Hydrogeochemistry of Alkaline Steel Slag Leachates in the UK
Hydrogeochemistry of Alkaline Steel Slag Leachates in the UK
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DOI：
10.1007/s11270-008-9725-9
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
William M. Mayes;P. Younger;J. Aumonier
中科院分区：
文献类型：
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作者：
William M. Mayes;P. Younger;J. Aumonier
钢渣处理场的排水可能是极端碱性的，是地表水和地下水的污染源。提供了英国7个高碱性(pH >； 10)钢渣表面排放物的水文地球化学数据。虽然所有排泄物中都一致存在Ca-OH型地下水，但场地内和场地之间的水化学相存在明显的差异，反映了天然的水化学、来源物质和水文地质背景。钢渣堆放场的污染问题由来已久，在一个水质记录可以追溯到30年前的地点得到了突显。渗滤液中Al、B、Ba、Fe、Sr、V元素的含量普遍低于地表水水质标准，偶尔还存在铬、钼、镍、铅元素。一些被监测的金属(Al、Fe、Ni、V)在方解石为主的沉淀物中以方解石为主的沉淀物出现后从溶液中流失，这些沉淀物在所有地点都以高达100ug m−2day−1的速度迅速形成。本文讨论了溶液和沉积物中潜在问题微量元素的低浓度问题，并就开发经济可行的高碱性工业排放物被动处理湿地进行了讨论。
Drainage from steel slag disposal sites can be extremely alkaline and a source of pollution to surface and ground waters. Data is presented detailing the hydrogeochemistry of seven highly alkaline (pH > 10) steel slag surface discharges in the UK. While there is the consistent presence of Ca–OH type groundwater in all the discharges, there are clear disparities in hydrochemical facies within and between sites, reflecting native hydrochemistry, source material and hydrogeological setting. The longevity of the pollution problem from steel slag disposal sites is highlighted at one site where the water quality records date back three decades. The consistent presence of Al, B, Ba, Fe, Sr, V and occasional presence of Cr, Mo, Ni, Pb were found at concentrations typically below surface water quality standards in the leachates. Some of the monitored metals (Al, Fe, Ni, V) were found to be lost from solution downstream of emergence in calcite-dominated precipitates which rapidly form at all sites at rates up to 100 g m−2day−1. The low concentrations of potentially problematic trace elements in both solution and the sediments are discussed with regard development of economically viable passive treatment wetlands for highly alkaline industrial discharges.