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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Evaluation of deep groundwater development for arsenic mitigation in western Bangladesh
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Evaluation of deep groundwater development for arsenic mitigation in western Bangladesh

机译：孟加拉国西部地下水深层开发对缓解砷的评估

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Groundwater contamination by arsenic frequently occurs in western Bangladesh. Integrated hydrogeological studies were carried out by the Japan International Cooperation Agency (JICA) in the Jessore, Jhenaidah and Chuadanga districts to assess the possibility of supplying safe drinking water from deep aquifers. The subsurface geology of up to 300 m in depth was classified into 5 formations (viz. A to E formations in descending order). Thick clay facies are found in C formation in the Jessore district, however, clay facies are absent in the Jhenaidah and Chuadanga districts. The clay layer separates deep aquifers from shallow aquifers, and controls vertical groundwater flow. The results of core sample analysis showed that high arsenic contents of more than 30 ppm were found not only from shallow clay but also even from deep clay below 200 m. However, the arsenic concentrations in groundwater were generally below 0.05 mg/L in the deep aquifers. The simulation study using a vertical 2-D groundwater model indicates that deep groundwater will not be contaminated by arsenic in shallow groundwater when the piezometric heads of the deep aquifers are higher than the shallow aquifers. However, the simulation results indicate that overexploitation of the deep aquifers will cause arsenic contamination in deep aquifers due to the downward movement of contaminated shallow groundwater when no sorption takes place in the sediments. These results suggest that groundwater management and control of groundwater pumpage in deep aquifers are crucial for sustainable supply of arsenic safe deep groundwater in western Bangladesh.
机译：孟加拉国西部经常发生砷对地下水的污染。日本国际合作署（JICA）在Jessore，Jhenaidah和Chuadanga地区进行了综合水文地质研究，以评估从深层含水层供应安全饮用水的可能性。深度最大为300 m的地下地质分为5个地层（降序为A到E地层）。杰索尔地区的C地层中发现了厚黏土相，然而，杰纳伊达（Jhenaidah）和Chuadanga地区却没有黏土相。粘土层将深层含水层与浅层含水层分开，并控制垂直地下水流。岩心样品分析结果表明，不仅从浅层粘土中发现高砷含量都超过30 ppm，甚至在200 m以下的深层粘土中也发现了高砷含量。但是，在深层含水层中，地下水中的砷浓度通常低于0.05 mg / L。使用垂直二维地下水模型进行的模拟研究表明，当深层含水层的测压头高于浅层含水层时，深层地下水不会被浅层地下水中的砷污染。然而，模拟结果表明，当沉积物中未发生吸附时，由于受污染的浅层地下水的向下运动，深层含水层的过度开采将导致深层含水层中的砷污染。这些结果表明，深层含水层中的地下水管理和地下水抽取控制对于孟加拉国西部可持续供应砷安全的深层地下水至关重要。

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