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Published on: October 24, 2016
Effects of impurities on the syngas fermentation: Mechanism and future perspectives
Jun Ni1, Hengfeng Miao2, Wanqing Zhang1
1School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China.
Abstract:
In the process of syngas bioconversion into high value-added chemicals, the presence and impact of impurities must be acknowledged. The present review aims to summarize the progress regarding the effects of various impurities on the syngas fermentation, with the focus on impurity formation in gasification, its inhibition on syngas conversion and influential mechanism. The production of impurities is influenced by various parameters in the gasification process, but substance characteristics is the most relevant factor on impurities composition and concentration. The inhibitory threshold of H2S, NH3 and CN- on syngas bioconversion was 108 ppm, 1520 ppm and 0.025 mM, respectively. In the response to impurities, functional microorganisms related to syngas bioconversion were normally inhibited. Furthermore, the inhibitory mechanisms in aspect of electron transfer and energy synthesis were revealed via the analysis of syngas and impurities metabolic pathway. To alleviate the impurity inhibition, the potential solutions are proposed.
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