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Indexed by:期刊论文

Date of Publication:2016-08-17

Journal:INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

Included Journals:SCIE、EI、Scopus

Volume:41

Issue:31

Page Number:13368-13379

ISSN No.:0360-3199

Key Words:Biocathode; Microbial electrolysis cell; Carbon source; Bacterial acclimation; Cd(II) removal; Hydrogen production

Abstract:Enhanced Cd(II) removal with simultaneous hydrogen production was achieved in biocathode microbial electrolysis cells (MECs) using carbon source of acetate or NaHCO3 at long-term bacterial community acclimation and elevated Cd(II) concentrations. Removal of Cd(II) reached 7.33 +/- 0.37 mg/L/h (acetate) and 6.56 +/- 0.38 mg/L/h (NaHCO3) whereas hydrogen production was 0.301 +/- 0.005 m(3)/m(3)/d (acetate) and 0.127 +/- 0.024 m3/m3/ d (NaHCO3) at an initial Cd(II) of 50 mg/L. Similar Cd(II) and metallic Cd were present in the precipitates of either acetate or NaHCO3 biocathodes whereas same predominant species but in different proportions were found in the acetate or, NaHCO3 biofilms. These findings demonstrate the importance of both long-term bacterial community acclimation at elevated Cd(II) concentrations and carbon source for enhanced Cd(II) removal with simultaneous hydrogen production in the biocathode MECs. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.