title: Enhancing anaerobic digestion performance of crude lipid in food waste by enzymatic pretreatment.
abstract: Three lipases were applied to hydrolyze the floatable grease (FG) in the food waste for eliminating FG inhibition and enhancing digestion performance in anaerobic process. Lipase-I, Lipase-II, and Lipase-III obtained from different sources were used. Animal fat (AF) and vegetable oil (VO) are major crude lipids in Chinese food waste, therefore, applied as substrates for anaerobic digestion tests. The results showed that Lipase-I and Lipase-II were capable of obviously releasing long chain fatty acid in AF, VO, and FG when hydrolyzed in the conditions of 24h, 1000-1500μL and 40-50°C. Compared to the untreated controls, the biomethane production rate were increased by 80.8-157.7%, 26.9-53.8%, and 37.0-40.7% for AF, VO, and FG, respectively, and the digestion time was shortened by 10-40d. The finding suggests that pretreating lipids with appropriate lipase could be one of effective methods for enhancing anaerobic digestion of food waste rich in crude lipid.
authors.affiliation: Department of Environmental Science and Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Meng
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Fubo
authors.initials: F
authors.lastname: Luan
authors.affiliation: Department of Environmental Science and Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, China.
authors.forename: Hairong
authors.initials: H
authors.lastname: Yuan
authors.affiliation: China Power Conservation & Environment Protection CO., LTD, Beijing 100020, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Environmental Science and Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, China. Electronic address: xjlibuct@gmail.com.
authors.forename: Xiujin
authors.initials: X
authors.lastname: Li
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D019149:Bioreactors; D004063:Digestion; D005502:Food; D006868:Hydrolysis; D008049:Lipase / Q000737:chemistry*; D050356:Lipid Metabolism; D010938:Plant Oils / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D018505:Waste Management / Q000379:methods*
chemical_list: D010938:Plant Oils; D008049:Lipase
keywords: Anaerobic digestion; Crude lipid; Hydrolysis; Lipase