Method for increasing yield of volatile fatty acid in straw anaerobic hydrolysis process

By using the combined treatment of oxygen micro-nano bubble water and anaerobic sludge during the anaerobic hydrolysis of straw, the problem of low volatile fatty acid yield in the prior art is solved, and a significant increase in volatile fatty acid yield is achieved, especially in the content of acetic acid.

CN119685414APending Publication Date: 2025-03-25CHINA AGRI UNIV +1
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Patent Information

Application Number
CN202411907680.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The prior art produces low volatile fatty acids during the anaerobic hydrolysis of straw, and the existing reinforcement methods have problems such as high cost, easy generation of secondary pollutants and complex treatment processes.

Method used

The straw is treated with oxygen micro-nano bubble water and anaerobic sludge. By changing the anaerobic environment during the acid production process, facultative bacterial activity is improved, and by increasing the release of hydrolytic enzymes and the exchange efficiency of nutrients, the straw is promoted.

Benefits of technology

The yield of volatile fatty acids during the anaerobic hydrolysis of straw is significantly improved, especially the content of acetic acid, and the total volatile fatty acid content is increased by 2.9 times and 4.6 times the acetic acid content.

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Abstract

The invention belongs to the technical field of anaerobic acid production, and discloses a method for increasing the yield of volatile fatty acid in a straw anaerobic hydrolysis process, which comprises the following steps of: filling straws into an anaerobic reactor, adding oxygen micro-nano bubble water and anaerobic inoculum, blowing headspace for 1 minute by using nitrogen to keep an anaerobic state, the mass ratio of the straw to the oxygen micro-nano bubble water is (1: 8)-(1: 15), and the oxygen micro-nano bubble water is obtained by filling 20 L of deionized water into a water tank, introducing oxygen according to the flow rate of 1 L / min and operating for 15 minutes. According to the method, oxygen micro-nano bubble water and anaerobic inoculation are jointly used in the straw, nutrient substance exchange and transfer between microorganisms and the external environment are accelerated, the microbial activity can be improved, release of hydrolase is promoted, the hydrolytic acidification process of the straw is accelerated, the organic matter decomposition rate of the microorganisms is increased, and the yield of the straw is increased. The yield of the volatile fatty acid is improved.
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