A flow-through leaching model for monolithic chemically stabilized/solidified hazardous waste

Chi Sun Poon, Zu Q. Chen, Onyx Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


Cement-based stabilization/solidification is a technology that is being used for the treatment of hazardous wastes before they are land disposed. It involves adding one or more solidification reagents to a waste stream and turning it into a monolithic solid. The resulting solidified waste products usually have improved handling characteristics, lower permeability and, hence, the leaching of contaminants from the waste can be reduced. Leaching occurs when a leachant contacts a waste and carries away contaminants from the waste. In this paper, the common leaching test methods for the evaluation of solidified/stabilized wastes and the leaching models that have been applied are reviewed. This paper also introduces a new model for the prediction of the long-term leaching behavior of cement-based stabilized/solidified hazardous wastes in a flow-through leaching test environment. The flow-through leaching environment, which is based on flexible wall permeameter test equipment, is different from other leaching test methods since the leaching occurs under a combination of diffusion and dispersion actions. The assumptions and limitations in applying the new model are highlighted.
Original languageEnglish
Pages (from-to)569-575
Number of pages7
JournalJournal of the Air and Waste Management Association
Issue number5
Publication statusPublished - 1 Jan 1999

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law


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