title: Improved biogas production from food waste by co-digestion with de-oiled grease trap waste.
abstract: The objective of this study was to assess the feasibility of co-digesting food waste (FW) and de-oiled grease trap waste (GTW) to improve the biogas production. A lab-scale mesophilic digester (MD), a temperature-phased anaerobic digester (TPAD) and a TPAD with recycling (TPAD-R) were synchronously operated under mono-digestion (FW) and co-digestion (FW+de-oiled GTW). Co-digestion increased the biogas yield by 19% in the MD and TPAD-R, with a biogas yield of 0.60L/g VS added. Specific methanogenic activity in the TPAD-R was much higher than that in the MD. In addition to methane, hydrogen at a yield of approximately 1mol/mol hexose was produced in the TPAD-R. Alkalinity was consumed more in the co-digestion than in mono-digestion. Co-digestion resulted in more lipid accumulation in each digester. The MD favored the degradation of lipid and conversion of long-chain fatty acids more than the TPAD and TPAD-R.
authors.affiliation: Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
authors.forename: Li-Jie
authors.initials: LJ
authors.lastname: Wu
authors.affiliation: Center of Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan. Electronic address: kobayashi.takuro@nies.go.jp.
authors.forename: Takuro
authors.initials: T
authors.lastname: Kobayashi
authors.affiliation: Center of Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Kuramochi
authors.affiliation: Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan; Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan.
authors.forename: Yu-You
authors.initials: YY
authors.lastname: Li
authors.affiliation: Center of Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Kai-Qin
authors.initials: KQ
authors.lastname: Xu
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D005232:Fatty Acids, Volatile / Q000032:analysis; D005502:Food; D006863:Hydrogen-Ion Concentration; D009821:Oils / Q000737:chemistry*; D059027:Recycling; D012722:Sewage / Q000382:microbiology; D013696:Temperature; D014835:Volatilization; D014866:Waste Products
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D009821:Oils; D012722:Sewage; D014866:Waste Products
keywords: Anaerobic digestion; Food waste (FW); Grease trap waste (GTW); Long-chain fatty acid (LCFA); Temperature-phased anaerobic digestion (TPAD)