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Remediation of Acid Rock Discharges

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The objective of this work is to develop the fundamental chemistry as well as treatment strategies for the management of an aluminum containing acid rock discharge. Acid rock discharges typically originate from aqueous interactions with pyritic rock (FeS2), and have similar chemistries to “acid mine drainage”. Major earth moving operations can inadvertently expose buried naturally occurring pyritic containing soils and incorporate these soils into construction site “fill materials” whereupon they can interact with ground waters producing an acid discharge. These acid discharges can then develop significant aluminum levels as a result of the interaction of acidic waters with clay containing soils. Contaminated groundwaters enter surface waters either as direct discharges or as result of seeps on or nearby the property in question. Alternative passive and active treatment strategies are proposed for on-site contaminant management. Given the environmental impact of such discharges and prevalence of excavation works in acid rock containing areas, this work finds broad applicability in ARD treatment design as well as construction planning.
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Document Type: Research Article

Publication date: 2008-01-01

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