title: Municipal waste liquor treatment via bioelectrochemical and fermentation (H2+ CH4) processes: Assessment of various technological sequences.
abstract: In this paper, the anaerobic treatment of a high organic-strength wastewater-type feedstock, referred as the liquid fraction of pressed municipal solid waste (LPW) was studied for energy recovery and organic matter removal. The processes investigated were (i) dark fermentation to produce biohydrogen, (ii) anaerobic digestion for biogas formation and (iii) microbial fuel cells for electrical energy generation. To find a feasible alternative for LPW treatment (meeting the two-fold aims given above), various one- as well as multi-stage processes were tested. The applications were evaluated based on their (i) COD removal efficiencies and (ii) specific energy gain. As a result, considering the former aspect, the single-stage processes could be ranked as: microbial fuel cell (92.4%)> anaerobic digestion (50.2%)> hydrogen fermentation (8.8%). From the latter standpoint, an order of hydrogen fermentation (2277 J g-1CODremovedd-1)> anaerobic digestion (205 J g-1CODremovedd-1)> microbial fuel cell (0.43 J g-1CODremovedd-1) was attained. The assessment showed that combined, multi-step treatment was necessary to simultaneously achieve efficient organic matter removal and energy recovery from LPW. Therefore, a three-stage system (hydrogen fermentation-biomethanation-bioelectrochemical cell in sequence) was suggested. The different approaches were characterized via the estimation of COD balance, as well.
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200, Veszprém, Hungary.
authors.forename: Tamás
authors.initials: T
authors.lastname: Rózsenberszki
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200, Veszprém, Hungary.
authors.forename: László
authors.initials: L
authors.lastname: Koók
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200, Veszprém, Hungary. Electronic address: bakonyip@almos.uni-pannon.hu.
authors.forename: Péter
authors.initials: P
authors.lastname: Bakonyi
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200, Veszprém, Hungary.
authors.forename: Nándor
authors.initials: N
authors.lastname: Nemestóthy
authors.affiliation: Centro de Investigación de Energías Alternativas y Ambiente, Escuela Superior Politécnica de Chimborazo, Chimborazo, Ecuador; Department of Biotechnology, University of Szeged, Szeged, Hungary.
authors.forename: Washington
authors.initials: W
authors.lastname: Logroño
authors.affiliation: Centro de Investigación de Energías Alternativas y Ambiente, Escuela Superior Politécnica de Chimborazo, Chimborazo, Ecuador.
authors.forename: Mario
authors.initials: M
authors.lastname: Pérez
authors.affiliation: Centro de Investigación de Energías Alternativas y Ambiente, Escuela Superior Politécnica de Chimborazo, Chimborazo, Ecuador.
authors.forename: Gladys
authors.initials: G
authors.lastname: Urquizo
authors.affiliation: Centro de Investigación de Energías Alternativas y Ambiente, Escuela Superior Politécnica de Chimborazo, Chimborazo, Ecuador; Instituto de Ciencia, Innovación, Tecnología y Saberes, Universidad Nacional de Chimborazo, Riobamba, Ecuador.
authors.forename: Celso
authors.initials: C
authors.lastname: Recalde
authors.affiliation: Institute of Environmental Engineering, University of Pannonia, Egyetem ut 10, 8200, Veszprém, Hungary.
authors.forename: Róbert
authors.initials: R
authors.lastname: Kurdi
authors.affiliation: Institute of Environmental Engineering, University of Pannonia, Egyetem ut 10, 8200, Veszprém, Hungary.
authors.forename: Attila
authors.initials: A
authors.lastname: Sarkady
mesh_terms: D000693:Anaerobiosis; D001674:Bioelectric Energy Sources; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D005285:Fermentation; D006859:Hydrogen / Q000032:analysis; D008697:Methane / Q000032:analysis; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater
chemical_list: D056804:Biofuels; D006859:Hydrogen; D008697:Methane; D062065:Wastewater
keywords: Biogas; Biohydrogen; Microbial fuel cell; Multi-stage process; OFMSW; Wastewater