DOI: 10.1016/j.watres.2017.11.045
Scopus记录号: 2-s2.0-85037667597
论文题名: Chromium isotope fractionation during Cr(VI) reduction in a methane-based hollow-fiber membrane biofilm reactor
作者: Lu Y.-Z. ; Chen G.-J. ; Bai Y.-N. ; Fu L. ; Qin L.-P. ; Zeng R.J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 130 起始页码: 263
结束页码: 270
语种: 英语
英文关键词: Chromium isotope fractionation
; Cr(VI) reduction
; Hollow-fiber membrane reactor (HfMBR)
; Methane oxidation
; Process analysis
Scopus关键词: Bacteria
; Bioreactors
; Distillation
; Isotopes
; Membranes
; Methane
; Oxidation
; Radioactive tracers
; Cr reductions
; Hollow fiber membranes
; Isotope fractionation
; Methane oxidation
; Process analysis
; Chromium compounds
; chromium
; isotope
; methane
; nitrogen
; chromium
; chromium hexavalent ion
; adsorption
; aqueous solution
; biofilm
; bioreactor
; chromium
; concentration (composition)
; distillation
; electron
; isotopic analysis
; isotopic fractionation
; methane
; oxidation
; pollutant removal
; reduction
; sediment chemistry
; adsorption
; Article
; atmosphere
; bacterium
; distillation
; electron transport
; fractionation
; isotope analysis
; methanotroph
; model
; nonhuman
; oxidation
; priority journal
; reduction (chemistry)
; sediment
; biofilm
; bioreactor
; chemistry
; fractionation
; metabolism
; microbiology
; oxidation reduction reaction
; water pollutant
; Bacteria
; Biofilms
; Bioreactors
; Chemical Fractionation
; Chromium
; Chromium Isotopes
; Geologic Sediments
; Methane
; Oxidation-Reduction
; Water Pollutants, Chemical
英文摘要: 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 δ53Cr 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. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113038
Appears in Collections: 气候减缓与适应
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作者单位: CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China; CAS Key Laboratory of Crust—Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, 215123, China
Recommended Citation:
Lu Y.-Z.,Chen G.-J.,Bai Y.-N.,et al. Chromium isotope fractionation during Cr(VI) reduction in a methane-based hollow-fiber membrane biofilm reactor[J]. Water Research,2018-01-01,130