Question: A membrane filtration unit is operating with 66.3 m 2 of membrane and processes 142 L/min feed of wastewater. The permeate flow is 78.5 L/min.

A membrane filtration unit is operating with 66.3 m² of membrane and processes 142 L/min feed of wastewater.

The permeate flow is 78.5 L/min.

The filter removes suspended solids from a waste stream such that the concentration in the permeate is 20.4 mg/L compared to 3,908 mg/L in the retentate.

Determine the flow ofretentate (in L/min). Report answer to one decimal place.

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