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功能性微生物的相互作用及其对甲烷生物转化为短链脂肪酸的贡献。

Interactions of functional microorganisms and their contributions to methane bioconversion to short-chain fatty acids.

作者信息

Zhao Lei, Chen Hui, Yuan Zhiguo, Guo Jianhua

机构信息

Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia; School of Environment, State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin, 150090, China.

Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia; Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China.

出版信息

Water Res. 2021 Jul 1;199:117184. doi: 10.1016/j.watres.2021.117184. Epub 2021 Apr 26.

Abstract

Methane bioconversion to value-added liquid chemicals has been proposed as a promising solution to augment the petroleum-dominated chemical market. Recent investigations have reported that various electron acceptors (e.g., nitrite and nitrate) are available to drive methane bioconversion to short-chain fatty acids (SCFAs). However, little is known about effects of the rate electron acceptor supplied on liquid chemical production from methane. Herein, three independent membrane biofilm reactors (MBfRs) feeding with respective nitrate, nitrite, combined nitrate and nitrite were operated under high and low rate condition in succession, to study whether feeding rate of electron acceptors could impact the methane bioconversion to SCFAs and the associated microbiological features. Long-term operation showed that all tested electron acceptors with a high supply rate were favorable for methane bioconversion to SCFAs (990.9 mg Ld, 1695.7 mg Ld, and 2425.7 mg Ld), while under a low electron acceptor feeding rate, the SCFA production rate decreased to 8.9 mg Ld, 16.8 mg Ld, and 260.1 mg Ld, respectively. Microbial community characterization showed that the biofilm was predominated by Methanosarcina, Methanobacterium, Propionispora and Clostridium. On the basis of the known metabolism characteristics of these microorganisms, it was assumed that these methanogens and fermenters contributed jointly to methane bioconversion to SCFAs. The findings could be helpful to understand the role of electron acceptor rate in methane bioconversion to liquid chemicals.

摘要

甲烷生物转化为高附加值液体化学品已被视为增强以石油为主导的化学市场的一种有前景的解决方案。最近的研究报告称,各种电子受体(如亚硝酸盐和硝酸盐)可用于驱动甲烷生物转化为短链脂肪酸(SCFAs)。然而,关于电子受体供应速率对甲烷液体化学品生产的影响知之甚少。在此,三个独立的膜生物膜反应器(MBfRs)分别供应硝酸盐、亚硝酸盐、硝酸盐和亚硝酸盐的混合物,先后在高负荷和低负荷条件下运行,以研究电子受体的进料速率是否会影响甲烷生物转化为SCFAs以及相关的微生物特征。长期运行表明,所有测试的高供应速率电子受体都有利于甲烷生物转化为SCFAs(分别为990.9mg/L·d、1695.7mg/L·d和2425.7mg/L·d),而在低电子受体进料速率下,SCFA的生产率分别降至8.9mg/L·d、16.8mg/L·d和260.1mg/L·d。微生物群落特征表明,生物膜以甲烷八叠球菌、甲烷杆菌、丙酸芽孢杆菌和梭菌为主。根据这些微生物已知的代谢特征,推测这些产甲烷菌和发酵菌共同促进了甲烷生物转化为SCFAs。这些发现有助于理解电子受体速率在甲烷生物转化为液体化学品中的作用。

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