结晶氧化铁在甲烷厌氧氧化中减缓甲烷的作用,ACS ES&T Water

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结晶氧化铁在甲烷厌氧氧化中减缓甲烷的作用
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-03-23 , DOI: 10.1021/acsestwater.0c00199
Weiwei Li _{1,

2,

3} , Chen Cai ₁ , Yarong Song ₁ , Gaofeng Ni ₁ , Xueqin Zhang ₁ , Peili Lu _{2,

3}

Affiliation

预计生物（Fe）依赖于甲烷的Fe（III）厌氧氧化（AOM）是自然和人为环境中的关键甲烷汇。在这些环境中，包括含水层，河口，海洋沉积物和土壤中，结晶的Fe（III）是一种重要的与环境有关的Fe（III）形式。然而，其在减缓甲烷中的作用仍然未知。这项研究调查了结晶的Fe（III）作为AOM的电子受体的可行性。一种以厌氧甲烷营养古细菌（Candidatus）为主导的文化用磁铁矿和针铁矿对“ Methanoperedens ferrireducens”进行了修改。长期性能数据表明，磁铁矿和针铁矿都可以用作AOM的电子受体。AOM速率与喂入无定形亚铁水合物的对照生物反应器相当。微生物分析表明，钙。“ M. 还原铁和/或产甲烷菌进行了Fe（III）依赖的AOM。生物铁还原导致菱铁矿的形成和溶解的Fe（II）的积累。溶解的Fe（II）可能对Ca有毒。“ M. ”，同时刺激了一种潜在的Fe（II）氧化剂的生长，该氧化剂属于Chlorobium属。Ca共存。“ M. 还原铁” /甲烷菌和绿球藻细菌显示甲烷驱动的铁循环。这些发现表明，在富含甲烷和氧化铁的环境中，依赖于Fe（III）的结晶性AOM可能在调节甲烷通量和铁循环中起重要作用。

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The Role of Crystalline Iron Oxides in Methane Mitigation through Anaerobic Oxidation of Methane

Biological Fe(III)-dependent anaerobic oxidation of methane (AOM) is predicted to be a key methane sink in natural and anthropogenic environments. Crystalline Fe(III) is an important environmentally relevant form of Fe(III) in those environments, including aquifers, estuaries, marine sediments, and soils. However, its role in methane mitigation remains unknown. This study investigated the feasibility of crystalline Fe(III) as an electron acceptor for AOM. A culture dominated by an anaerobic methanotrophic (ANME) archaeon, Candidatus “Methanoperedens ferrireducens”, was amended with magnetite and goethite. Long-term performance data indicated that both magnetite and goethite can be used as electron acceptors for AOM. The AOM rate was comparable to a control bioreactor fed with amorphous ferrihydrite. Microbial analyses suggested that Ca. “M. ferrireducens” and/or methanogens undertook Fe(III)-dependent AOM. Biotic iron reduction resulted in the formation of siderite and accumulation of dissolved Fe(II). Dissolved Fe(II) was likely toxic to Ca. “M. ferrireducens”, while stimulated the growth of a potential Fe(II) oxidizer belonging to genus Chlorobium. Coexistence of Ca. “M. ferrireducens”/methanogens and Chlorobium bacteria revealed a methane-driven iron cycle. These findings suggest that crystalline Fe(III)-dependent AOM may play an important role in regulating methane flux and iron cycle in environments rich in methane and iron oxides.

更新日期：2021-05-14

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