De Visscher Alex, Van Cleemput Oswald
Department of Applied Analytical and Physical Chemistry, Faculty of Agricultural and Applied Biological Sciences, Ghent University, Coupure links 653, B-9000 Gent, Belgium.
Waste Manag. 2003;23(7):581-91. doi: 10.1016/S0956-053X(03)00096-5.
Landfill cover soils oxidize a considerable fraction of the methane produced by landfilled waste. Despite many efforts this oxidation is still poorly quantified. In order to reduce the uncertainties associated with methane oxidation in landfill cover soils, a simulation model was developed that incorporates Stefan-Maxwell diffusion, methane oxidation, and methanotrophic growth. The growth model was calibrated to laboratory data from an earlier study. There was an excellent agreement between the model and the experimental data. Therefore, the model is highly applicable to laboratory column studies, but it has not been validated with field data. A sensitivity analysis showed that the model is most sensitive to the parameter expressing the maximum attainable methanotrophic activity of the soil. Temperature and soil moisture are predicted to be the environmental factors affecting the methane oxidizing capacity of a landfill cover soil the most. Once validated with field data, the model will enable a year-round estimate of the methane oxidizing capacity of a landfill cover soil.
垃圾填埋场覆盖土壤会氧化填埋废物产生的相当一部分甲烷。尽管已付出诸多努力，但这种氧化作用仍难以准确量化。为减少与垃圾填埋场覆盖土壤中甲烷氧化相关的不确定性，开发了一个模拟模型，该模型纳入了斯特藩 - 麦克斯韦扩散、甲烷氧化和甲烷营养菌生长。生长模型根据早期研究的实验室数据进行了校准。模型与实验数据之间具有极好的一致性。因此，该模型非常适用于实验室柱实验研究，但尚未通过现场数据进行验证。敏感性分析表明，该模型对表示土壤中甲烷营养菌最大可达到活性的参数最为敏感。温度和土壤湿度预计是对垃圾填埋场覆盖土壤甲烷氧化能力影响最大的环境因素。一旦通过现场数据验证，该模型将能够全年估算垃圾填埋场覆盖土壤的甲烷氧化能力。
