Mass Transfer
Radioactive nuclear waste is treated in

Pulsed column extractor
Mixer-settler extractor
Bollman extractor
Rotating-disc contactor

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Mass Transfer
Flights in a rotary dryer are provided to

None of these
Reduce the residence time of solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Increase the residence time of the solid

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