Removal of Ni and Zn in contaminated neutral drainage by raw and modified wood ash

ABSTRACT

In the present study, wood ash was modified by alkaline fusion, prior to hydrothermal synthesis, for potential application in the treatment of mine drainage impacted water. With this objective, two types of wood ash (both raw and modified) were evaluated for the treatment of Ni and Zn in contaminated neutral drainage (CND). Batch adsorption experiments were initially conducted on synthetic CND, and then on two real CND, sampled on two active mine sites, contaminated by either Ni (3.7 mg/L) or Zn (9.1 mg/L). Leaching of Zn was observed during the kinetic tests for the raw wood ash, whereas its modification suppressed the leaching. The cation exchange capacity acquired by modification of the two samples of wood ash exceeded 300 meq/100 g (which is two to fourfold higher than those of the raw ash), while sorption capacity for Ni and Zn tripled relative to the raw material. The Langmuir model best described the sorption process for all materials, while potential mechanisms of metal removal include adsorption, precipitation and ion exchange, following pseudo second-order kinetics. Results also showed that within 2 h of contact of mine effluents with one modified wood ash, Ni and Zn concentrations decreased below the maximum authorized monthly mean concentration allowed by the Canadian law (0.5 mg/L), whereas the other modified wood ash allowed reaching the regulatory conformity after 2 h for Ni but 7 days for Zn (although 93% removed after 2 h). Nonetheless, the pH was raised (10.9–11.8) above the legally allowed limits (6–9.5). Based on these findings, modified wood ash could be considered as a promising option for the treatment of Ni and Zn in CND, but the pH correction of final effluent might be necessary.

KEYWORDS:

• Contaminated neutral drainage
• modified wood ash
• Ni and Zn removal
• sorption

Acknowledgments

The authors gratefully acknowledge the assistance of Dr. John W. Molson during the manuscript preparation.

Funding

This research was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the College of Abitibi-Témiscamingue, the industrial partners of the Centre Technologique des Résidus Industriels (CTRI)—Technological Center for Industrial Waste, Regénération, Iamgold Corporation, Hecla Québec, Mine Canadian Malartic, Technosub, and Organisme Bassin Versant du Témiscamingue, as well as of the Research Institute on Mines and Environment (RIME)—University of Québec in Abitibi-Temiscamingue (UQAT)—Polytechnique Montreal, including Agnico-Eagle, Mine Canadian Malartic, Iamgold, Raglan Mine—Glencore, and Rio Tinto.