Fermentation-separation coupling biological hydrogen-producing method for improving hydrogen-producing fermentation efficiency

Abstract

The invention relates to a fermentation-separation coupling biological hydrogen-producing method for improving hydrogen-producing fermentation efficiency. By the biological hydrogen-producing method, the problem of low efficiency and the like in the conventional process for producing hydrogen biologically by a fermentation method is solved. The fermentation-separation coupling biological hydrogen-producing method comprises the following steps of: introducing organic wastewater into a reactor into which anaerobic hydrogen-producing bacteria are added to perform anaerobic hydrogen-producing fermentation, collecting gaseous products, and separating to obtain the hydrogen; pumping biological hydrogen-producing fermentation liquor in a dilution chamber of a bipolar membrane electrodialyzer circularly; pumping a diluted acetic acid solution in a concentration chamber of the bipolar membrane electrodialyzer circularly; pumping an electrode solution in an anode chamber and a cathode chamber, performing bipolar membrane electrodialysis, and separating organic acid from the biological hydrogen-producing fermentation liquor; and returning the separated fermentation liquor to the reactor for fermenting. By the fermentation-separation coupling biological hydrogen-producing method, the yield of hydrogen can be improved by 1.3 to 1.5 times, the pH value can be controlled to 4.8 to 5.5 without addition of alkali, the utilization rate of substrates is improved by over 50 percent to reach 100 percent, the biomass is improved by 80 percent, the specific hydrogen-producing rate can reach 2.54 molH2/mol glucose, and by the biological hydrogen-producing method, hydrogen production can be promoted greatly.

Description

Technical field [0001] The present invention involves organic wastewater or sewage biological treatment technology, and specially involves the use of organic wastewater for fermentation method biological hydrogen-to improve the fermentation of hydrogen-producing and fermentation. Background technique [0002] In the process of fermentation method biological hydrogen, the growth of hydrogen -producing bacteria and the most suitable pH of hydrogen production is 4.5 ~ 5.5, which generates a large amount of organic acid when generating hydrogen to increase the pH of the fermentation system. At the same timeHydrogen metabolism produces strong suppression, leading to a decrease in production rate, stagnation of metabolism, and incomplete substrate use.The current method generally controls the pH of the fermentation system by investing alkali, while consuming a large amount of alkali, the labor intensity and production costs are also improved accordingly; shortening the hydraulic reside...

AI Technical Summary

Problems solved by technology

[0002] In the process of biological hydrogen production by fermentation, the optimum pH for the growth and hydrogen production of hydrogen-producing bacteria is 4.5-5.5. When hydrogen is produced, a large amount of organic acids are generated, which makes the pH of the fermentation system drop rapidly. Strong inhibition of hydrogen metabolism, resulting in decreased hydrogen production rate, metabolic stagnation, and incomplete substrate utilization

The current method generally controls the pH of the fermentation system by adding alkali. While consuming a large amount of alkali, the labor intensity and production cost are also correspondingly increased; shortening the hydraulic ret

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