Field and numerical investigation on migration of leachate in loess soil

被引：2
|
作者：
Zhan L.-T. [1 ]
Gong B. [1 ]
Lan J.-W. [1 ]
Wang Y.-Z. [1 ]
Chen Y.-M. [1 ]
机构：
[1] MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2016年 / 50卷 / 06期
关键词：
Compacted loess; Leachate; Long-term prediction; Migration; Natural loess; Refuse landfill; Retardation factor;
D O I：
10.3785/j.issn.1008-973X.2016.06.026
中图分类号：
学科分类号：
摘要：
Borehole sampling and measurement of leachate levels were carried out at a landfill of municipal solid wastes in the Northwest region of China. The soil samples at different depths were collected to determine the mass concentrations of Cl ion and COD in laboratory. The situation of leachate transport in the compacted and natural loess soil strata under the landfill after 19 years' operation was obtained. 2D finite element models were set up to simulate the transport of leachate under the landfill. The model parameters of Cl ion and COD were obtained by back analysis of the measured Cl ion and COD mass concentration profiles. Long-term simulation of 50 years was carried out to predict the migration of Cl ion and COD into the soil strata. The test results show that after 19 years' operation, the vertical migration depth of COD in the compacted and natural loess was 3 m and that for Cl ion was deeper than 7 m, and the horizontal migration distances of Cl ion and COD were limited. Results indicate that the loess has a significant adsorption retardation effect on COD. The simulation results show that, with a leachate head of 18.5 m, the migration depth of Cl ion and COD after 50 years' operation is 15 m and 5 m, respectively. © 2016, Zhejiang University Press. All right reserved.
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页码：1196 / 1202and1213
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