Transfer mechanisms of contaminants in cement-based stabilized/solidified wastes

X. C. Qiao, Chi Sun Poon, C. R. Cheeseman

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


Stabilization/solidification (S/S) processes are routinely used for the final treatment of hazardous wastes prior to land disposal. Cement-based binder systems with partial replacement of cement by pulverized fuel ash (PFA) are common. In order to predict the long-term leaching characteristics of S/S wastes, it is important to understand the leaching mechanism. This paper presents experimental results from a study that has investigated the leaching behaviour of contaminants from cement-based S/S waste forms. A novel radial leach test (RLT) has been used to study the migration of heavy metals. The results show that contaminants migrate from the inner core of the S/S waste during leaching to the sample surface and accumulate near the edge of the S/S waste. The degree of accumulation is related to the contaminant species and the Ca(OH)2content.
Original languageEnglish
Pages (from-to)290-296
Number of pages7
JournalJournal of Hazardous Materials
Issue number1-3
Publication statusPublished - 28 Feb 2006


  • Chemical stabilization/solidification
  • Hazardous waste
  • Leaching

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering


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