Water that has a salt concentration of 12500 mg salt/Liter water is fed into a unit (U1) that can reduce the concentration of the salt. The outputs of this unit are a concentrated stream, and a diluted stream with salt concentration of 100 mg/L water. In order to obtain a water with a salt concentration of 500 mg/L water, a by-pass stream is used, where the by-pass stream is mixed with the diluted stream output of the unit (U1). If the fresh feed has a volumetric flow rate of 100L/min, and the concentrated stream accounts to 75% of the fresh feed.

Sketch fully detailed flow-chart of the process
Determine the NDF of at least three control volumes.
Calculate the concentration of the salt in the concentrated stream
Calculate the mass flowrate of water that has a salt concentration of 500 mg/L water
If the mass flowrate of water that has a salt concentration of 500 mg/L water is needed to be 340 g/min, calculate the mass flowrate of the fresh feed.