Cr(VI) reduction coupled with anaerobic oxidation of methane in a laboratory reactor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Raymond J. Zeng

Detail(s)

Original languageEnglish
Pages (from-to)445-452
Journal / PublicationWater Research
Volume102
Early online date1 Jul 2016
Publication statusPublished - 1 Oct 2016

Abstract

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 13CH4 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.

Research Area(s)

  • Anaerobic oxidation of methane, Chromium reduction, ANME-2d archaea, Coupling process, Microbial analysis, Biogeochemical cycles, MEMBRANE BIOFILM REACTOR, PSEUDOMONAS-AERUGINOSA, MICROBIAL COMMUNITY, BACILLUS-SUBTILIS, CARBON SOURCE, WASTE-WATER, CHROMIUM, DENITRIFICATION, BACTERIA, REMOVAL

Citation Format(s)

Cr(VI) reduction coupled with anaerobic oxidation of methane in a laboratory reactor. / Lu, Yong-Ze; Fu, Liang; Ding, Jing; Ding, Zhao-Wei; Li, Na; Zeng, Raymond J.

In: Water Research, Vol. 102, 01.10.2016, p. 445-452.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review