Effect of Consolidation on VOC Transport Through a GM/GCL Composite Liner System

摘要：

　　This paper presents the results of a numerical investigation of the transport of a volatile organic compound(VOC)through a composite liner system comprising a geomembrane(GM)overlying and in intimate contact with a geosynthetic clay liner(GCL),which is commonly used as an engineered barrier for containment of solid waste.The simulations were performed using the established CST2 model(i.e.,Consolidation and Solute Transport 2).The results are presented in the form of VOC mass flux,cumulative VOC mass outflow,and distribution of VOC concentration within the GCL.Consolidation of the 10-mm-thick GCL is shown to result in a decrease in the thickness,void ratio,and effective diffusion coefficient of 41%,49%,and 72%,respectively,such that the steady-state TCE mass flux and cumulative TCE mass outflow at the bottom of the GCL decreased by 47%and 43%,respectively,relative to results for traditional diffusive simulations that ignore the effect of consolidation.Thus,despite the thinness of the GCL,the effect of consolidation on the transport properties of the GCL can result in a significant decrease in VOC transport through a composite GM/GCL liner system.

关键词： Consolidation Contaminant transport Geomembrane Geosynthetic clay liner Numerical modelling

作者: Hefu Pu Charles D.Shackelford Patrick J.Fox

作者单位: Huazhong University of Science and Technology,Wuhan 430074,Hubei,China Colorado State University,Fort Collins,CO 80523,USA Pennsylvania State University,University Park,PA 16802,USA

会议类型: 国际会议

会议名称: The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)

会议地点: 杭州

会议语种:英文

页码: 601-607

在线出版日期: 2018-10-28（万方平台首次上网日期，不代表论文的发表时间）