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The MSR 195I is a unique 2-trailer transportable thermal soil treatment unit designed to remediate soils contaminated with hazardous chlorinated solvents at a rate of up to 10 tons per hour. This indirectly heated batch type treatment system is a completely self contained closed-loop process that consists of 4 basic components: material processing chambers, heat exchangers, aqueous filtration system, and steam generator.
Thermal soil treatment consists of loading contaminated soil into one of the processing chambers, sealing the chamber and injecting the soil with high velocity steam through a series of injection tubes via the steam generator. The dual processing chamber arrangement allows one chamber to be charged with contaminated soil or for the removal of treated soil, while soil is being treated in the second chamber. The steam heats the soil which volatilizes, strips, and removes the contaminants from the soil. The steam, condensation and volatilized contaminants are continuously removed from the treatment chamber.
Contaminant laden vapor exiting the treatment chamber first passes through dual air-cooled heat exchangers where the majority of the vapor is condensed back to a liquid. The remaining vapor is then routed to water cooled condensers that further reduce the gas temperature in order to condense the remaining vapors. The liquid created from this gas stream is then combined with condensate formed within the treatment chamber and filtered through a series of bag filters to remove particulates. This filtered stream is then processed by a liquid phase granular activated carbon treatment system and recycled to the boiler for re-use creating a closed loop process. If desired, these liquids may alternately be disposed of at an approved facility prior to filtration and re-use in the system.
Following the treatment cycle, the soils are discharged from the treatment chamber and transferred to a staging area for confirmation sampling and analysis. Upon receiving confirmation the soil has met the cleanup criteria; soils are returned to the area of excavation and used as backfill.
The steam generator and treatment chambers are mounted on one 45’ long by 8’6” wide trailer, while the condensers, electrical generator and process pump are mounted on a second 10’ long by 6’ wide trailer. This system is easily accepted by the regulatory community and frequently used at dry cleaning and electrical manufacturing sites to remediate soils classified as hazardous waste.