【作者】 杨清雷； 于德浩； 杨庆； 杨彤； 王康；

【Author】 Yang Qinglei;Yu Dehao;Yang Qing;Yang Tong;Wang Kang;Engineering Research Institute,Shenyang M.A.C.;Institute of Geotechnical Engineering,Dalian University of Technology;

【机构】 沈司设计院； 大连理工大学岩土工程研究所；

【摘要】 弥散系数是预测和研究污染物在垃圾填埋场衬里中迁移的重要参数。确定弥散系数的方法主要有间歇试验与土柱试验两种方式。研究表明土颗粒浓度差是两种试验方法所得结果差异的主要原因。本文采用间歇试验的方法研究了土颗粒浓度对黏土与改良黏土吸附Cd(Ⅱ)的影响,得到以下结论。土料吸附Cd(Ⅱ)的单位吸附量随土颗粒浓度的增大而减小。黏土、活性炭改良黏土、酸活化膨润土改良黏土和黄土改良黏土对Cd(Ⅱ)吸附的临界土颗粒浓度分别为320g/L、280g/L、280g/L和280g/L。平衡时刻单位吸附量分别为0.293mg/g、0.328mg/g、0.332mg/g和0.338mg/g。采用临界土颗粒浓度下的吸附参数可以方便快速地得到更接近真实情况的弥散系数值。更多还原

【Abstract】 The dispersion coefficient is an important parameter to predict and study the migration of contaminants through landfill liner,which can be determined by batch test and column test.A study shows that the soil solids concentration difference is the main reason which affects the test results.The influence of soil solids concentration on Cd(Ⅱ) adsorption on clay and modified clay are studied by batch tests.A series of meaningful conclusions are obtained.The unit equilibrium adsorption amount decreases as soil solids concentration increases.The critical soil solids concentrations of clay and modified clay are found to be 320g/L,280g/L,280g/L and 280g/L,and the critical unit equilibrium adsorption amount are 0.293mg/g,0.328mg/g,0.332mg/g and 0.338mg/g.The dispersion coefficient close to real values can be determined quickly and conveniently with adsorption parameters got under critical soil solids concentrations.更多还原