Effect of volatile fatty acids mixtures on the simultaneous photofermentative production of hydrogen and polyhydroxybutyrate
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- 作者：René Cardeña ; Idania Valdez-Vazquez…
- 关键词：Hydrogen ; Photofermentation ; Polyhydroxybutyrate ; Purple non ; sulfur bacteria
- 刊名：Bioprocess and Biosystems Engineering
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：40
- 期：2
- 页码：231-239
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Biotechnology; Industrial and Production Engineering; Environmental Engineering/Biotechnology; Industrial Chemistry/Chemical Engineering; Food Science;
- 出版者：Springer Berlin Heidelberg
- ISSN：1615-7605
- 卷排序：40
文摘
Purple non-sulfur bacteria generate hydrogen and polyhydroxybutyrate (PHB) as a mechanism for disposing of reducing equivalents generated during substrate consumption. However, both pathways compete for the reducing equivalents released from bacteria growing under certain substrates, thus the formation of hydrogen or PHB is detrimental to the formation of each other. The effect of mixtures of acetic, propionic and butyric acids on the formation of H2 and PHB was evaluated using Box–Behnken design. A bacterial community mainly constituted by Rhodopseudomonas palustris was used as inoculum. It was observed that the three volatile fatty acids had a significant effect on the specific PHB production. However, only the propionic acid had a significant effect on the specific H2 production activity and the highest value was observed when acetate was the main component in the mixture. The maximum values for the specific PHB and hydrogen production rates were 16.4 mg-PHB/g-TSS/day and 391 mL-H2/g-TSS/day, respectively.