School of Environmental Science and Engineering, Gwangju Institute of Science and Technology , Gwangju 500-712, Republic of Korea.
Environ Sci Technol. 2013 Sep 3;47(17):10078-84. doi: 10.1021/es402412c. Epub 2013 Aug 21.
Production and emission of methane have been increasing concerns due to its significant effect on global climate change and the carbon cycle. Here we report facilitated methane production from acetate by a novel community of methanogens and acetate oxidizing bacteria in the presence of poorly crystalline akaganeite slurry. Comparative analyses showed that methanogenesis was significantly enhanced by added akaganeite and acetate was mostly stoichiometrically converted to methane. Electrons produced from anaerobic acetate oxidation are transferred to akaganeite nanorods that likely prompt the transformation into goethite nanofibers through a series of biogeochemical processes of soluble Fe(II) readsorption and Fe(III) reprecipitation. The methanogenic archaea likely harness the biotransformation of akaganeite to goethite by the Fe(III)-Fe(II) cycle to facilitate production of methane. These results provide new insights into biogeochemistry of iron minerals and methanogenesis in the environment, as well as the development of sustainable methods for microbial methane production.
由于甲烷对全球气候变化和碳循环的重大影响，其产生和排放引起了越来越多的关注。在这里，我们报告了在贫晶纤铁矿浆料存在的情况下，一种新型产甲烷菌和乙酸氧化菌群落促进了乙酸产生甲烷。比较分析表明，添加纤铁矿显著促进了甲烷生成，并且乙酸大部分化学计量转化为甲烷。从厌氧乙酸氧化产生的电子被转移到纤铁矿纳米棒上，这可能通过一系列生物地球化学过程，包括可溶性 Fe(II)再吸附和 Fe(III)再沉淀，促使纤铁矿转化为针铁矿纳米纤维。产甲烷古菌可能利用 Fe(III)-Fe(II)循环将纤铁矿生物转化为针铁矿，从而促进甲烷的产生。这些结果为环境中铁矿物的生物地球化学和甲烷生成提供了新的见解，以及为微生物甲烷生产的可持续方法的发展提供了新的见解。
