percent. The measured product flux is 6.5 gal/day-ft'.
(a) If the flaws are O.Ol-l'm pinholes in the dense layer, how many holes per square centimeter would be needed to account for the lower salt rejection?
(b) What is the corresponding fraction hole area in the dense layer?
(c) What would be the product flux if the pinholes were sealed without increasing the thickness of the membrane? 26.5. Show how the water flux and salt rejection would change with upstream pressure for a perfect cellulose acetate asymmetric membrane and a feed with an osmotic pressure of 20 atm. Use the diffusivity and solubility values for NaCI.