Wastewater treatment by multi-stage batch adsorption and electrochemical regeneration

  • Fadhil M. Mohammed School of Chemical Engineering and Analytical Science, University of Manchester. The Mill, Oxford Road, Manchester M13 9PL, Current address: Ministry of Science and Technology, Baghdad, Iraq
  • Edward L. Roberts School of Chemical Engineering and Analytical Science, University of Manchester. The Mill, Oxford Road, Manchester M13 9PL
  • Andrew K. Campen Arvia Technology Ltd, Daresbury Innovation Centre, Keckwick Lane, Daresbury, Cheshire WA4 4FS
  • Nigel W. Brown Arvia Technology Ltd, Daresbury Innovation Centre, Keckwick Lane, Daresbury, Cheshire WA4 4FS

Abstract

The removal and destruction of a tri-phenyl methane dye, Acid Violet 17 (AV17), from aqueous solution by adsorption and electrochemical regeneration was studied using a graphite intercalation compound (GIC) adsorbent. It was demonstrated that the adsor­bent could be regenerated by anodic oxidation of the adsorbed dye in a simple electro­chemical cell. The GIC adsorbent recovered its initial adsorption capacity after 40 to 60 min of treatment at a current density of 10 mA cm-2, corresponding to a charge of 12 to 18 C g-1 of adsorbent. The charge passed is consistent with that expected for mine­rali­sation of the dye, suggesting that the dye was removed and destroyed with high charge efficiency. The energy cost of the regeneration was found to be around 120 J per g of adsorbent regenerated or 115 J per mg of the AV17 dye removed and destroyed. A model describing the process of wastewater treatment by multiple cycles of adsorption and electrochemical regeneration, based on adsorption isotherm data, has been deve­loped and validated. It was found that relatively modest improvements in the adsorption capacity of the adsorbent material could significantly improve the process performance.

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Published
10-11-2012
Section
Electrochemical Engineering