Solidification and Stabilisation (S/S) treatment of waste involves mixing cement into contaminated media or waste to immobilise contaminants within the treated material. The waste become more solid thereby lowering the solubility of toxic contaminants in the waste. In some cases, such as in stabilisation, the toxicity of the hazardous constituent(s) is lowered.
Stabilisation and Solidification has frequently been used for the treatment and immobilisation of soils and sludges containing one or more contaminants. Although there is no standard method of S/S application, selecting an appropriate binder is crucial to a successful treatment program. A well structured testing program guided by an understanding of the mechanisms involved in S/S system will reduce uncertainty in the selection process.