黄土中渗滤液的迁移勘察与数值分析

发布时间：2018-04-20 21:11

  本文选题：垃圾填埋场 + 渗滤液　； 参考：《浙江大学学报(工学版)》2016年06期

【摘要】：在西北黄土地区某填埋场进行钻孔取样和渗滤液水位测试,在室内对不同深度土样的Cl-和COD质量浓度进行测试分析,获得该填埋场运行19a后渗滤液在底部压实及天然黄土层迁移情况.针对该填埋场,建立污染物迁移的二维有限元数值模型,通过实测数据的反演分析率定出Cl-和COD在场底土层中的迁移参数,并对该填埋场继续运行至50a时污染物的迁移进行预测.测试结果表明:该填埋场运行19a后COD和Cl-在压实及天然黄土层中最大竖向迁移深度分别为3m和7m,水平向迁移距离有限,黄土对COD具有较强的吸附阻滞作用.模拟预测结果表明:在18.5m高渗滤液水头作用下,填埋场运行50a时渗滤液中COD和Cl-的最大迁移深度分别达5m和15m.
[Abstract]:Borehole sampling and leachate water level test were carried out at a landfill site in the loess region of northwest China, and Cl- and COD mass concentrations of soil samples of different depths were measured and analyzed in laboratory. After 19 years of operation, the landfill leachate was compacted at the bottom and migrated in natural loess layer. For the landfill, a two-dimensional finite element numerical model for pollutant transport is established, and the migration parameters of Cl- and COD are determined by the inversion analysis rate of measured data. The transport of pollutants was predicted when the landfill continued to run for 50 years. The test results show that the maximum vertical migration depth of COD and Cl- in compacted and natural loess is 3m and 7m respectively after 19 years of operation, and the horizontal migration distance is limited. Loess has a strong adsorption block to COD. The simulation results show that under the action of 18.5m high leachate head, the maximum migration depth of COD and Cl- in leachate is 5 m and 15 m respectively when the landfill runs for 50 years.
【作者单位】： 浙江大学软弱土与环境土工教育部重点实验室;
【基金】：国家“863”高技术研究发展计划资助项目(2012AA062601)
【分类号】：TU993;X144
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本文编号：1779459