Iron reduction in the DAMO/Shewanella oneidensis MR-1 coculture system and the fate of Fe(II)

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

28 Scopus Citations
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Author(s)

  • Liang Fu
  • Zhao-Wei Ding
  • Jing Ding
  • Yong-Ze Lu
  • Raymond J. Zeng

Detail(s)

Original languageEnglish
Pages (from-to)808-815
Journal / PublicationWater Research
Volume88
Early online date10 Nov 2015
Publication statusPublished - 1 Jan 2016

Abstract

Dissimilatory iron reduction and anaerobic methane oxidation processes play important roles in the global iron and carbon cycle, respectively. This study explored the ferrihydrite reduction process with methane as a carbon source in a coculture system of denitrifying anaerobic methane oxidation (DAMO) microbes enriched in laboratory and Shewanella oneidensis MR-1, and then characterized the reduced products. Ferrihydrite reduction was also studied in the DAMO and Shewanella systems alone. The ferrihydrite was reduced slightly (<13.3%) in the separate systems, but greatly (42.0–88.3%) in the coculture system. Isotope experiment of 13CH4 addition revealed that DAMO microbes coupled to S. oneidensis MR-1 in a ferric iron reduction process with 13CH4 consumption and 13CO2 production. Compared with ferrihydrite, the reduced products showed increased crystallinity (from amorphous state to crystallinity 77.1%) and magnetism (from paramagnetic to ferromagnetic). The produced ferrous iron was formed into minerals primarily composed of siderite with a small amount vivianite and magnetite. A portion of products covered the cell surface and hindered further reactions. The results presented herein widen the current understanding of iron metabolism and mineralization in the ocean, and show that the coculture systems of DAMO microbes and Shewanella have the potential to be globally important to iron reduction and methane oxidation.

Research Area(s)

  • Denitrifying anaerobic methane oxidation, Ferrihydrite bioreduction, Shewanella oneidensis MR-1, Coculture, Secondary minerals, ANAEROBIC METHANE OXIDATION, MINERALIZATION PATHWAYS, FERROUS IRON, BACTERIA, MICROORGANISMS, FERRIHYDRITE, SEDIMENTS, DRIVEN, ENRICHMENT, SULFUR

Citation Format(s)

Iron reduction in the DAMO/Shewanella oneidensis MR-1 coculture system and the fate of Fe(II). / Fu, Liang; Li, Shan-Wei; Ding, Zhao-Wei; Ding, Jing; Lu, Yong-Ze; Zeng, Raymond J.

In: Water Research, Vol. 88, 01.01.2016, p. 808-815.

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