Calculate the water and salt flux of a cellulose acetate membrane used to desalinate a 5%...

 

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Calculate the water and salt flux of a cellulose acetate membrane used to desalinate a 5% NaCl solution at an operating pressure difference of 100 bar with a salt rejection of nearly 100%. The flux of pure water through the membrane is 100 L m2h1 at a pressure difference of 100 bar. The osmotic pressure of 2% NaCl is 11.5 bar and the polarisation modules can be taken as unity. [5%] The same module is used to desalinate 4% of another salt at an osmotic pressure of 20 bar with a polarisation module of 3 and with a salt rejection of 0.99. Calculate the water and salt flux at an applied pressure difference of 75 bar. Also, calculate the mass transfer coefficient. [10%] Calculate the water and salt flux of a cellulose acetate membrane used to desalinate a 5% NaCl solution at an operating pressure difference of 100 bar with a salt rejection of nearly 100%. The flux of pure water through the membrane is 100 L m2h1 at a pressure difference of 100 bar. The osmotic pressure of 2% NaCl is 11.5 bar and the polarisation modules can be taken as unity. [5%] The same module is used to desalinate 4% of another salt at an osmotic pressure of 20 bar with a polarisation module of 3 and with a salt rejection of 0.99. Calculate the water and salt flux at an applied pressure difference of 75 bar. Also, calculate the mass transfer coefficient. [10%]