Indirect Thermal Desorption (TDU) applies heat to the contaminated soil while isolating the flame from the material. The contaminant vapor is isolated, so it can be recovered, condensed, and recycled, eliminating long-term liability.
This TDU treatment is different to Brightway Drilling Waste Management System, which is mainly composed of vertical cuttting dryer and VFD decanter centrifuge by the physical principal of centrifugal force as below picture.
Here is the example of Brandt TDU. The cuttings are heated up indirectly in a large diameter, rotating dryer, with the contaminants being vaporized, as the cuttings move forward through the dryer to discharge.
The vapors are pulled from the dryer and filtered, to remove the dust particulate.
Vapors are then condensed to a liquid phase and are processed through an oil/water separation system.
Recovered water is used to rehydrate the cleaned cuttings while the recovered oil is used in new mud or fuel in the burners.
Stainless steel construction allows for the high temperatures necessary for processing drilled cuttings. Variable speed dryer rotation and positive sealing system to prevent discharge of dust and vapor.
A high temperature separator filters vapors, removing dust, leaving recovered oil clean.
Vapor Cooling System – Stainless shell & tube water-cooled heat exchanger, with closed loop cooling tower.
Oil/water Separation System – First pass through slant bed oil/water separator, then through a coalescer.
Soil Conditioner – dual shafted pug mill, with recycled water spray system to rehydrate and cool the cleaned cuttings.
Post Treatment Oil Uses
Use as base oil for drilling fluids
Send to pipeline for re-use
Use in burners to fuel the thermal process
Fuel for other industrial processes
Diesel engine fuel
Oil/water separators (heater treater)
The Brandt THOR™ system uses the Best Available Control Technology (BACT) in the “state of the art” patented THOR process.
With the addition of the thermal oxidizer equipment on the new THOR system, stack emissions are below US EPA guidelines for this process and will beat our clients’ most stringent requirements.
The US EPA has designated this technology as the Best Demonstrated Available Technology (BDAT) for remediation of hydrocarbon contaminated soils.
This drilling waste treatment of TDU is complicated than our drilling waste management, while our sludge drying system can be completed further as the Zero discharge system by making the dried waste to be the solids bricks.