Journal
APPLIED CLAY SCIENCE
Volume 50, Issue 1, Pages 158-163Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2010.07.005
Keywords
Acid rock drainage; Adsorption; Zinc; Natural clinoptilolite; Slurry bubble column
Funding
- Natural Sciences and Engineering Research Counsil of Canada
- British Columbia Ministry of Transportation and Infrastructure
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Zinc uptake by adsorption from zinc-spiked acid rock drainage (ARD) on natural clinoptilolite was investigated in a slurry bubble column. The effects of contact time, adsorbent particle size, initial aqueous zinc concentration, adsorbent dosage and initial solution pH on zinc immobilization were examined. Langmuir and Freundlich adsorption isotherm equations were fitted to the experimental data. Finer clinoptilolite particles adsorbed more zinc, probably due to more accessible surface area. Zinc adsorption improved as pH increased from 2 to 5, probably due to competition of H+ at low pH. A slurry loading of 200 g clinoptilolite per kilogram ARD and an initial aqueous pH of 4 appear to be suitable conditions for removing zinc from ARD. While the aqueous concentration of zinc in ARD was reduced significantly in a single run, 8 cycles of adsorption in series were needed to reduce the zinc concentration to the regulated level. (C) 2010 Elsevier B.V. All rights reserved.
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