title: Thermophilic anaerobic co-digestion of organic fraction of municipal solid waste (OFMSW) with food waste (FW): Enhancement of bio-hydrogen production.
abstract: Bio-hydrogen production from dry thermophilic anaerobic co-digestion (55°C and 20% total solids) of organic fraction of municipal solid waste (OFMSW) and food waste (FW) was studied. OFMSW coming from mechanical-biological treatment plants (MBT plants) presents a low organic matter concentration. However, FW has a high organic matter content but several problems by accumulation of volatile fatty acids (VFAs) and system acidification. Tests were conducted using a mixture ratio of 80:20 (OFSMW:FW), to avoid the aforementioned problems. Different solid retention times (SRTs) - 6.6, 4.4, 2.4 and 1.9 days - were tested. It was noted that addition of food waste enhances the hydrogen production in all the SRTs tested. Best results were obtained at 1.9-day SRT. It was observed an increase from 0.64 to 2.51 L H2/L(reactor) day in hydrogen productivity when SRTs decrease from 6.6 to 1.9 days. However, the hydrogen yield increases slightly from 33.7 to 38 mL H2/gVS(added).
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), 11510 Puerto Real, Cádiz, Spain. Electronic address: ruben.angeriz@uca.es.
authors.forename: Rubén
authors.initials: R
authors.lastname: Angeriz-Campoy
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), 11510 Puerto Real, Cádiz, Spain.
authors.forename: Carlos J
authors.initials: CJ
authors.lastname: Álvarez-Gallego
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz - International Campus of Excellence (ceiA3), 11510 Puerto Real, Cádiz, Spain.
authors.forename: Luis I
authors.initials: LI
authors.lastname: Romero-García
mesh_terms: D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000032:analysis; D002947:Cities; D005232:Fatty Acids, Volatile / Q000032:analysis; D005502:Food; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D009930:Organic Chemicals / Q000032:analysis*; D012722:Sewage / Q000737:chemistry; D062611:Solid Waste / Q000032:analysis*; D012995:Solubility; D013696:Temperature; D013997:Time Factors
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D009930:Organic Chemicals; D012722:Sewage; D062611:Solid Waste; D002244:Carbon; D006859:Hydrogen
keywords: Bio-hydrogen; Co-digestion; Food waste; Organic fraction of municipal solid waste; Solid retention time