Removal and Stabilization of Chromium Ions from Industrial Effluents
Pakistan Insitute of Nuclear Science and Technology, Health Physics Division, P.O. Nilore, Islamabad (Pakistan) E-mail: ghaffargreat@yahoo.com
Pages: 669-675
Abstract
Laboratory experiments were designed to investigate the removal of chromium ions from industrial effluent by stabilizing in silica sand, acting as adsorbents, to prevent leaching. Removal of chromium (III) ions from industrial effluents using silica sand (originated from the river of Ravi) was studied to optimize the physicochemical conditions for maximal removal. The range of pH and temperature was adjusted to achieve maximal removal of metal ions. The initial and final concentration of chromium was measured by atomic absorption spectroscopy. The residual concentration of chromium in waste water after treatment was less than 1.0mg/1 which is the value recommended by National Environment Quality Standards (NEQS). Maximal removal (94-96%) of chromium is achieved with pH 10 and at a temperature of 28oC. Under optimized conditions within temperature range of 301-315K the values of D
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