Application of Contois, Tessier, and first-order kinetics for modeling and simulation of a composting decomposition process.
An integrated model was developed by associating separate degradation kinetics for an array of degradations during a decomposition process, which was considered as a novelty of this study. The raw composting material was divided into soluble, hemi-/cellulose, lignin, NBVS, ash, water, and free air-space. Considering their specific capabilities of expressing certain degradation phenomenon, Contois, Tessier (an extension to Monod kinetic), and first-order kinetics were employed to calculate the biochemical rates. It was found that the degradation of soluble substrate was relatively faster which could reach a maximum rate of about 0.4perhour. The hydrolysis of lignin was rate-limiting with a maximum rate of about 0.04perhour. The dry-based peak concentrations of soluble, hemi-/cellulose and lignin degraders were about 0.9, 0.2 and 0.3kgm(-3), respectively. Model developed, as a platform, allows degradation simulation of composting material that could be separated into the different components used in this study.
Huazhong Agricultural University, Department of Agricultural Engineering, College of Engineering, 1 Shi-zi-shan Street, 430070 Wuhan, China. Electronic address: wangyongjiang@mail.hzau.edu.cn.
Yongjiang
Y
Wang
University of Maryland, Department of Environmental Science and Technology, 0426 Animal Science/Ag Engineering Bldg., College Park, MD 20742, United States.
Freddy
F
Witarsa
D001673:Biodegradation, Environmental; D002482:Cellulose / Q000378:metabolism; D006868:Hydrolysis; D007700:Kinetics; D008031:Lignin / Q000378:metabolism; D008962:Models, Theoretical; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D013696:Temperature; D018505:Waste Management / Q000379:methods; D014867:Water / Q000737:chemistry
D012987:Soil; D014867:Water; D002482:Cellulose; D008031:Lignin
Contois kinetic; Degradation; First-order kinetic; Tessier kinetic