title: Dual-fuel production from restaurant grease trap waste: bio-fuel oil extraction and anaerobic methane production from the post-extracted residue.
abstract: An effective way for restaurant grease trap waste (GTW) treatment to generate fuel oil and methane by the combination of physiological and biological processes was investigated. The heat-driven extraction could provide a high purity oil equivalent to an A-grade fuel oil of Japanese industrial standard with 81-93 wt% of extraction efficiency. A post-extracted residue was treated as an anaerobic digestion feedstock, and however, an inhibitory effect of long chain fatty acid (LCFA) was still a barrier for high-rate digestion. From the semi-continuous experiment fed with the residual sludge as a single substrate, it can be concluded that the continuous addition of calcium into the reactor contributed to reducing LCFA inhibition, resulting in the long-term stable operation over one year. Furthermore, the anaerobic reactor performed well with 70-80% of COD reduction and methane productivity under an organic loading rate up to 5.3g-COD/L/d.
authors.affiliation: Center for 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 for 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: School of Engineering, University of Hyogo, 2167 Shohsa, Himeji 671-2201, Japan.
authors.forename: Kouji
authors.initials: K
authors.lastname: Maeda
authors.affiliation: College of Industrial Technology, Nihon University, 1-2-1 Izumicho, Narashino 275-8575, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Tsuji
authors.affiliation: Center for 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: Kaiqin
authors.initials: K
authors.lastname: Xu
mesh_terms: D000693:Anaerobiosis; D061249:Batch Cell Culture Techniques; D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D005232:Fatty Acids, Volatile / Q000032:analysis; D005648:Fuel Oils; D005740:Gases / Q000032:analysis; D006358:Hot Temperature; D008697:Methane / Q000096:biosynthesis*; D012147:Restaurants; D012722:Sewage / Q000737:chemistry; D014865:Waste Disposal, Fluid; D014866:Waste Products
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D005648:Fuel Oils; D005740:Gases; D012722:Sewage; D014866:Waste Products; D008697:Methane
keywords: Bio-fuel; Bio-methane; Grease trap waste; Long chain fatty acid