利用电化学活跃微生物协助电解发酵产氢

Electrochemically active microorganisms and electrolytically assisted fermentative hydrogen production - A review

摘要:

摘要：电解协助发酵产氢是在外源电解协助下，利用电化学活跃微生物在石墨阳极上生长达到彻底氧化因发酵产氢残存的有机酸，产生CO2、电子与质子，电子进入石墨阳极经导线传到铂阴极，而质子则穿过阳离子膜进入阴极池，在无氧环境下，通过外加电压和铂的催化下，电子与质子结合为氢。此过程电子回收率可达90%以上，产氢效率可达8-9mol H2/mol Glucose。这一战略从根本上克服发酵产氢的发酵障碍和代谢产物的反馈抑制，极大地提高了氢转化率，极有可能率先应用于能源作物原料的氢能转化、以及有机污水和有机废弃物处理。

Abstract:

Abstract: Fermentative hydrogen production can be improved by electrolysis and electrochemically active microorganisms which are capable of using an electrode as an electron acceptor for the oxidation of organic matter, in particular, volatile acids produced after fermentation. Firstly volatile acids can be completely converted into CO2, electrons and protons on the surface of anode. Then the electrons flow to cathode through anode and wires, and at the same time the protons move to cathode through cation membrane between anode chamber and cathode chamber. Finally the electrons and the protons combine into hydrogen when they meet at the surface of cathode. In such a process, the fermentation barrier and the product inhibition can be avoided to improve the conversion of hydrogen. 8-9mol H2/mol glucose of hydrogen potential can be obtained when glucose is used as substrate. This technology is very likely to be applied to produce hydrogen high efficiently from any energy crops, organic waste and wastewater.