Large volumes of industrial sludge and contaminated soils are treated in Europe. Complying with the Circular Economy concept, industrial sludge can be re-used in industry, construction and remediation or can be recovered as solid fuels.
Whatever the type and origin of environmental burdens are, all require treatment to control their adverse environmental impacts.
Challenges
European industry generates large volumes of different waste types. Some of them have been also stored at hazardous landfills or deposits over many decades. Industrial sludge, either from everyday operation or from old deposits or can be re-used in industry, construction and remediation or can be recovered as solid fuels. Whatever the type and origin of these materials are, all require treatment to control their adverse environmental impacts.
Solutions
Lime provides multiple effects in industrial sludge and contaminated soil treatment:
- Neutralising free acids in chemical waste and form solid precipitated salts
- Decreasing solubility of most contaminants in sludge or polluted soils (mainly heavy metals) thanks alkali pH and preventing them from leaching to environment
- Stabilising these materials thanks to pozzolanic reactions between lime and clay minerals in polluted soils or active silica /alumina in mineral sludge form impermeable matrix, contributing to contaminants leaching blockage
- Drying and solidifying the sludges thanks to exothermic hydration of CaO
Treatment with milk-of-lime can provide dust-free stabilisation at dry sites.
In special cases, customized lime-containing binders combine the effects above with increased cementitious reaction of hydraulic admixtures. This results in stable and durable final products wherever required.
PRODUCTS
Carmeuse offers the STABICALCO® product range for efficient treatment of industrial sludge and polluted soils in optimum quality, high performance and best process economy.
- STABICALCO® Q
- STABICALCO® QL
- STABICALCO® QD
- STABICALCO® QU
- STABICALCO® S
- STABICALCO® M
- STABICALCO® QB
- STABICALCO® SB