title: Effects of high-pressure extruding pretreatment on MSW upgrading and hydrolysis enhancement.
abstract: High-pressure extruding (HPE) is an efficient technology used to separate municipal solid waste (MSW) into wet (biodegradable) and dry (combustible) fractions. Effects of pressure, 10, 20, 30, and 40MPa on quality upgrading of the MSW and hydrolysis of the wet fraction were examined. TS of the dry fraction increased from 48.5% to 59.4% when the extruding pressure increased from 10 to 40MPa, meanwhile the biochemical methane potential (BMP) of the wet fraction extruded under 40MPa was 674mL CH4/g·VS, 33% higher than that of the organic fraction of the MSW (OFMSW) control. Furthermore, in the initial stage of hydrolysis experiment, the extruded wet fractions had lower pH and higher COD, volatile fatty acids (VFAs) and COD/VFA than those of the OFMSW control. The results confirmed that HPE upgraded the MSW and enhanced hydrolysis of the wet fractions. However, high extruding pressure as 40MPa aggravated the excessive acidification of the wet fractions.
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Xu
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Kong
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: jgliu@tsinghua.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.affiliation: BESG Environmental Engineering Co., Ltd., Beijing Environment Sanitation Engineering Group Co., Ltd, Beijing 100101, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhao
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Guangqi
authors.initials: G
authors.lastname: Zhao
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Amanjol
authors.initials: A
authors.lastname: Bahdolla
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000737:chemistry; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D011312:Pressure; D011506:Proteins / Q000032:analysis / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D011506:Proteins; D062611:Solid Waste; D000641:Ammonia
keywords: Biochemical methane potential; Biodegradable fractions; High-pressure extruding; Hydrolysis; MSW