摘要
针对压实粘土衬里和有限深度含水层等实际情况，考虑填埋场垃圾生物降解效应及土颗粒对污染物的非线性吸附和一级动力降解效应，建立在压实粘土衬里和含水层中描述填埋场渗滤液运移过程的数学模型。通过数值模拟探讨污染物运移过程中非线性吸附物理化学作用和一级动力降解生物化学作用对污染物运移的影响：通过变动参数比较计算与对比分析发现，非线性吸附和一级动力生物降解对污染物运移过程及机理具有显著的影响；穿透曲线变得尖锐而狭窄，峰值点前移，尾部拖长，最大吸附能力对污染物的运移具有显著影响。压实粘土衬里的渗透性是控制污染物运移的重要因素。
The mathematical model is developed for simulating the contaminant transport process of landfill in the compacted clay liner underlying a aquifer with a finite depth, in which effects of both waste bio-degradation and nonlinear sorption as well as first-order dynamic degradation of contaminants are considered. Through numerical computations, the effects of both physico-chemical reaction due to sorption of contaminants on soil skeletons and chemical reaction caused by first-order kinetic degradation of leachats on the contaminant migration processes are studied. A comparative study is made for different combinations of various parameters. It shows that nonlinear sorption and first-order kinetic bio-degradation of contaminants play significantly important roles in the transport of pollutants. Breakthrough curve of compacted clay liners tends to display the following features, （1） the front of the curve becomes sharper and narrower： （2） peak value is forward shifted with heavily unsymmetry with respect to the mass center; and （3） tailing gets longer. The maximum sorption capacity, which is given by factors K2 in Langmuir isothermal equation of sorption and mass density of soils, is used to represent the coupling effect of nonlinear sorption. It is demonstrated that this comprehensive parameter considerably affect the contaminant transport, and the hydraulic conductivity of compacted clay liner is a key factor for the governing migration of pollutants.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期5211-5216,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
教育部跨世纪人才培养计划研究基金（教技函[1999]2号）
中国科学院武汉岩土力学研究所前沿领域基础研究基金
关键词
岩土力学
污染物
非线性吸附
一级生物降解
压实粘土衬里
质量转换
rock and soil mechanics, contaminant
nonlinear sorption
first-orderbiodegradatiom compacted clay liner
mass transformation
