Assessment of soil and groundwater contamination at a former Tannery district in Dhaka, Bangladesh
Assessment of soil and groundwater contamination at a former Tannery district in Dhaka, Bangladesh
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DOI：
10.1007/s10653-019-00457-6
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发表时间：
2019-11-07
影响因子：
4.2
通讯作者：
Pichtel, John
中科院分区：
文献类型：
--
作者：
Alam, Md Shahin;Han, Bangshuai;Pichtel, John
孟加拉国皮革加工业的无控制和无计划发展污染了土地和水，引发了对公共卫生的担忧。哈扎里巴格位于达卡西南部，自20世纪60年代以来一直是该市主要的皮革加工区。为了减轻环境污染和对哈扎里巴格及下游居民的公共卫生风险，启动了一个搬迁项目，以消除制革业。然而，必须评估和/或补救前工业场地的土壤和地下水质量状况，以供商业和住宅使用。从10个站点收集土壤和测试的浓度的潜在有毒金属（铅，铬，锌，铜，镍和镉），和地下水收集从6个站点和分析的理化参数和潜在的有毒金属。土壤中铬、锌和铜的浓度超过了欧洲联盟允许的最高浓度。一个地点的深层地下水铬浓度超过了孟加拉国能源部的最大限值;然而，深层地下水的总体质量为良好至优秀。哈扎里巴格土壤和地下水污染的空间变化表明，污染物没有横向扩散。根据当地条件，目前的技术，污染程度，时间和成本，以及操作的便利性，它建议，土壤冲洗，电动力学和/或植物修复可能是受影响的土壤和地下水的修复在哈扎里巴格区的选择。
The uncontrolled and unplanned development of leather processing industries in Bangladesh has contaminated land and water, prompting concerns for public health. Hazaribagh, located in the southwestern part of Dhaka, has been the city's principal leather processing zone since the 1960s. In order to alleviate the environmental contamination and public health risks to citizens of Hazaribagh and downstream, a relocation project was launched to remove the tanning industry. However, soil and groundwater quality conditions of the former industrial sites must be assessed and/or remediated for commercial and residential use. Soil was collected from ten sites and tested for concentrations of potentially toxic metals (Pb, Cr, Zn, Cu, Ni and Cd), and groundwater was collected from six sites and analyzed for physiochemical parameters and potentially toxic metals. Concentrations of soil Cr, Zn and Cu exceeded the European Union maximum permissible concentrations. Deep groundwater Cr concentration in one location exceeded the Bangladesh DoE maximum limits; however, deep groundwater is overall of good-to-excellent quality. Spatial variations of soil and groundwater contamination in Hazaribagh indicate that contaminants have not spread laterally. Based on local conditions, current technologies, contamination level, time and cost, and ease of operation, it is suggested that soil flushing, electrokinetics and/or phytoremediation could be options for remediation of affected soil and groundwater in the Hazaribagh district.