Reverse osmosis unit is to be used to decrease NaCl content in sea water from 35 kg.m-3down to 1.5..

Reverse osmosis unit is to be used to decrease NaCl content in sea water from 35 kg.m-3down to 1.5 kg.m-3. Capacity of the unit should be 1000 m3 of desalinized water per day.For the unit, membrane modules of area 3 m2, with a membrane which has a volumetricrejection factor 0.99 and permeate flux 54.2 L.m-2.h-1 at 16°C, 15bar pressure differenceand NaCl concentration in retentate 1.5 kg.m-3. Desalinization will be carried at pressuredifference 200 bar. The osmotic pressure of NaCl is linear function of concentration being0.372 MPa for solution containing 5 kg.m-3.Determine: the number of membrane modules to be used.the volumetric flow rate of the feed and relative fraction of permeate.the concentration of NaCl in the retentate