Bosman Catharine Elizabeth, van Wyk Petrie, Pott Robert William McClelland, Bradshaw Steven Martin
Department of Process Engineering, Stellenbosch University, Banghoek Road, Stellenbosch, 7600, South Africa.
Department of Process Engineering, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch, 7602, South Africa.
AMB Express. 2023 Mar 3;13(1):26. doi: 10.1186/s13568-023-01534-x.
Hydrogen production via microbial photofermentation shows great promise as a method for sustainable hydrogen production; however, operating costs associated with photofermentative hydrogen production need to be reduced. Costs can be reduced using a passive circulation system like the thermosiphon photobioreactor, and by operating it under natural sunlight. In this study, an automated system was implemented to investigate the effect of diurnal light cycles on the hydrogen productivity and growth of Rhodopseudomonas palustris and on the operation of a thermosiphon photobioreactor, under controlled conditions. Diurnal light cycles, simulating daylight times, were found to reduce hydrogen production in the thermosiphon photobioreactor demonstrating a low maximum production rate of 0.015 mol m h (± 0.002 mol m h) as compared to 0.180 mol m h (± 0.0003 mol m h) under continuous illumination. Glycerol consumption as well as hydrogen yield also decreased under diurnal light cycles. Nonetheless, hydrogen production in a thermosiphon photobioreactor under outdoor conditions was demonstrated as possible avenue for further investigation.
通过微生物光发酵产氢作为一种可持续的制氢方法具有很大的前景；然而，与光发酵产氢相关的运营成本需要降低。可以使用诸如热虹吸光生物反应器之类的被动循环系统，并在自然阳光下运行来降低成本。在本研究中，实施了一个自动化系统，以在受控条件下研究昼夜光照周期对沼泽红假单胞菌的产氢率和生长以及热虹吸光生物反应器运行的影响。发现模拟白天时间的昼夜光照周期会降低热虹吸光生物反应器中的产氢量，其最大产率较低，为0.015 mol m h（±0.002 mol m h），而在连续光照下为0.180 mol m h（±0.0003 mol m h）。在昼夜光照周期下，甘油消耗量和氢气产率也会降低。尽管如此，热虹吸光生物反应器在户外条件下产氢被证明是一个值得进一步研究的途径。
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