title: Methane and VFA production in anaerobic digestion of rice straw under dry, semi-dry and wet conditions during start-up phase.
abstract: This work investigates the start-up phase of anaerobic digestion in wet, semi-dry and dry conditions of rice straw analysing the role of volatile fatty acid (VFA) production on process kinetics. Methane production yields and biodegradation kinetics in reactors operated under wet semi-dry and dry conditions were investigated. The experimental results showed a reduction in the specific final methane production yield of 57% and 63% in, respectively, semi-dry (TS = 14.8%) and dry (TS = 23.4%) conditions compared to wet (TS = 4.8%) conditions. The total VFA concentration and speciation are proposed as indicators of process development at different total solids content. High VFA concentrations were found in dry conditions, with a maximum total VFA concentration of 2110 mg/kg in dry conditions, 930 mg/kg in semi-dry conditions and 180 mg/kg in wet conditions.
authors.affiliation: a Department of Civil and Mechanical Engineering , University of Cassino and Southern Lazio , Via Di Biasio, 43-03043 Cassino , FR , Italy.
authors.forename: Flavia
authors.initials: F
authors.lastname: Liotta
authors.affiliation: a Department of Civil and Mechanical Engineering , University of Cassino and Southern Lazio , Via Di Biasio, 43-03043 Cassino , FR , Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Esposito
authors.affiliation: b Department of Civil, Architectural and Environmental Engineering , University of Naples Federico II , Via Claudio, 21, 80125 Naples , Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Fabbricino
authors.affiliation: c Laboratoire Géomatériaux et Environnement (EA 4508) , Université Paris-Est, UPEM , 77454 Marne-la-Vallée , France.
authors.forename: Eric D
authors.initials: ED
authors.lastname: van Hullebusch
authors.affiliation: d UNESCO-IHE Institute for Water Education (UNESCO-IHE) , Westvest 7, 2611 AX Delft , The Netherlands.
authors.forename: Piet N L
authors.initials: PN
authors.lastname: Lens
authors.affiliation: b Department of Civil, Architectural and Environmental Engineering , University of Naples Federico II , Via Claudio, 21, 80125 Naples , Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Pirozzi
authors.affiliation: a Department of Civil and Mechanical Engineering , University of Cassino and Southern Lazio , Via Di Biasio, 43-03043 Cassino , FR , Italy.
authors.forename: Ludovico
authors.initials: L
authors.lastname: Pontoni
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis*; D007700:Kinetics; D012275:Oryza / Q000737:chemistry*; D062611:Solid Waste / Q000032:analysis*; D018505:Waste Management / Q000379:methods*
chemical_list: D005232:Fatty Acids, Volatile; D062611:Solid Waste
keywords: Total solid; dry anaerobic digestion; rice straw; volatile fatty acids