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《工程(英文)》 >> 2023年 第24卷 第5期 doi: 10.1016/j.eng.2021.08.027

长期培养和宏组学分析揭示了烃污染环境中的甲基营养型产甲烷途径

a State Key Laboratory of Bioreactor Engineering and School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
b Exploration and Development Research Institute of Daqing Oilfield Company Limited, PetroChina, Daqing 163712, China
c Environmental Engineering and Engineering Group, Guangdong Technion Israel Institute of Technology, Shantou 515063, China
d Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
e Engineering Research Center of Microbial Enhanced Oil Recovery (MEOR), East China University of Science and Technology, Shanghai 200237, China

收稿日期: 2021-04-01 修回日期: 2021-07-14 录用日期: 2021-08-04 发布日期: 2022-01-10

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摘要

针对石油烃污染的厌氧环境,利用微生物的代谢作用将石油烃转化为甲烷是一种潜在的生物修复策略。然而,目前对于微生物厌氧烃降解产甲烷的机制尚不清楚。经过10 年的持续富集和转接培养,获得了一种能够降解正构烷烃(C15~C20)并且产甲烷富集培养体系。经过转接培养后,该培养物甲烷生产的动力学特性得到了持续的提高。综合宏基因组和宏转录组的分析结果,发现正构烷烃主要通过Desulfosarcinaceae、Firmicutes 和Synergistetes 菌,利用富马酸加成的方式进行起始活化,然后在Tepidiphilus 菌的协同作用下进一步降解。同时,体系中含量较多的Anaerolineaceae 菌主要负责死细胞生物质的回收。根据宏转录组学分析结果,甲烷主要通过H2依赖的甲基营养型产甲烷途径产生,主要由候选门Verstraetearchaeta 内的Methanomethyliaceae 利用死细胞生物质回收代谢过程中产生的三甲胺来产生甲烷。这些发现表明,依赖H2的甲基营养产甲烷菌以及甲基营养产甲烷菌可能在含石油烃的地下生态系统的碳循环过程中发挥着重要的作用。

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