Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells

Bioresource Technology, Volume 169, 2014, Pages 265-270.

Xiangtong Zhou1, Youpeng Qu1,4, Byung Hong Kim1,2,3, Pamela Yengfung Choo2, Jia Liu1, Yue Du1, Weihua He1, In Seop Chang5, Nanqi Ren1, Yujie Feng1, .

 

  1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China and
  2. Bioelectrochemistry Laboratory, Water Environment and Remediation Research Centre, Korea Institute of Science and Technology, Republic of Korea and
  3. Fuel Cell Institute, National University of Malaysia, 43600 UKM, Bangi, Malaysia and
  4. School of Life Science and Biotechnology, Harbin Institute of Technology, Nangang District, Harbin, China and
  5. Energy and Biotechnology Laboratory, School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Republic of Korea

 

Abstract

The effects of azide on electron transport of exoelectrogens were investigated using air-cathode MFCs. These MFCs enriched with azide at the concentration higher than 0.5 mM generated lower current and coulomb efficiency (CE) than the control reactors, but at the concentration lower than 0.2 mM MFCs generated higher current and CE. Power density curves showed overshoot at higher azide concentrations, with power and current density decreasing simultaneously. Electrochemical impedance spectroscopy (EIS) showed that azide at high concentration increased the charge transfer resistance. These analyses might reflect that a part of electrons were consumed by the anode microbial population rather than transferred to the anode. Bacterial population analyses showed azide-enriched anodes were dominated by Deltaproteo bacteria compared with the controls. Based on these results it is hypothesized that azide can eliminate the growth of aerobic respiratory bacteria, and at the same time is used as an electron acceptor/sink.

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