A novel time-series-based kinetic model for degradation of municipal solid waste under different oxygen concentrations  

作　　者：Fangming Xu Junlong Huang Zhenjiang Zhuo Dong Xie Jiahui Yuan Yanjun Liu Hongtao Wang 

机构地区：[1]School of Environment,Tsinghua University,Beijing 100084,China [2]School of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China

出　　处：《Frontiers of Environmental Science & Engineering》2025年第2期79-90,共12页环境科学与工程前沿(英文)

基　　金：supported by the National Natural Science Foundation of China (No. 42177177).

摘　　要：Aeration is pivotal in accelerating landfill stabilization.Biodegradation kinetic models of landfills have not fully accounted for the uneven distribution of oxygen during aerobic in situ stabilization,owing to the high heterogeneity of landfills.In this study,a successive degradation of organic matter(SDOM)model is proposed to calculate the reaction rate constant of municipal solid waste(MSW).The SDOM model assumes that organic matter(OM)is composed of n independent shares,with each share starting to degrade at different times.However,all fractions degrade according to first-order kinetics once they enter the reaction phase.In this study,degradation tests of typical organic matter in landfills were conducted under varying oxygen concentrations,and the reaction rates for each degradation test were calculated using the SDOM model.Subsequently,a model was developed to simulate the variation in the reaction rate constant with the oxygen concentration.Superposition tests on multiple types of organic matter were conducted to further validate the superposition principle of the degradation process.Model verification using real waste data revealed a reaction rate constant of 0.12,demonstrating a better fit compared to the Monod model and traditional first-order kinetic model,as well as the highest accuracy in the calculation of CO_(2) produced in the degradation process.The SDOM model can help to understand the degradation mechanism of the aerobic in situ stabilization of landfills in a better manner.

关 键 词：Landfill Time-series-based model Aerobic stabilization Organic matter biodegradation 

分 类 号：X70[环境科学与工程—环境工程]