title: Anaerobic co-digestion of steam-treated Quercus serrata chips and sewage sludge under mesophilic and thermophilic conditions.
abstract: The biodegradation of Quercus serrata chips was evaluated by anaerobic digestion under various steam explosion conditions. In continuous experiments, untreated chips (W₀) and chips steam-treated at less than 1.0 MPa (W₁) and 2.0 MPa (W₄) were co-digested with sewage sludge (S₁ and S₂) taken from two different wastewater treatment plants. The apparent methane yield of W₁ and W₄ co-digested with S₁ (thermophilic) was 261 dm(3)/kgVS (volatile solids) and 248 dm(3)/kgVS, respectively. The apparent methane yield of W₄ co-digested with S₂ was 258 dm(3)/kgVS (mesophilic) and 271 dm(3)/kgVS (thermophilic). Methane production was inhibited by W₀ due to components released during hydrolysis. The methane conversion ratio of pretreated chips obtained in batch experiments varied from 40.5% to 53.8% (mesophilic) and from 49.0% to 63.7% (thermophilic). The methane conversion ratio increased with decreasing acid-soluble lignin content in the chips.
authors.affiliation: Recycling Research Team, Materials and Resources Research Group, Public Works Research Institute, 1-6, Minamihara, Tsukuba, Ibaraki 305-8516, Japan. Electronic address: wanfun55@pwri.go.jp.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: Recycling Research Team, Materials and Resources Research Group, Public Works Research Institute, 1-6, Minamihara, Tsukuba, Ibaraki 305-8516, Japan.
authors.forename: Taira
authors.initials: T
authors.lastname: Hidaka
authors.affiliation: Recycling Research Team, Materials and Resources Research Group, Public Works Research Institute, 1-6, Minamihara, Tsukuba, Ibaraki 305-8516, Japan.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Sakurai
authors.affiliation: Recycling Research Team, Materials and Resources Research Group, Public Works Research Institute, 1-6, Minamihara, Tsukuba, Ibaraki 305-8516, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Tsumori
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D003246:Conservation of Energy Resources; D008697:Methane / Q000032:analysis / Q000737:chemistry; D029963:Quercus / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry
chemical_list: D056804:Biofuels; D008697:Methane; D012722:Sewage; D062065:Wastewater
keywords: Co-digestion; Mesophilic condition; Quercus serrata chips; Steam explosion; Thermophilic condition