Chromium isotope fractionation during Cr(VI) reduction in a methane-based hollow-fiber membrane biofilm reactor

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

12 Scopus Citations
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Author(s)

  • Yong-Ze Lu
  • Guo-Jun Chen
  • Liang Fu
  • Li-Ping Qin
  • Raymond Jianxiong Zeng

Detail(s)

Original languageEnglish
Pages (from-to)263-270
Journal / PublicationWater Research
Volume130
Early online date7 Dec 2017
Publication statusPublished - 1 Mar 2018

Abstract

Chromium (Cr) isotope fractionation analysis is a promising tool for monitoring Cr(VI) reduction in natural aqueous systems. In addition, large amounts of CH4 in natural aqueous sediments are oxidized to CO2 through methanotrophs, thereby mitigating emissions to the atmosphere. However, the investigations on the Cr(VI) reduction process with methanotrophs, and the associated Cr isotope fractionation patterns are scarce. In this study, we have shown that Cr(VI) reduction can occur in the presence of CH4 as the sole electron donor in a hollow-fiber membrane reactor (HfMBR) after direct bacteria enrichment from sediment samples. Products of the methane oxidation by the methanotrophs are used by microbes to reduce Cr(VI) as shown by the progressive increase in δ53Cr with time in the CH4 feed reactor. The isotope fractionation factor (ε) of -2.62 ± 0.20‰ was obtained from the application of the Rayleigh distillation model. The results of Cr isotope fractionation analysis also explained the decrease of Cr(VI) concentration in the N2 feed reactor, where the δ 53Cr values remained steady in the first two weeks but significantly increased in the last two weeks, indicating that physical adsorption and subsequent Cr(VI) reduction occurred. This study extended the application of Cr isotope fractionation, showing the suitability of this method for clarifying different Cr(VI) removal processes.

Research Area(s)

  • Cr(VI) reduction, Chromium isotope fractionation, Methane oxidation, Hollow-fiber membrane reactor (HfMBR), Process analysis, ANAEROBIC OXIDATION, IN-SITU, CONTAMINATED GROUNDWATER, DENITRIFYING CONDITIONS, HEXAVALENT CHROMIUM, ANAMMOX BACTERIA, WASTE-WATER, CR, MICROORGANISMS, CONVERSION

Citation Format(s)

Chromium isotope fractionation during Cr(VI) reduction in a methane-based hollow-fiber membrane biofilm reactor. / Lu, Yong-Ze; Chen, Guo-Jun; Bai, Ya-Nan; Fu, Liang; Qin, Li-Ping; Zeng, Raymond Jianxiong.

In: Water Research, Vol. 130, 01.03.2018, p. 263-270.

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