Performance of mixed-species biocathode microbial fuel cells using saline mustard tuber wastewater as self-buffered catholyte

•Mustard tuber wastewater could be used as self-buffered catholyte.•Simultaneous COD and nitrogen removal were obtained at the cathode.•COD along with ammonium present in catholyte declined voltage output.•Overpotential for oxygen reduction significantly lowered energy recovery. Mixed-species biocat...

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Published in:Bioresource technology 2015-03, Vol.180, p.137-143
Main Authors: Guo, Fei, Fu, Guokai, Zhang, Zhi
Format: Article
Language:English
Subjects:
Ammonia - metabolism
Bioelectric Energy Sources - microbiology
Biological Oxygen Demand Analysis
Buffers
COD and nitrogen removal
Denitrification
Electrodes
Heterotrophic Processes
Microbial fuel cell
Mustard Plant
Nitrogen - isolation & purification
Oxygen - metabolism
Saline mustard tuber wastewater
Self-buffered catholyte
Waste Water
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cited_by cdi_FETCH-LOGICAL-c368t-2b5ed33f18d4d943531eadda13797069d9a6ec58c06c884fcc18d99e34aa3ce93
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container_title Bioresource technology
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creator Guo, Fei
Fu, Guokai
Zhang, Zhi
description •Mustard tuber wastewater could be used as self-buffered catholyte.•Simultaneous COD and nitrogen removal were obtained at the cathode.•COD along with ammonium present in catholyte declined voltage output.•Overpotential for oxygen reduction significantly lowered energy recovery. Mixed-species biocathode microbial fuel cells (MFCs) were constructed. Mustard tuber wastewater (MTWW) was used as catholyte. Simultaneous organic matters and nitrogen removal at the cathode was observed, and majority of contaminants reduced were accomplished within acclimating period (AP). Concerning nitrogen removal, aerobic and anaerobic microenvironment could be formed within the cathodic biofilms, and both heterotrophic denitrification and bioelectrochemical denitrification were involved. Also, it was demonstrated that organic matters and ammonium could have detrimental effects on voltage output, but it could retrieve finally. Similar maximum power densities were obtained during stage1 (1.20Wm−3), stage2 (1.24Wm−3) and stage3 (1.32Wm−3). However, overpotential for oxygen reduction was investigated due to lower bacteria activity at cathode, which could major limitation for energy recovery. Considering similar performance of MFCs during different stages, it could be concluded that MTWW was adequately self-buffered when used as catholyte at mixed-species biocathodes.
doi_str_mv 10.1016/j.biortech.2014.11.113
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Mixed-species biocathode microbial fuel cells (MFCs) were constructed. Mustard tuber wastewater (MTWW) was used as catholyte. Simultaneous organic matters and nitrogen removal at the cathode was observed, and majority of contaminants reduced were accomplished within acclimating period (AP). Concerning nitrogen removal, aerobic and anaerobic microenvironment could be formed within the cathodic biofilms, and both heterotrophic denitrification and bioelectrochemical denitrification were involved. Also, it was demonstrated that organic matters and ammonium could have detrimental effects on voltage output, but it could retrieve finally. Similar maximum power densities were obtained during stage1 (1.20Wm−3), stage2 (1.24Wm−3) and stage3 (1.32Wm−3). However, overpotential for oxygen reduction was investigated due to lower bacteria activity at cathode, which could major limitation for energy recovery. 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subjects Ammonia - metabolism
Bioelectric Energy Sources - microbiology
Biological Oxygen Demand Analysis
Buffers
COD and nitrogen removal
Denitrification
Electrodes
Heterotrophic Processes
Microbial fuel cell
Mustard Plant
Nitrogen - isolation & purification
Oxygen - metabolism
Saline mustard tuber wastewater
Self-buffered catholyte
Waste Water
title Performance of mixed-species biocathode microbial fuel cells using saline mustard tuber wastewater as self-buffered catholyte
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