525D Thermal Desorption Unit

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PROCESS DESCRIPTION

The MSR 525D is a medium capacity, direct-fired thermal desorption unit comprised of three major components; a rotary desorber for soil treatment, a baghouse for dust collection, and a thermal oxidizer to manage organic vapors. This equipment is totally portable and constructed on two road ready trailers. The system is utilized primarily for the treatment of soils contaminated with Petroleum Hydrocarbons, Volatile/Semi Volatile Organic Compounds. Optional control devices such as acid gas scrubbers or absorbers are added for projects involving chlorinated compounds. The 525D is self-contained and is connected to land power or portable generator. The generator and burners are fired on Natural Gas, propane or No. 2 diesel fuel. This system is typically set-up and operational within 2 – days of mobilization to a project site.

The soil treatment process is simple and begins with loading contaminated materials into a feed bin at the rear of the desorption trailer. A controlled material feed-rate is achieved with a variable speed conveyor that transfers the material directly from the feed bin onto an in-motion weigh conveyor belt that deposits the material into the rotary desorber. Once in the desorber, the soil is conveyed within the rotating chamber by gravity and specially designed flighting. A burner positioned at the discharge end of the desorber provides the heat that is absorbed by the soil causing the temperature of the volatile compounds to rise and volatilize into the air stream and be carried out of the chamber. Material processing temperatures are maintained based upon contaminant type, concentration and clean up objective.

Gasses containing water, organic vapors, and particulate matter exit the desorber and are directed to the baghouse where particulates are removed. The resulting air flow, now only carrying organic vapors, is ducted to the oxidizer and heated to between 1,400°F and 1,800°F at which point the organics are converted to carbon dioxide (CO2), and water vapor (H2O).

The processed soils exit the kiln at temperatures of 400° F to 900° F and are rehydrated allowing for proper compaction during backfilling and to suppress fugitive dust emissions. Operation of the unit is performed from the main control room, where the operator is able to start-up, operate, monitor and shut-down the unit. Process variables are displayed here, providing current information regarding all system parameters that enable the operator to accurately control unit operations. Following remediation, this equipment is easily decontaminated, disassembled and prepared for demobilization within 2 – days’ time.