title: Enhancement in hydrogen production by thermophilic anaerobic co-digestion of organic fraction of municipal solid waste and sewage sludge--optimization of treatment conditions.
abstract: Batch dry-thermophilic anaerobic co-digestion (55°C) of organic fraction of municipal solid waste (OFMSW) and sewage sludge (SS) for hydrogen production was studied under several sludge combinations (primary sludge, PS; waste activated sludge, WAS; and mixed sludge, MS), TS concentrations (10-25%) and mixing ratios of OFMSW and SS (1:1, 2.5:1, 5:1, 10:1). The co-digestion of OFMSW and SS showed a 70% improvement in hydrogen production rate over the OFMSW fermentation only. The co-digestion of OFMSW with MS showed 47% and 115% higher hydrogen production potential as compared with OFMSW+PS and OFMSW+WAS, respectively. The maximum hydrogen yield of 51 mL H2/g VS consumed was observed at TS concentration of 20% and OFMSW to MS mixing ratio of 5:1, respectively. The acetic and butyric acids were the main acids in VFAs evolution; however, the higher butyric acid evolution indicated that the H2 fermentation was butyrate type fermentation.
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: vinayiitrp@gmail.com.
authors.forename: Vinay Kumar
authors.initials: VK
authors.lastname: Tyagi
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: Angériz 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. Electronic address: carlosjose.alvarez@uca.es.
authors.forename: C 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. Electronic address: luisisidoro.romero@uca.es.
authors.forename: L I
authors.initials: LI
authors.lastname: Romero García
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002947:Cities; D006859:Hydrogen / Q000378:metabolism*; D009930:Organic Chemicals / Q000302:isolation & purification*; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000737:chemistry*; D062611:Solid Waste / Q000032:analysis*; D012995:Solubility; D013030:Spain; D013696:Temperature; D013997:Time Factors
chemical_list: D009930:Organic Chemicals; D012722:Sewage; D062611:Solid Waste; D006859:Hydrogen
keywords: Dry thermophilic dark fermentation; Hydrogen production; Organic fraction of municipal solid waste; Sewage sludge