Selection of electrogenic bacteria for microbial fuel cell in removing Victoria blue R from wastewater

This study was conducted to select electrogenic bacteria from wastewater sludge. Phylogenetic analysis revealed that Proteobacteria was the dominant phylum in the microbial fuel cell (MFC) during the decomposition process of organic pollutants. Five culturable bacteria strains - namely, Bacillus sub...

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Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2018-01, Vol.53 (2), p.108-115
Main Authors: Chen, Chih-Yu, Tsai, Teh-Hua, Wu, Pei-Ssu, Tsao, Shuo-En, Huang, Yu-Shan, Chung, Ying-Chien
Format: Article
Language:English
Subjects:
Bacteria
Biochemical fuel cells
Biodegradation
Bioremediation
Citrobacter
Color removal
Demethylation
Dyes
Electric power generation
Electricity
Electricity generation
electrogenic bacteria
Feasibility studies
Fuel cells
Fuel technology
microbial fuel cell
Microorganisms
Phylogeny
Pollutants
Shock loading
Sludge
Strains (organisms)
Victoria blue R
Wastewater
Wastewater analysis
Wastewater purification
Wastewater treatment
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Summary:This study was conducted to select electrogenic bacteria from wastewater sludge. Phylogenetic analysis revealed that Proteobacteria was the dominant phylum in the microbial fuel cell (MFC) during the decomposition process of organic pollutants. Five culturable bacteria strains - namely, Bacillus subtilis, Flavobacterium sp., Aeromonas hydrophila, Citrobacter freundii, and Stenotrophomonas sp. - have a double potential in dye removal and electricity generation. We inoculated the mixed electrogenic bacteria at a specific ratio and treated them with a triphenylmethane dye, Victoria blue R (VBR), to evaluate their electricity generation ability for the artificial and real wastewater. The results of the VBR shock-loading experiment indicated that the inoculated MFC could adapt to shock loading in 1-2 days and exhibited high removal efficiency (95-100%) for 100-800 mg L −1 VBR with a power density of 8.62 ± 0.10 to 34.81 ± 0.25 mW m −2 . The selected electrogenic bacteria in the MFC could use VBR as only electron donor for power generation. The matrix effects of the real wastewater on VBR removal and electricity generation of MFC were insignificant. VBR degradation by the electrogenic bacteria involves a stepwise demethylation process to yield partially dealkylated VBR species. In addition, these results demonstrate the feasibility of inoculating culturable bacteria strains to develop an efficient MFC for purifying wastewater.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2017.1377580