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首页> 外文会议>International Congress Arsenic In The Environment >Wide spread arsenic in deeper groundwater of western Bengal basin, West Bengal, India: Implications for sustainable alternate drinking water sources
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Wide spread arsenic in deeper groundwater of western Bengal basin, West Bengal, India: Implications for sustainable alternate drinking water sources

机译：印度西孟加拉邦西孟加拉邦盆地盆地深层地下水域宽阔的砷：对可持续交替饮用水来源的影响

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Availability of safe drinking water is a major concern in the delta plains of the major Himalayan-Tibetan rivers in southern and southeastern Asia. While indiscriminate use of rivers and other surface water bodies for disposal of sewage and industrial waste has rendered them non-potable, natural, non-point source, elevated Arsenic (As) concentrations in groundwater exceeding the World Health Organization's (WHO) guideline value for drinking water of 0.01 mg/L have put millions of people at risk. Hence, finding an alternate, suitable and sustainable drinking-water source has been a priority in these areas. Generally, higher concentrations of dissolved As are found in groundwater of shallower aquifers and several studies have advocated deeper aquifers as a possible safe substitute. Using a composite hydrogeological approach, we demonstrate that regional-scale deeper groundwater As contamination in the western Bengal basin is dependent on the aquifer-aquitard framework and complex redox processes with partial equilibrium under natural flow conditions. Widespread deep irrigation pumping may be drawing shallower, contaminated groundwater down to greater depths. These findings have severe implications on finding alternate drinking water sources, in West Bengal, and adjoining areas of Bangladesh, with plausible similar geological and hydrogeological framework.
机译：安全饮用水的可用性是南部和东南部主要喜马拉雅河畔河流的三角洲平原的主要问题。虽然不分青红皂白地使用河流和其他地表水体来处理污水和工业废物，但由于世界卫生组织（世卫组织）指南价值超过世界卫生组织（世卫组织）指导价值，却将其提供了不饮用，自然，非点源，升高的砷（AS）浓度0.01毫克/升的饮用水使数百万人面临风险。因此，寻找替代，合适的和可持续的饮用水来源是这些领域的优先事项。通常，较高浓度的溶解如在较浅的含水层的地下水中发现，几项研究都倡导更深层次的含水层作为可能的安全替代品。采用复合水文地质方法，我们证明了西孟加拉科盆地中的区域规模更深的地下水依赖于含水层 - 水上框架和复杂的氧化还原过程，在自然流动条件下具有部分均衡。广泛的深度灌溉泵浦可能是浅薄的，污染的地下水下降到更大的深度。这些调查结果对寻找孟加拉国西孟加拉邦和毗邻的孟加拉国地区寻找交替饮用水来源的严重影响，具有合理的类似地质和水文地质框架。

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