title: Treatment of alcohol distillery wastewater using a Bacteroidetes-dominant thermophilic microbial fuel cell.
abstract: Simultaneous electricity generation and distillery wastewater (DWW) treatment were accomplished using a thermophilic microbial fuel cell (MFC). The results suggest that thermophilic MFCs, which require less energy for cooling the DWW, can achieve high efficiency for electricity generation and also reduce sulfate along with oxidizing complex organic substrates. The generated current density (2.3 A/m(2)) and power density (up to 1.0 W/m(2)) were higher than previous wastewater-treating MFCs. The significance of the high Coulombic efficiency (CE; up to 89%) indicated that electrical current was the most significant electron sink in thermophilic MFCs. Bacterial diversity based on pyrosequencing of the 16S rRNA gene revealed that known Deferribacteres and Firmicutes members were not dominant in the thermophilic MFC fed with DWW; instead, uncharacterized Bacteroidetes thermophiles were up to 52% of the total reads in the anode biofilm. Despite the complexity of the DWW, one single bacterial sequence (OTU D1) close to an uncultured Bacteriodetes bacterium became predominant, up to almost 40% of total reads. The proliferation of the D1 species was concurrent with high electricity generation and high Coulombic efficiency.
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Korea.
authors.forename: Phuc Thi
authors.initials: PT
authors.lastname: Ha
authors.forename: Tae Kwon
authors.initials: TK
authors.lastname: Lee
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Rittmann
authors.forename: Joonhong
authors.initials: J
authors.lastname: Park
authors.forename: In Seop
authors.initials: IS
authors.lastname: Chang
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D041963:Bacteroidetes / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms / Q000254:growth & development; D057919:Biological Oxygen Demand Analysis; D057168:Distillation; D004560:Electricity; D055664:Electrochemical Techniques; D007220:Industrial Waste / Q000032:analysis*; D010084:Oxidation-Reduction; D013431:Sulfates / Q000378:metabolism; D013447:Sulfites / Q000378:metabolism; D013696:Temperature; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D000438:Alcohols; D007220:Industrial Waste; D013431:Sulfates; D013447:Sulfites