The treatment of landfill leachate over Ni/Al2O3 by supercritical water oxidation

Civan F., Ozaltun D. H., KIPÇAK E., AKGÜN M.

JOURNAL OF SUPERCRITICAL FLUIDS, vol.100, pp.7-14, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 100
  • Publication Date: 2015
  • Doi Number: 10.1016/j.supflu.2015.02.018
  • Journal Name: JOURNAL OF SUPERCRITICAL FLUIDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.7-14
  • Keywords: Catalyst, Landfill leachate, Ni/Al2O3, Supercritical water oxidation, Treatment, WASTE-WATER, FENTON
  • Yıldız Technical University Affiliated: Yes

Abstract

This study presents the findings of our research regarding the catalytic treatment of landfill leachate over Ni/Al2O3 by supercritical water oxidation. Hydrogen peroxide was used as the oxygen source. The experiments were carried out at a constant pressure of 25 MPa, in the temperature range of 400-600 degrees C and the reaction time range of 30-150 s. The effects of temperature, reaction time, pressure, catalyst and oxidant use on the total organic carbon and total nitrogen contents of the liquid effluents were examined. As a result, it was seen that supercritical water oxidation was a very effective method for the treatment of landfill leachate. Treatment efficiencies up to 98.2% in terms of total organic carbon conversion were obtained. However nitrogen removal achieved about 57% in terms of total nitrogen conversion. (C) 2015 Elsevier B.V. All rights reserved.