title: Anaerobic co-digestion of vegetable waste and swine wastewater in high-rate horizontal reactors with fixed bed.
abstract: Considering the high waste generation that comes from agriculture and livestock farming, as well as the demand for natural gas, it is necessary to develop sustainable technologies which can reduce environmental impact. There is no available literature on the use of high-rate horizontal anaerobic reactors with fixed bed (HARFB) and continuous feed for the co-digestion of vegetable wastes (VW) and swine wastewater (SW). The aim of this work was to evaluate the reactor performance in terms of methane production, organic matter consumption, and removal of total and thermotolerant coliforms under different proportions of SW and VW, and organic loading rates (OLR) of 4.0, 5.2 and 11.0g COD (Ld)(-)(1). The mixture of SW and VW in the proportions of 90:10, 80:20 and 70:30 (SW:VW) with those OLRs provided great buffering capacity, with partial alkalinity reaching 3552mgL(-1), thereby avoiding the inhibition of methane production by volatile fatty acids produced during the fermentation process. Higher proportions of VW and higher OLR improved volumetric methane production with a maximum value of 1.08LCH4 (Ld)(-)(1), organic matter removal rates up to 98% and total and thermotolerant coliform removal rates of 99% were also observed.
authors.affiliation: Post-Graduate Program in Agricultural and Livestock Microbiology, Faculty of Agricultural and Veterinary Sciences, Univ Estadual Paulista, Campus of Jaboticabal, Department of Rural Engineering, Laboratory of Environmental Sanitation, 14884-900 Jaboticabal, SP, Brazil.
authors.forename: Raissa Cristina da Silva
authors.initials: RC
authors.lastname: Mazareli
authors.affiliation: Post-Graduate Program in Agricultural and Livestock Microbiology, Faculty of Agricultural and Veterinary Sciences, Univ Estadual Paulista, Campus of Jaboticabal, Department of Rural Engineering, Laboratory of Environmental Sanitation, 14884-900 Jaboticabal, SP, Brazil.
authors.forename: Rose Maria
authors.initials: RM
authors.lastname: Duda
authors.affiliation: Chemistry Department, Paraíba State University, Science and Technology Center, Floriano Peixoto - Bodocongo, 58100-000 Campina Grande, PB, Brazil.
authors.forename: Valderi Duarte
authors.initials: VD
authors.lastname: Leite
authors.affiliation: Faculty of Agricultural and Veterinary Sciences, Univ Estadual Paulista, Campus of Jaboticabal, Department of Rural Engineering, Laboratory of Environmental Sanitation, 14884-900 Jaboticabal, SP, Brazil. Electronic address: raoder@fcav.unesp.br.
authors.forename: Roberto Alves de
authors.initials: RA
authors.lastname: Oliveira
mesh_terms: D000383:Agriculture; D000693:Anaerobiosis; D000818:Animals; D019149:Bioreactors; D013552:Swine; D014675:Vegetables; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater
chemical_list: D062065:Wastewater
keywords: Anaerobic digestion; Biogas; Coliforms; Methane; Organic matter removal; Plug-flow reactor