Journal
WATER RESEARCH
Volume 102, Issue -, Pages 445-452Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.06.065
Keywords
Anaerobic oxidation of methane; Chromium reduction; ANME-2d archaea; Coupling process; Microbial analysis; Biogeochemical cycles
Funding
- National Natural Science Foundation of China [51178444]
- National Hi-Technology Development 863 Program of China [2011AA060901]
- Hundred-Talent Program of Chinese Academy of Science
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Program for Changjiang Scholars and Innovative Research Team in University
- Fundamental Research Funds for the Central Universities
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The process of anaerobic oxidation of methane (AOM) is globally important because of its contribution to the carbon cycle in the environment. Besides, microorganisms play important roles in the environmental fate of chromium. However, there have been no studies to date on the interaction between methane and chromium in batch reactor systems. In this study, biological Cr(VI) reduction was investigated using methane as the sole electron donor. Isotopic (CH4)-C-13 in the batch experiments and long-term performance in the reactor demonstrated that Cr(VI) reduction is coupled with methane oxidation. High-throughput sequencing of the 16S rRNA genes demonstrated that the microbial community had changed substantially after Cr(VI) reduction. The populations of ANME-2d archaea were enhanced, and they became the only predominant AOM-related microbe. Interestingly, other bacteria with significant increases in abundance were not reported as having the ability to reduce Cr(VI). According to these results, two mechanisms were proposed: 1) Cr(VI) is reduced by ANME-2d alone; 2) Cr(VI) is reduced by unknown Cr(VI)-reducing microbes coupled with ANME-2d. This study revealed the potential relationship between Cr(VI) reduction and CH4 oxidation, and extended our knowledge of the relationship between the AOM process and biogeochemical cycles. (C) 2016 Elsevier Ltd. All rights reserved.
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