Question: A wet solid containing 70% water is mixed with recycled dry solid to reduce the water content to 50% before being admitted into the granulator.

A wet solid containing 70% water is mixed with recycled dry solid to reduce the water content to 50% before being admitted into the granulator. The solid leaving the granulator is fed to a drier where it is brought into contact with dry air initially containing 0.0025 kg water/kg BDA. In the drier, the air picks up moisture and leaves with a moisture content of 0.053 kg water/kg BDA. The solids leaving the drier contain 20% water. A portion of this solid output is recycled. If the granulator is supplied with 1000 kg/h of feed, determine: a) The amount of solid recycled, b) The amount of BDA supplied to the drier.

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