Steady-state analytical model for vapour-phase VOCs diffusion in layered landfill composite cover systems
Steady-state analytical model for vapour-phase VOCs diffusion in layered landfill composite cover systems
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DOI：
10.1139/cgj-2016-0293
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发表时间：
2017-07
影响因子：
3.6
通讯作者：
H. Xie;Qiao Wang;Huaxiang Yan;Yun-min Chen
中科院分区：
文献类型：
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作者：
H. Xie;Qiao Wang;Huaxiang Yan;Yun-min Chen
建立了一维气相挥发性有机物（VOCs）在由保护层、排水层、土工膜（GMB）和压实粘土衬垫（CCL）组成的四层填埋场复合覆盖系统中的扩散解析模型。分析了含水饱和度（Sr）、吸附和降解对气相VOCs在覆盖系统中扩散的影响。在排水层和保护层中，气相苯浓度剖面随Sr的增加而增大。当Sr1= Sr2=0.5时（Sr1和Sr2分别为保护层和排水层的含水饱和度），CCL层饱和度Sr_4 =0.3时的表面通量分别是Sr_4 =0.7和Sr_4 =0.9时的1.3倍和1560倍。覆铜板对VOCs的吸附作用对覆盖系统性能的影响大于排水层和保护层。当CCL改性后，苯的表面通量和浓度均趋于零。
An analytical model for one-dimensional vapour-phase volatile organic compounds (VOCs) diffusion through four-layered landfill composite cover system consisting of a protective layer, a drainage layer, a geomembrane (GMB), and a compacted clay liner (CCL) is developed. Effects of degree of water saturation (Sr), adsorption, and degradation on vapour-phase VOCs diffusion in cover system were then analyzed. Vapour-phase benzene concentration profile increases with increase of Sr in the drainage layer and protective layer. When Sr1= Sr2=0.5 (Sr1 and Sr2 are degree of water saturation of protective layer and drainage layer, respectively.), surface flux for the case with the degree of water saturation of CCL layer Sr4=0.3 is 1.3 and 1560 times larger than that with Sr4=0.7 and Sr4=0.9, respectively. Effect of adsorption of VOCs in CCL on performance of cover system is more important than that in drainage layer and protective layer. Surface flux and concentration of benzene tends to be zero when CCL is amended ...