Novel insights into the anaerobic digestion of propionate via Syntrophobacter fumaroxidans and Geobacter sulfurreducens: Process and mechanism

WATER RESEARCH

卷:200

Article

Wang, Tao¹  Zhu, Gefu²  Kuang, Bin³  Jia, Jianbo¹  Liu, Changyu¹  Cai, Guanjing⁴  Li, Chunxing⁵ 

[1] Wuyi Univ, Sch Biotechnol & Hlth Sci, Jiangmen 529020, Peoples R China

[2] Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China

[3] Jiangmen Polytech, Sch Econ & Management, Jiangmen 529020, Peoples R China

[4] Chinese Acad Sci, Key Lab Urban Pollutant Convers, Inst Urban Environm, Xiamen 361021, Peoples R China

[5] Tech Univ Denmark, Dept Chem & Biochem Engn, DK-2800 Lyngby, Denmark

关键词: Anaerobic digestion;    Propionate;    Syntrophism;    Syntrophobacter fumaroxidans;    Geobacter sulfurreducens;    Mechanism;   

DOI  :  10.1016/j.watres.2021.117270

来源: Elsevier

【 摘 要 】

The accumulation of volatile fatty acids, particularly propionic acid, significantly inhibits the efficiency of the anaerobic digestion system. In propionate degradation metabolism, the unfavorable thermodynamics of syntrophic reactions, strict ecological niche of syntrophic priopionate oxidizing bacteria, and slow metabolic rate of methanogens are regarded as major limitations. In this study, Geobacter sulfurreducens was co-cultured with Syntrophobacter fumaroxidans in bioelelectrochemical cells to analyze the propionate degradation process, impact factor, mechanism metabolic pathways, and electron transfer comprehensively. The results revealed that the syntroph S. fumaroxidans and syntrophic partner G. sulfurreducens achieved more efficient propionate degradation than the control group, comprising S. fumaroxidans and methanogens. Moreover, the carbon resource concentration and pH were both significantly correlated with propionate degradation (P < 0.01). The results further confirmed that G. sulfurreducen strengthened the consumption of H-2 and acetate via direct interspecific electron transfer in propionate degradation. These findings indicate that G. sulfurreducens plays an unidentified functional role in propionate degradation. (C) 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

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