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TREATMENT OF MINE DRAINAGE WITH SIGNIFICANT TOPOGRAPHICAL CONSTRAINTS: CASE STUDY OF THE BODENNEC SITE (FRANCE)
Jacob, J.C., M. Save, and Y. Menard.
Mine Water and the Environment [Publication online 3 Mar 2018 prior to print]

The Bodennec lead and zinc mine site produces circumneutral mine drainage that contains 8 mg/L of dissolved iron, whereas the Fe water quality objective is 3 mg/L at the outlet. The water treatment installation in use, based on three settling ponds, could not reach this objective, and the site lacked sufficient surface area to build additional ponds or a passive treatment plant. A pilot-scale NaOH system comprising a pump controlled by a flow meter was built on site to assess the feasibility of a low-maintenance system to effect treatment via injection of a small volume of concentrated NaOH solution into the water. A solar panel connected to a battery supplied the system with electricity. Given the stability of the pH in the drainage no pH probe was needed. A final water treatment plant based on this pilot was built in 2017.



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