Mobile Thermal Desorption Plant
The Thermal Desorption Process
DEC’s mobile thermal desorption plant is designed and constructed to effectively purify soils contaminated with coal tar, polycyclic aromatic hydrocarbons, cyanides, mineral oils, chlorinated solvents, sulphur and mercury. The system is designed to be both versatile, highly portable and provisions are made for maximum heat recovery.
The system is based on the concept of low temperature thermal desorption which is the process of contaminant removal by transferring contaminants from one phase to another. The system is operated by targeting an operational temperature that is slightly greater than the highest boiling point of the compounds under treatment. As the soil is heated to this point the compounds vaporise and become part of the gas stream. The gases are then removed by negative pressure and routed into the extensive gas treatment.
The soil treatment system consists of a material feed/preparation unit, rotary drum with processed material cooling and discharge system (soil treatment) and a process gas treatment system. The capacity of the plant is 15-30 tons/hr.
Mobile Soil Washing
Cost savings through the use of Mobile Soil Washing Installations
Soil washing is an effective technique to remediate contaminated soil, removing a large number of organic and inorganic contaminants. DEC has designed, developed and built a number of mobile soil washing and recycling systems that can be employed worldwide for the on-site treatment and recycling of contaminated soil.
These mobile installations avoid unnecessary soil transport and disposal costs for the client. DEC’s mobile soil washing plant incorporates the most up-to-date soil washing technologies and has a capacity of 30-45 tons/hr.
The Soil Washing Process
Soil washing is a process whereby contaminants adhere to the fine-fraction of the soil, such as organic matter and clay/silt.
The principle of the method utilizes the difference in grain sizes and density of the materials and separates the different fractions by means of screens, hydro-cyclones and upstream classification.
Pollutants in the input material are separated and transferred from the sand and gravel fractions to a filter-cake residue; thereby minimising the volume of the contaminated soil needing to be disposed at a landfill site.
In the design and execution of complex projects, DEC combines in-situ remediation techniques with other disciplines, such as immobilisation of contaminated soils, treatment of sediments, containment of sites, hydraulic engineering, excavation and ex-situ treatment of soils, providing a full, integrated solution for our clients.
DEC's Mobile Plants
Mobile Soil Treatment Plants:
Mobile soil washing plant 'SWI I'
Mobile soil washing plant 'SWI II'
Mobile soil washing plant 'SWI III'
Mobile soil washing plant 'SWI IV'
Mobile Immobilisation Plant