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首页> 外文期刊>Environmental Science and Pollution Research >Contaminant transport in the sub-surface soil of an uncontrolled landfill site in China: site investigation and two-dimensional numerical analysis
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Contaminant transport in the sub-surface soil of an uncontrolled landfill site in China: site investigation and two-dimensional numerical analysis

机译：中国一个不受控制的垃圾填埋场地下土壤中的污染物迁移：现场调查和二维数值分析

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摘要

A field investigation of contaminant transport beneath and around an uncontrolled landfill site in Huainan in China is presented in this paper. The research aimed at studying the migration of some chemicals present in the landfill leachate into the surrounding clayey soils after 17 years of landfill operation. The concentrations of chloride and sodium ions in the pore water of soil samples collected at depths up to 15 m were obtained through an extensive site investigation. The contents of organic matter in the soil samples were also determined. A two-dimensional numerical study of the reactive transport of sodium and chloride ion in the soil strata beneath and outside the landfill is also presented. The numerical modelling approach adopted is based on finite element/finite difference techniques. The domain size of approximately 300 x 30 m has been analysed and major chemical transport parameters/mechanisms are established via a series of calibration exercises. Numerical simulations were then performed to predict the long-term behaviour of the landfill in relation to the chemicals studied. The lateral migration distance of the chloride ions was more than 40 m which indicates that the advection and mechanical dispersion are the dominant mechanism controlling the contaminant transport at this site. The results obtained from the analysis of chloride and sodium migration also indicated a non-uniform advective flow regime of ions with depth, which were localised in the first few metres of the soil beneath the disposal site. The results of long-term simulations of contaminant transport indicated that the concentrations of ions can be 10 to 30 times larger than that related to the allowable limit of concentration values. The results of this study may be of application and interest in the assessment of potential groundwater and soil contamination at this site with a late Pleistocene clayey soil. The obtained transport properties of the soils and the contaminant transport mechanisms can also be used for the design of engineered barriers for the control of the long-term pollution of the site.
机译：本文对中国淮南一个不受控制的垃圾填埋场下方和周围的污染物迁移进行了现场调查。该研究旨在研究垃圾填埋场运营17年后，垃圾填埋场渗滤液中存在的某些化学物质向周围黏土的迁移情况。通过广泛的现场调查，获得了土壤样本孔隙水中氯和钠离子的浓度，该浓度最高可达15 m。还测定了土壤样品中有机物的含量。还提供了一个二维数值研究钠和氯离子在垃圾填埋场内外的土壤层中的反应性传输的方法。所采用的数值建模方法基于有限元/有限差分技术。分析了大约300 x 30 m的区域尺寸，并通过一系列校准练习确定了主要的化学传输参数/机理。然后进行了数值模拟，以预测垃圾填埋场相对于所研究的化学品的长期行为。氯离子的横向迁移距离大于40 m，这表明对流和机械分散是控制该位置污染物迁移的主要机制。从氯离子和钠离子迁移的分析结果还表明，离子的对流流动方式不均匀，且深度较深，其分布在处置场下土壤的前几米。污染物迁移的长期模拟结果表明，离子的浓度可以是与允许的浓度限值相关的离子浓度的10到30倍。这项研究的结果可能对评估晚更新世黏土在该地点的潜在地下水和土壤污染具有应用价值和兴趣。所获得的土壤迁移特性和污染物迁移机制也可用于设计隔离屏障，以控制场地的长期污染。

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