QUESTION 2B a) Nearly, all industrial membranes are fabricated from natural and synthetic polymers, compare and contrast

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Question 2b A Nearly All Industrial Membranes Are Fabricated From Natural And Synthetic Polymers Compare And Contrast 1 (247.92 KiB) Viewed 11 times

QUESTION 2B a) Nearly, all industrial membranes are fabricated from natural and synthetic polymers, compare and contrast the common membrane modules. [16 Marks] b) How does selectivity of separation change with increasing membrane thickness? [4 Marks] c) It is required to produce 20,000 m³ per day of potable water having a salt concentration not more than 300 ppm from sea water containing 3.3 % salt. An asymmetric cellulose acetate membrane (thickness of 0.8 micron) having a water permeability of 70 l/m².h.MPa and salt rejection of 98% is used. The feed-side pressure is 75 atm, that on the permeate side is 1atm. If 30% of the feed water permeates though the membrane, calculate the required membrane area. The polarisation modulus is 1.2 [10 Marks]