Remediation of Acid Rock Drainage by Regenerable Natural Clinoptilolite
2007
Li, L. Y. | Chen, M. | Grace, J. R. | Tazaki, K. | Shiraki, K. | Asada, R. | Watanabe, H.
Clinoptilolite is investigated as a possible regenerable sorbent for acid rock drainage based on its adsorption capacity for Zn, adsorption kinetics, effect of pH, and regeneration performance. Adsorption of Zn ions depends on the initial concentration and pH. Adsorption/Desorption of Zn reached 75% of capacity after 1–2 h. Desorption depended on pH, with an optimum range of 2.5 to 4.0. The rank of desorption effectiveness was EDTA > NaCl > NaNO₃ > NaOAc > NaHCO₃ > Na₂CO₃ > NaOH > Ca(OH)₂. For cyclic absorption/desorption, adsorption remained satisfactory for six to nine regenerations with EDTA and NaCl, respectively. The crystallinity and morphology of clinoptilolite remained intact following 10 regeneration cycles. Clinoptilolite appears to be promising for ARD leachate treatment, with significant potential advantages relative to current treatment systems.
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