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Environmental Science and Pollution Research

, Volume 22, Issue 10, pp 7882–7896 | Cite as

Use of EDTA in modified kinetic testing for contaminated drainage prediction from waste rocks: case of the Lac Tio mine

  • Benoît PlanteEmail author
  • Mostafa Benzaazoua
  • Bruno Bussière
  • El-Hadji-Babacar Kandji
  • Aurélie Chopard
  • Hassan Bouzahzah
Research Article

Abstract

The tools developed for acid mine drainage (AMD) prediction were proven unsuccessful to predict the geochemical behavior of mine waste rocks having a significant chemical sorption capacity, which delays the onset of contaminated neutral drainage (CND). The present work was performed in order to test a new approach of water quality prediction, by using a chelating agent solution (0.03 M EDTA, or ethylenediaminetetraacetic acid) in kinetic testing used for the prediction of the geochemical behavior of geologic material. The hypothesis underlying the proposed approach is that the EDTA solution should chelate the metals as soon as they are released by sulfide oxidation, inhibiting their sorption or secondary precipitation, and therefore reproduce a worst-case scenario where very low metal attenuation mechanisms are present in the drainage waters. Fresh and weathered waste rocks from the Lac Tio mine (Rio tinto, Iron and Titanium), which are known to generate Ni-CND at the field scale, were submitted to small-scale humidity cells in control tests (using deionized water) and using an EDTA solution. Results show that EDTA effectively prevents the metals to be sorbed or to precipitate as secondary minerals, therefore enabling to bypass the delay associated with metal sorption in the prediction of water quality from these materials. This work shows that the use of a chelating agent solution is a promising novel approach of water quality prediction and provides general guidelines to be used in further studies, which will help both practitioners and regulators to plan more efficient management and disposal strategies of mine wastes.

Keywords

Contaminated mine drainage EDTA Kinetic testing Prediction of the geochemical behavior of mine wastes Waste rock Nickel Contaminated neutral drainage (CND) 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Benoît Plante
    • 1
    Email author
  • Mostafa Benzaazoua
    • 1
  • Bruno Bussière
    • 1
  • El-Hadji-Babacar Kandji
    • 1
  • Aurélie Chopard
    • 1
  • Hassan Bouzahzah
    • 1
  1. 1.Research Institute in Mining and the Environment (RIME)UQAT (Université du Québec en Abitibi-Témiscamingue)Rouyn-NorandaCanada

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