Effect of external resistance on bacterial diversity and metabolism in cellulose-fed microbial fuel cells

Bioresource Technology
Hamid Rismani-YazdiOlli H Tuovinen

Abstract

External resistance affects the performance of microbial fuel cells (MFCs) by controlling the flow of electrons from the anode to the cathode. The purpose of this study was to determine the effect of external resistance on bacterial diversity and metabolism in MFCs. Four external resistances (20, 249, 480, and 1000 Ω) were tested by operating parallel MFCs independently at constant circuit loads for 10 weeks. A maximum power density of 66 mW m(-2) was achieved by the 20 Ω MFCs, while the MFCs with 249, 480, and 1000 Ω external resistances produced 57.5, 27, and 47 mW m(-2), respectively. Denaturing gradient gel electrophoresis analysis of partial 16S rRNA genes showed clear differences between the planktonic and anode-attached populations at various external resistances. Concentrations of short chain fatty acids were higher in MFCs with larger circuit loads, suggesting that fermentative metabolism dominated over anaerobic respiration using the anode as the final electron acceptor.

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Citations

May 11, 2012·The ISME Journal·Matthew D YatesBruce E Logan
Jun 25, 2014·Journal of Bioscience and Bioengineering·Emre Oğuz KöroğluMehmet Çakmakci
Aug 17, 2010·Bioresource Technology·Hsiang-Yu WangJo-Shu Chang
Apr 8, 2016·Environmental Science & Technology·Xiangdan JinYifeng Zhang
Aug 9, 2015·Bioelectrochemistry·Masih Karimi AlavijehMohammad Mahdi Mardanpour
Jul 21, 2015·Bioresource Technology·Lucinda Elizabeth Doyle, Enrico Marsili
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Apr 28, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Andreas VoglMarc Wichern
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Mar 5, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Laura RagoAlbert Guisasola
Dec 26, 2016·Environmental Science and Pollution Research International·Renbing BaoLiuxiang Zhong
Dec 9, 2020·Microorganisms·Maria Jose Salar-GarciaIoannis A Ieropoulos
Jan 27, 2018·Journal of Bioscience and Bioengineering·Kei SuzukiHiroyuki Futamata
Aug 11, 2020·Bioresource Technology·Kathryn LawsonBruce E Logan
May 26, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Sadik RahmanMahad Said Baawain
Feb 19, 2011·Environmental Science & Technology·Zhiyong RenJohn M Regan

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