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Technology Factsheet

Transportable Evaporator

Category: Waste Management > Waste Treatment > Size/Volume Reduction
Reference # : Model No :

Columbia Energy offers a nuclear-grade thin film evaporator (TFE) system to reduce liquid wastes prior to final treatment processing. By reducing water content in the liquid wastes, the storage capacity, the size of processing equipment and energy requirements are all reduced, thereby reducing capital costs and operating expenses overall. The material fed to the TFE is held as a thin film against the heated wall by means of the centrifugal force exerted by the internal rotor blade, which constantly renews the film as concentrated material is displaced towards the bottom. The thinness of the material exposed to the heated wall allows for rapid heat transfer, reducing holdup and residence time. Low material holdup within the unit reduces the quantity of shielding necessary to meet dose exposure constraints; for dilute or low-dose waste streams, self-shielding from the unit itself may be sufficient. The TFE also operates under a vacuum, which reduces the boiling point of water to approximately 120° - 140°F and enables up to 99% evaporation in a single pass through the unit.

Benefits

1)Reduced water content lowers capital costs and operating expenses by reducing the required storage capacity and size of processing equipment and energy requirements. 2)Vacuum operation reduces the boiling point of water to approximately 120 – 140°F; low temperature operation limits component carryover (e.g., organics, salts, etc.) into the vapor. 3)Low material holdup within the unit reduces the quantity of shielding necessary to meet dose exposure constraints; for dilute or low-dose waste streams, self-shielding from the unit itself may be sufficient.

Limitations

It has less surface uniformity and decreased step coverage.

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