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In reverse osmosis membrane with a water permeability coefficient of Qw = 200 kg/m2.h.atm. When operated at 25 atm and 20oC with a feed containing 50 mM NaCl in dead- end mode in a very well-mixed system, it shows a rejection of 99%. You can assume an ideal solution of NaCl, and that the density of water is 1 kg/L.    What is the water flux Jw during this test?   Now you re-run the system, but the stirrer malfunctions and stirs much more slowly. Because of the resultant concentration polarization, the concentration of NaCl on the surface of the membrane surface in the feed is 6 times the bulk concentration. Calculate the water flux you would observe under these conditions.

In reverse osmosis membrane with a water permeability coefficient of Qw = 200 kg/m2.h.atm. When operated at 25 atm and 20oC with a feed containing 50 mM NaCl in dead- end mode in a very well-mixed system, it shows a rejection of 99%. You can assume an ideal solution of NaCl, and that the density of water is 1 kg/L.    What is the water flux Jw during this test?   Now you re-run the system, but the stirrer malfunctions and stirs much more slowly. Because of the resultant concentration polarization, the concentration of NaCl on the surface of the membrane surface in the feed is 6 times the bulk concentration. Calculate the water flux you would observe under these conditions.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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In reverse osmosis membrane with a water permeability coefficient of Qw = 200 kg/m2.h.atm. When operated at 25 atm and 20oC with a feed containing 50 mM NaCl in dead- end mode in a very well-mixed system, it shows a rejection of 99%. You can assume an ideal solution of NaCl, and that the density of water is 1 kg/L.

 

 What is the water flux Jw during this test?

 

Now you re-run the system, but the stirrer malfunctions and stirs much more slowly. Because of the resultant concentration polarization, the concentration of NaCl on the surface of the membrane surface in the feed is 6 times the bulk concentration. Calculate the water flux you would observe under these conditions.  

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