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Isotherms and Kinetics Studies of Biosorption Nickel (Ii) and Chromium (Vi) From Aqueous Solution by Dried Activated Sludge Publisher



Malakootian M1 ; Ghadiri SK2 ; Yousefi N2 ; Fatehizadeh A3
Authors
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Authors Affiliations
  1. 1. Environmental Health Research Center and Department of Environmental Health Engineering, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran

Source: International Journal of Environmental Health Engineering Published:2012


Abstract

Aims: The aim of this study is the recovery of municipal refuse and using it as a biosorbent for Nickel (II) and Chromium (VI) (Ni2+and Cr6+)removal from aqueous solutions. Materials and Methods: Activated sludge was obtained from the wastewater treatment plant in a dairy industry. All experiments were performed in the batch system and effective parameters such as the pH, adsorbent dosage, and the initial concentration and contact time of Ni2+and Cr6+were investigated. The adsorption isotherms and kinetics were evaluated to describe the metal uptake and dynamic reactions. Results: The results of this study showed that with an increasing adsorbent dose and contact time, Ni2+and Cr6+removal efficiency increased. The maximum adsorption of Ni2+and Cr6+was obtained in pH 6 and 2, respectively. Meanwhile, with increasing Ni2+and Cr6+concentration, the removal efficiency decreased. The results best fitted the Langmuir isotherm and the maximum absorption capacity of Ni2+and Cr6+onto dry activated sludge (DAS) were 2.17 and 2.23 mg/g, respectively. Analysis of the adsorption kinetics showed that the intraparticle diffusion kinetic had been good and presented Ni2+and Cr6+uptake onto DAS, and the intraparticle diffusion rate constant of Ni2+and Cr6+ were 0.044 and 0.042 (mg/g min0.5), respectively. Conclusions: According to the results, dry activated sludge is suggested as a low cost and available adsorbent for removing Ni2+and Cr6+from aqueous solutions. © 2012 Medknow. All Rights Reserved.
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