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A Comparative Study Between Dried Anaerobic Digested Sludge and Dried Activated Sludge for the Removal of 4-Chlorophenol From Aqueous Solutions Publisher



Fanaie VR1 ; Karrabi M1 ; Amin MM2, 3 ; Shahnavaz B4 ; Fatehizadeh A3, 5
Authors
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Authors Affiliations
  1. 1. Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
  2. 2. Environment Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
  5. 5. Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Source: International Journal of Environmental Health Engineering Published:2016


Abstract

Aims: In this study, the adsorption capacity of dried anaerobic digested sludge (DADS) and dried activated sludge (DAS) for the removal of 4-chlorophenol (4-CP) from aqueous solutions was evaluated. Materials and Methods: Both anaerobic digested sludge and activated sludge were collected from a south municipal wastewater treatment plant in Isfahan. Batch biosorption experiments were carried out to investigate the effects of solution pH, contact time, biosorbent dosage and initial concentration of 4-CP. The residual concentration of 4-CP was analyzed by colorimetry method. Isotherms and kinetic equations were applied to study kinetic and equilibrium of adsorption. Results: Results indicated that, DAS have higher removal potential in comparison with DADS. The optimum pH was detected to be 3 for DADS and 4 for DAS. By increasing contact time and biosorbent dosage, removal efficiency of 4-CP increased for both biosorbents. Furthermore, a decreasing trend was observed when initial concentrations were increased. The equilibrium time for DAS was 2.5 h and for DADS was 4 h. The maximum adsorption capacity were found 1.67 mg/g for DAS and 0.93 mg/g for DADS. The 4-CP removal equilibrium isotherm was modeled by Freundlich equation. Kinetic studies suggested that pseudo-first-order model for DADS and second order for DAS were the best choices to describe biosorption behavior. Conclusion: According to the present study, DAS, have better efficiency for the removal of 4-CP in comparisons with DADS. © 2016 Medknow. All rights reserved.
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