title: Dynamics of oxygen supply and consumption during mainstream large-scale composting in China.
abstract: This study characterized some physicochemical and biological parameters to systematically evaluate the dynamics of oxygen supply and consumption during large-scale trough composting in China. The results showed that long active phases, low maximum temperatures, low organic matter losses and high pore methane concentrations were observed in different composting layers. Pore oxygen concentrations in the top, middle and bottom layers maintained <5vol.% for 40, 42 and 45days, respectively, which accounted for more than 89% of the whole period. After each mechanical turning, oxygen was consumed at a stable respiration rate to a concentration of 5vol.% in no more than 99min and remained anaerobic in the subsequent static condition. The daily percentage of time under aerobic condition was no more than 14% of a single day. Therefore, improving FAS, adjusting aeration interval or combining turning with forced aeration was suggested to provide sufficient oxygen during composting.
authors: Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China.
authors: Jianfei
authors: J
authors: Zeng
authors: Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China.
authors: Xiuli
authors: X
authors: Shen
authors: Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China.
authors: Lujia
authors: L
authors: Han
authors: Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China. Electronic address: huanggq@cau.edu.cn.
authors: Guangqun
authors: G
authors: Huang
mesh_terms: D019149:Bioreactors; D002681:China; D008372:Manure / Q000032:analysis*; D008697:Methane; D010100:Oxygen / Q000032:analysis / Q000378:metabolism*; D010101:Oxygen Consumption; D012037:Refuse Disposal / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
chemical_list: D008372:Manure; D014866:Waste Products; D008697:Methane; D010100:Oxygen
keywords: Dynamics; Large-scale trough composting; Oxygen consumption; Oxygen supply; Pore oxygen concentration