Bacteria and archaea involved in anaerobic mercury methylation and methane oxidation in anaerobic sulfateerich reactors

文献类型： 外文期刊

第一作者： Du, Hongxia

作者： Du, Hongxia;Liu, Yang;Xie, Haiying;Igarashi, Yasuo;Imanaka, Tadayuki;Luo, Feng;Ma, Ming;Ma, Ming;Sun, Tao;An, Siwei;Wang, Dingyong

作者机构：

关键词： Bacteria; Archaea; Mercury methylation; Methane oxidation; Methylmercury demethylation; Sulfate reduction

期刊名称：CHEMOSPHERE （ 影响因子：8.1； 五年影响因子：7.7 ）

ISSN： 0045-6535

年卷期： 2021 年 274 卷

页码：

收录情况： SCI

摘要： The identification of dominant microbes in anaerobic mercury (Hg) methylation, methylmercury (MeHg) demethylation, and methane oxidation as sulfate-reducing bacteria, methanogens or, probably, anaerobic methanotrophic archaea (ANMEs) is of great interest. To date, however, the interrelationship of bacteria and archaea involved in these processes remains unclear. Here, we demonstrated the dynamics of microorganisms participating in these processes. Anaerobic fixed-bed reactors were operated with swine manure and sludge to produce methane stably, and then, sulfate (reactor C), sulfate and Hg(II) (reactor H), and sulfate and MeHg (reactor M) were added, and the reactors were operated for 120 d, divided equally into four periods, P1-P4. The bacterial compositions changed nonsignificantly, whereas Meth-anosaeta in reactors H and M decreased significantly, revealing that it was irrelevant for Hg transformation. The abundances of Syntrophomonadaceae, Methanoculleus, Candidatus Methanogranum and Candidatus Methanoplasma increased continuously with time; these species probably functioned in these processes, but further evidence is needed. Desulfocella and Desulfobacterium dominated first but eventually almost vanished, while the dominant archaeal genera Methanogenium, Methanoculleus and Methanocorpusculum were closely related to ANME-1 and ANME-2. PLS-DA results indicated that both bacteria and archaea in different periods in the three reactors were clustered separately, implying that the microbial compositions in the same periods were similar and changed markedly with time. (C) 2021 Elsevier Ltd. All rights reserved.

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