期刊
BIORESOURCE TECHNOLOGY
卷 369, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.128436
关键词
Chain elongation; Bioaugmentation; Clostridium kluyveri; Electro-fermentation; Co-culture
This study compared the performances of Clostridium kluyveri, a chain elongation (CE) model strain, with or without bioaugmentation and in conventional or electro-fermentation systems. The results showed that bioaugmentation treatments, especially in electro-fermentation system, had better CE performance, with a highest caproate concentration of 4.68 g.L-1. Mechanism analysis revealed that C. kluyveri responded to the electric field and emerged synergy with the acetogens, which was supported by the increases of C. kluyveri colonization and the acetogens abundance in biofilm.
As a chain elongation (CE) model strain, Clostridium kluyveri has been used in the studies of bioaugmentation of caproate production. However, its application in the novel electro-fermentation CE system for bioaugmentation is still unclear. In this study, the CE performances, with or without bioaugmentation and in conventional or electro-fermentation systems were compared. And the mechanism of electrochemical-bioaugmentation by constructing a co-culture of Acetobacterium woodii and Clostridium kluyveri were further verified. Results demonstrated that the bioaugmentation treatments have better CE performance, especially in electro-fermentation system, with a highest caproate concentration of 4.68 g.L-1. Mechanism analysis revealed that C. kluyveri responded to the electric field and emerged synergy with the acetogens, which was proved by the increases of C. kluyveri colonization and the acetogens abundance in biofilm and supported by the co-culture experiment. This study provides a novel insight of microbial synergy mechanism of C. kluyveri during CE bioaugmentation in electro-fermentation system.
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