title: Evaluation of organic matter removal and electricity generation by using integrated microbial fuel cells for wastewater treatment.
abstract: A floating all-in-one type of microbial fuel cell (Fa-MFC) that allows simple operation and installation in existing wastewater reservoirs for decomposition of organic matter was designed. A prototype cell was constructed by fixing a tubular floater to an assembly composed of a proton-exchange membrane and an air-cathode. To compare anode materials, carbon-cloth anodes or carbon-brush anodes were included in the assembly. The fabricated assemblies were floated in 1-L beakers filled with acetate medium. Both reactors removed acetate at a rate of 133-181 mg/L/d. The Fa-MFC quipped with brush anodes generated a 1.7-fold higher maximum power density (197 mW/m(2)-cathode area) than did that with cloth anodes (119 mW/m(2)-cathode area). To evaluate the performance of the Fa-MFCs on more realistic substrates, artificial wastewater, containing peptone and meat extract, was placed in a 2-L beaker, and the Fa-MFC with brush anodes was floated in the beaker. The Fa-MFC removed the chemical oxygen demand of the wastewater at a rate of 465-1029 mg/L/d, and generated a maximum power density of 152 mW/m(2)-cathode area. When the Fa-MFC was fed with actual livestock wastewater, the biological oxygen demand of the wastewater was removed at a rate of 45-119 mg/L/d, with electricity generation of 95 mW/m(2)-cathode area. Bacteria related to Geobacter sulfurreducens were predominantly detected in the anode biofilm, as deduced from the analysis of the 16S rRNA gene sequence.
authors.affiliation: a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Yamashita
authors.affiliation: a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan.
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Ishida
authors.affiliation: a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan.
authors.forename: Akifumi
authors.initials: A
authors.lastname: Ogino
authors.affiliation: a Animal Waste Management and Environment Division , NARO Institute of Livestock and Grassland Science , 2 Ikenodai, Tsukuba , Ibaraki 305-0901 , Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yokoyama
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D001674:Bioelectric Energy Sources; D019149:Bioreactors / Q000382:microbiology; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D045302:Geobacter / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D012336:RNA, Ribosomal, 16S / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: all-in-one architecture; electricity generation; floating; microbial fuel cells; wastewater treatment