Long-Term Leaching Scenarios for Cement-Based Waste Forms

Cement-based waste forms (solidified wastes) are used for the long-term land disposal of industrial hazardous wastes. A cement-based waste form can be prepared by mixing a hydraulic cement and, if needed, a bulking agent with an aqueous waste to cause it to solidify. This article presents eight long...

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Bibliographic Details
Published in:Waste management & research 1987-01, Vol.5 (1), p.55-66
Main Authors: Côté, Pierre L., Bridle, Trevor R.
Format: Article
Language:English
Subjects:
Cements
Computational fluid dynamics
Contaminants
Fluid flow
Groundwater
Leaching
Mathematical models
Wastes
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Summary:Cement-based waste forms (solidified wastes) are used for the long-term land disposal of industrial hazardous wastes. A cement-based waste form can be prepared by mixing a hydraulic cement and, if needed, a bulking agent with an aqueous waste to cause it to solidify. This article presents eight long-term leaching scenarios based on various properties of waste forms and contaminants as well as different hydraulic regimes and characteristics of groundwater. Each scenario takes the form of a simplified mathematical model used to predict leaching rates for periods of up to 100 years. The analysis demonstrates the importance of chemically fixing the contaminants in the matrix and illustrates the advantages of avoiding situations where groundwater flows through the waste. In situations where advective transport is negligible, leaching rates are limited by pore diffusion and tend to decrease with time.
ISSN:0734-242X
1096-3669
DOI:10.1177/0734242X8700500105