title: Thermochemical pretreatment and anaerobic digestion of dairy cow manure: Experimental and economic evaluation.
abstract: The aim of this study was to assess technically and economically the application thermochemical pretreatment in the anaerobic digestion of dairy cow manure. After selecting the optimum substrate to inoculum (S/I) ratio in a preliminary BMP test, the following tests compared 20 different pretreatment conditions varying temperature (100 and 37°C), exposure time (5 and 30min and 12 and 24h) and chemical doses (0.5, 2, 6 and 10% of HCl or NaOH). The highest value of maximum production rate was achieved at an S/I ratio of 0.25gVSsgVSi-1. The major improvements of the methane potential were 23.6% with 10% of NaOH at 100°C for 5min and 20.6% with 2% of HCl at 37°C. The technical-economic analysis showed that the implementation of neither thermal alkali nor thermal-acid pretreatment would be feasible and the conventional one-step anaerobic digestion outperforms both alternatives.
authors.affiliation: Environmental and Chemical Technology Group, Department of Chemistry, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Minas Gerais, Brazil.
authors.forename: Fabiana
authors.initials: F
authors.lastname: Passos
authors.affiliation: Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Chile.
authors.forename: Valentina
authors.initials: V
authors.lastname: Ortega
authors.affiliation: Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Chile; INRIA-Chile, Avenida Apoquindo 2827, piso 12, Las Condes, Santiago, Chile. Electronic address: andres.donoso@pucv.cl.
authors.forename: Andrés
authors.initials: A
authors.lastname: Donoso-Bravo
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels / Q000032:analysis; D001709:Biotechnology / Q000191:economics* / Q000379:methods*; D002417:Cattle; D003362:Cost-Benefit Analysis; D003612:Dairying; D005260:Female; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000096:biosynthesis; D008962:Models, Theoretical; D013696:Temperature
chemical_list: D056804:Biofuels; D008372:Manure; D008697:Methane
keywords: Agricultural waste; Bioenergy; Biogas; Methane; Modeling; Pre-treatment