Degradation of recalcitrant compounds from stabilized landfill leachate using a combination of ozone-GAC adsorption treatment

Tonni Agustiono Kurniawan, Wai Hung Lo, Yuk Sing Gilbert Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

155 Citations (Scopus)


Laboratory experiments were undertaken to investigate the treatment performances of ozonation alone and/or its combination with granular activated carbon (GAC) adsorption for raw leachate from the NENT landfill (in Hong Kong). To improve its removal of recalcitrant contaminants from the leachate, the surface of GAC was oxidized with ozone prior to treatment. With respect to ozone dose and pH, the removal of COD and/or NH3-N from ozonation alone and combined ozone-GAC adsorption were evaluated and compared to those of other physico-chemical treatments in some reported studies. The removal mechanism of recalcitrant compounds by ozone-GAC adsorption treatment was presented. Among the various treatments studied, the combination of ozone-GAC adsorption using ozone-modified GAC had the highest removal for COD (86%) and/or NH3-N (92%) compared to ozonation alone (COD: 35%; NH3-N: 50%) at the same initial COD and/or NH3-N concentrations of 8000 and 2620 mg/L, respectively. Although the integrated treatment was more effective than ozonation alone for treating stabilized leachate, the results suggested that it could not generate treated effluent that complied with the COD limit of lower than 200 mg/L and the NH3-N discharge standard of less than 5 mg/L. Therefore, further biological treatments to complement the degradation of the leachate are still required to meet the environmental legislation.
Original languageEnglish
Pages (from-to)443-455
Number of pages13
JournalJournal of Hazardous Materials
Issue number1
Publication statusPublished - 1 Sep 2006


  • Advanced oxidation process (AOP)
  • Landfill leachate management
  • Municipal solid waste
  • Non-biodegradable compounds
  • Physico-chemical treatments

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis


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