Addressing the Mobilization of Trace Metals in Anaerobic Aquifers
Pearce, Mark S.
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The mobilization of trace metals such as arsenic during Aquifer Storage and Recovery (ASR) activities has hindered the growth in the implementation of ASR technology. A discussion of this issue is provided that outlines the manner in which arsenic is mobilized within the subsurface, methods that have been proposed or implemented to minimize arsenic mobilization, and a more robust chemical solution that reduces or eliminates the mobilization of arsenic in anaerobic aquifers. The chemical solution is designed to prevent the dissolution of pyrite based on Le Chatelier’s Principle and the reaction between dissolved oxygen and sulfides. Finally, the discussion will address the operational and cost effectiveness of this process.