尼日利亚埃努古两个废弃煤矿排放物的化学特征:对污染和酸性矿井排水的启示

IF 1.1 Q3 MINING & MINERAL PROCESSING
Lauren Akpan, C. I. Adamu
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引用次数: 2

摘要

本研究对尼日利亚东南部两个废弃煤矿附近的水和土壤的化学成分进行了评估,以评估矿井池塘水流对地质环境的影响和酸性矿井排水(AMD)的潜力。测定了pH、阴离子、阳离子、重金属等参数。利用污染负荷指数、因子、富集因子、污染负荷指数和地质堆积指数等混合因子对污染/污染进行评价。pH值在3.4到5.9之间,属于弱酸性到强酸性,是典型的AMD。SO42 -离子浓度为中~高浓度,是矿井水污染的标志。铁、锌、铅和铜是最丰富的重金属。污染负荷指数大于1,表现为水沙质量的逐步恶化。富集因子值高达1,表明有岩源和人为源富集。矿山排土场就像一个水池,可以通过各种再活化过程将有毒重金属释放到水体中。综合岩性、矿物学、化学浓度及环境因素,认为该区存在AMD的生成潜力。富含重金属的矿流,特别是铁,排入附近的水体,成为城市供水的来源。长期饮用来自这些水源的未经处理的水可能对健康有害。建议采取补救措施和持续监测,以实现良好的环境管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Chemical Characteristics of Discharges from Two Derelict Coal Mine Sites in Enugu Nigeria: Implication for Pollution and Acid Mine Drainage
In this study, the chemical composition of water and soils contiguous to two abandoned coal mines in southeastern Nigeria, was assessed to evaluate the impact of water flow from the mines ponds on the geoenvironment and potential for acid mine drainage (AMD). Parameters including the pH, anions and cations, and the heavy metals were measured. These were used to evaluate contamination/pollution using hybrid factors including Pollution Load Index, factors, enrichment factors, pollution load index and index of geoaccumulation. The pH range of 3.4 to 5.9 classified the water as weakly to strongly acidic, typical of AMD. The SO42– ion, which indicates pollution by mine waters, showed moderate to high concentrations. Iron, zinc lead and copper were the most abundant heavy metals. Pollution Load Index values were greater than unity which show progressive deterioration in water and sediment quality. The Enrichment Factor values of up to 1 indicated enrichment through lithogenic and anthropogenic sources. The mine dumps serve as pools that can release toxic heavy metals into the water bodies by various processes of remobilization. Based on the lithology, mineralogy, chemical concentrations and environmental factors, the study has shown that there exists a potential for the generation of AMD. The heavy metals enriched mine flow, especially iron, empty into the nearby water bodies which serve as sources of municipal water supply. Consumption of untreated water over a prolonged period from these water sources may be detrimental to health. Remedial measure and continuous monitoring are recommended for good environmental stewardship.
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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