title: Improving performance of microbial fuel cell while controlling methanogenesis by Chaetoceros pretreatment of anodic inoculum.
abstract: Loss of substrate due to methanogenesis reduces Coulombic efficiency (CE) of the microbial fuel cell (MFC) significantly. Hexadecatrienoic acid present in the marine algae Chaetoceros inhibits the growth of methanogenic archaea. Influence of Chaetoceros pre-treated mixed anaerobic sludge on the electrogenic activity of MFC was evaluated. A MFC inoculated with Chaetoceros pre-treated mixed anaerobic sludge demonstrated maximum CE of 45.18%, with volumetric power density of 21.43W/m(3) and current density of 93A/m(3). Cyclic voltammetry indicated higher electron discharge on the anode surface due to suppression of methanogenesis. Tafel analysis also showed a higher exchange current density and a lower Tafel slope and charge transfer resistance, indicating advantage of this pre-treatment method in reducing the cell internal losses. A 60% reduction in specific methanogenic activity was observed in anaerobic sludge pre-treated with Chaetoceros; emphasizing significance of this pretreatment for suppressing methanogenesis and its utility for enhancing electricity generation in MFC.
authors.affiliation: PK Sinha Centre for Bioenergy, Indian Institute of Technology, Kharagpur 721302, India.
authors.forename: P P
authors.initials: PP
authors.lastname: Rajesh
authors.affiliation: School of Water Resources, Indian Institute of Technology, Kharagpur 721302, India.
authors.forename: D A
authors.initials: DA
authors.lastname: Jadhav
authors.affiliation: Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India. Electronic address: ghangrekar@civil.iitkgp.ernet.in.
authors.forename: M M
authors.initials: MM
authors.lastname: Ghangrekar
mesh_terms: D001674:Bioelectric Energy Sources; D057919:Biological Oxygen Demand Analysis; D017377:Diatoms / Q000502:physiology*; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000382:microbiology
chemical_list: D012722:Sewage; D062065:Wastewater
keywords: Chaetoceros; Coulombic efficiency; Cyclic voltammetry; Methanogenesis inhibition; Microbial fuel cells