Stimulation of Smithella-dominating propionate oxidation in a sediment enrichment by magnetite and carbon nanotubes

Environmental Microbiology Reports
Xingxuan XiaYahai Lu

Abstract

Recent studies have shown that application of conductive materials including magnetite and carbon nanotubes (CNTs) can promote the methanogenic decomposition of short-chain fatty acids and even more complex organic matter in anaerobic digesters and natural habitats. The linkage to microbial identity and the mechanisms, however, remain poorly understood. Here, we evaluate the effects of nanoscale magnetite (nanoFe3 O4 ) and multiwalled CNTs on the syntrophic oxidation of propionate in an enrichment obtained from lake sediment. The microbial populations were composed mainly of Smithella, Syntrophomonas, Methanosaeta, Methanosarcina and Methanoregula. In addition to acetate, butyrate was transiently accumulated indicating that propionate was oxidized by Smithella via the dismutation pathway and part of the leaked butyrate was oxidized by Syntrophomonas. Propionate oxidation and CH4 production were significantly accelerated in the presence of nanoFe3 O4 and CNTs. While propionate oxidation was suppressed upon H2 application and suspended completely upon formate application in the control, this suppressive effect was substantially compromised in the presence of nanoFe3 O4 and CNTs. The tests on hydrogenotrophic methanogenesis of a p...Continue Reading

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Citations

May 12, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Bing GuoYang Liu
Mar 21, 2021·Bioresource Technology·Wei Wang, Duu-Jong Lee
Apr 9, 2021·Frontiers in Microbiology·Kailin Gao, Yahai Lu
Jun 6, 2021·Environmental Microbiology Reports·Yidan JinYahai Lu
Jun 15, 2021·Frontiers in Microbiology·Fan JiangWei Fan
Jan 20, 2020·The Science of the Total Environment·Wende MaYuanpeng Wang

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