Land Clean opens up thermal desorbtion treatment plant
Land Clean Ltd, a specialist in land remediation, is adding thermal treatment to its services for dealing with contaminated soils.
Thermal desorbtion, the company explains, is simply the application of heat to contaminated soils. It is an ex-situ process, heating soils to between 300 and 550°C. The treatment takes place in a specialised portable plant that heats the soil indirectly in a rotating drum. The clean soil can be reused, while the separated hydrocarbon contaminants are recovered. There is no incineration or oxidation in the process.
Land Clean states that it will have a plant in the UK imminently and it is fully licensed under the Environment Agency Mobile Plant Licensing system.Features of the method
The company outlines the features of this method of treatment as:
Land Clean Ltd has undertaken treatability trials for the following soil types:
1 Sludge from gasification plant: 17% PAH & TPH loading, 40% moisture content, 100% silt and clay - treatable.
2 Gas works waste: liquid coal tars present up to 5% loading, moisture content up to 30% - treatable.
3 Other trials undertaken elsewhere have shown that oil refining sludges and oil exploration drilling muds are readily treatable.
4 Furthermore, pesticides and chlorinated solvents can also be handled due to the acid gas removal capability.Design considerations
The company says that the following issues should be considered when designing for this treatment system:
Land Clean can also cite examples of a range of land remediation case studies, ranging for the on-site bioremediation of soil in a timber treatment yard where the primary contaminant was creosote, involving long term environmental monitoring of the site, to the excavation and disposal to licensed facilities of impacted soils at a scrap yard. This involved the excavation, over drumming and disposal of 30 buried chemical drums.
The company's wide range of remediation works has also taken in foundry, gas works and used oil processing plant contracts.