pH of the experimental group eventually approached 6.8. Since the biochar experimental group added alkaline biogas slurry containing methanogenic bacteria, it was easier to promote the system start-up after being added to the system. A...

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Abstract

The invention discloses a method for promoting anaerobic co-fermentation of cow dung and straw, and belongs to the technical field of anaerobic fermentation. The method specifically comprises the following steps: mixing cow dung, straw and biochar, adding water to adjust the solid content to 9%, carrying out a sealed reaction on the obtained mixture at 35+ / -1 DEG C for 72-96 h, adding an alkaline biogas slurry containing a strain into the reaction system, adjusting the pH value of the system to the pH value of anaerobic fermentation of the strain, and carrying out anaerobic co-fermentation of cow dung and straw. According to the method disclosed by the invention, the corn straws pretreated by an alkaline method are added into an anaerobic co-fermentation system taking the cow dung as a main raw material, so that the treated straws are more easily utilized by hydrolytic bacteria; and meanwhile, the biochar is added into the anaerobic co-fermentation system, so that the anaerobic fermentation efficiency can be improved, and the fermentation period can be shortened.

Description

technical field [0001] The invention relates to the technical field of anaerobic fermentation, in particular to a method for promoting anaerobic co-fermentation of cow dung and straw. Background technique [0002] Organic waste accounts for a large proportion of the total waste generated worldwide, such as the organic fraction of municipal solid waste, wastewater treatment sludge, rural and forest residues, etc. Organic waste treatment refers to the use of physical, chemical and biological methods to treat organic waste and its pollutants, so as to reduce environmental pollution and even turn waste into treasure. There are many ways to treat organic waste, including anaerobic fermentation, aerobic composting, and sanitary landfill. [0003] Anaerobic digestion (AD) is an efficient biochemical pathway to convert organic solid waste and wastewater into energy and valuable products. The AD process produces biogas, which can be converted into heat and power, and the remaining ...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04C02F103/20
CPCC12P5/023C02F11/04C02F2103/20Y02E50/30
Inventor 徐建玲王汉席孙寄添
Owner NORTHEAST NORMAL UNIVERSITY
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