Chengdu Institute of Biology, Chinese Academy of Sciences “a method of regulating the fermentation process of biogas†obtained the invention patent of the State Intellectual Property Office (patent number: ZL 201310440319.1).
The biogas fermentation process has been widely used to treat various organic wastes, and relatively clean biogas energy is obtained. Finally, biogas slurry and other organic fertilizers can also be obtained. With the large-scale development of biogas projects, more and more large-scale or extra-large biogas projects will be built. For large-scale or extra large-scale biogas projects with huge investment and high expected economic benefits, a high rate of gas production from the pool and a stable fermentation process are crucial. However, these two goals are in conflict with each other.
Therefore, it is necessary to study the selection of other more reliable and timely monitoring indicators of the biogas fermentation process. At the same time, it is necessary to study the use of a more timely and effective method of regulation and control, which not only ensures a higher gas production rate in the pool, but also avoids Biogas fermentation system has serious acidification (unbalance).
Researchers at Chengdu Institute of Biology aim to overcome the deficiencies in the existing technologies by gradually increasing the organic loading rate, adding raw materials to the biogas fermentation system, and passing the ratio of pH daily drop, acetic acid concentration/propionic acid concentration (P/A). ), The ratio of volatile fatty acid alkalinity/bicarbonate alkalinity (IA/BA) values ​​are periodically monitored to determine the operating stability of the biogas fermentation system. When the system is determined to be unstable, by adjusting the amount of feed or adding After the acidified biogas fermentation system recovers the gas-producing composite biological preparations, the biogas fermentation system is again stabilized, and then the organic load rate is gradually increased, and then whether the biogas fermentation system is in a stable state is monitored. This cycle regulates and increases the organic load rate until the system stabilizes to the maximum allowable organic load rate feed. The invention can make the biogas fermentation system operate under a higher organic loading rate condition and obtain a higher gas production rate of the pool capacity.
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