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Stabilisation and Solidification Processes
Stabilisation and solidification processes: General treatment principles. Stabilisation/solidification treatments aim to improve pollutant retention and give the material obtained a certain structural durability. Their objective is thus not to achieve a simple cladding of the contaminated material in an inert matrix, but a complex physical-chemical process to obtain stabilization and solidification of the pollutants. The processes most generally studied by INERTEC are hydraulic binder based processes, due to their ease of implementation (cold process, without gaseous emissions or liquid wastes) and their adaptability to variations in wastes.
From its experience and based on numerous laboratory studies, INERTEC has unique know-how to determine the most suitable formulation for each waste for all the problems encountered:
- Soluble salts (chlorides, sulphates...),
- Heavy metals (Lead, zinc, …) that are solubilisable, but also know as hydraulic capture retardants,
- Very toxic pollutants such as hexavalent chrome, arsenic, mercury, reactive aluminium metal, organic compounds,
- acidity…
From the chemical, mineralogical and microstructural characteristics of wastes determined in the laboratory, and from numerous research projects, applied studies have allowed the development of reagent combinations suited for all the problems encountered.
Stabilisation/solidification techniques are not only used for the treatment of wastes but also for other applications such as the treatment of contaminated sediments, industrial effluents, and for the rehabilitation of polluted sites.