title: Targeted modification of organic components of municipal solid waste by short-term pre-aeration and its enhancement on anaerobic degradation in simulated landfill bioreactors.
abstract: Pre-aeration is effective on regulating subsequent anaerobic degradation of municipal solid waste (MSW) with high organic fractions during landfilling. The strength of pre-aeration should be optimized to intentionally remove some easily biodegradable fractions while conserve bio-methane potential as much as possible. This study investigates the evolution of organic components in MSW during 2-14days pre-aeration process and its impacts on subsequent anaerobic degradation in simulated landfill bioreactors. Results showed that a 6-day pre-aeration enabled to develop a thermophilic stage, which significantly accelerated biodegradation of organics except lignocelluloses, with removal rates of 42.8%, 76.7% and 25.1% for proteins, carbohydrates and lipids, respectively. Particularly, ammonia from accelerated ammonification in the thermophilic stage neutralized VFAs generated from anaerobic landfilling. As a result, the MSW with 6-day pre-aeration obtained the highest methane yield 123.4NL/kg dry matter. Therefore, it is recommended to interrupt pre-aeration before its cooling stage to switch to anaerobic landfilling.
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 10084, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Ni
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 10084, China. Electronic address: jgliu@tsinghua.edu.cn.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Girotto
authors.affiliation: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors.forename: Raffaello
authors.initials: R
authors.lastname: Cossu
authors.affiliation: School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing 100048, China.
authors.forename: Guangxia
authors.initials: G
authors.lastname: Qi
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste; D064091:Waste Disposal Facilities
chemical_list: D062611:Solid Waste
keywords: Excessive acidification; Landfilling bioreactor; Municipal solid waste; Organic fractions; Short-term pre-aeration