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Iranian Journal of Environmental Health, Science and Engineering
Iranian Association of Environmental Health (IAEH)
ISSN: 1735-1979
Vol. 5, No. 4, 2008, pp. 277-282
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Bioline Code: se08044
Full paper language: English
Document type: Research Article
Document available free of charge
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Iranian Journal of Environmental Health, Science and Engineering, Vol. 5, No. 4, 2008, pp. 277-282
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Removal Of Hexavalent Chromium From Drinking Water By Granular Ferric Hydroxide
Asgari, A. R.; Vaezi, F.; Nasseri, S.; Dördelmann, O.; Mahvi, A. H. & Fard, E. Dehghani
Abstract
Removal of chromium can be accomplished by various methods but none of them is cost-effective in
meeting drinking water standards. For this study, granular ferric hydroxide was used as adsorbent for
removal of hexavalent chromium. Besides, the effects of changing contact time, pH and concentrations of
competitive anions were determined for different amounts of granular ferric hydroxide. It was found that
granular ferric hydroxide has a high capacity for adsorption of hexavalent chromium from water at pH?7
and in 90 min contact time. Maximum adsorption capacity was determined to be 0.788 mg Cr+6 /g granular
ferric hydroxide. Although relatively good adsorption of sulfate and chloride had been specified in this
study, the interfering effects of these two anions had not been detected in concentrations of 200 and 400
mg/L. The absorbability of hexavalent chromium by granular ferric hydroxide could be expressed by
Freundlich isotherm with R2 >0.968. However, the disadvantage was that the iron concentration in water
was increased by the granular ferric hydroxide. Nevertheless, granular ferric hydroxide is a promising
adsorbent for chromium removal, even in the presence of other interfering compounds, because granular
ferric hydroxide treatment can easily be accomplished and removal of excess iron is a simple practice for
conventional water treatment plants. Thus, this method could be regarded as a safe and convenient
solution to the problem of chromium-polluted water resources.
Keywords
Adsorption, hexavalent chromium, drinking water treatment, granular ferric hydroxide
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