Question: #4[25pts] It is desired to filter solid particles from water through a supported polypropylene membrane. The membrane is 0.0025cm thick and has a porosity of

#4[25pts] It is desired to filter solid particles from water through a supported polypropylene membrane. The membrane is 0.0025cm thick and has a porosity of 35%. The membrane pores can be considered straight cylinders of uniform diameter equal to 0.2m. The pressure on the permeate side of the membrane is 220kPa. It is desired to achieve a volumetric flux of 190m3/m2 per day through the membrane. The pressure drop through the membrane support can be assumed negligible. Assume a viscosity of 0.001 Pas. a) Draw a flow diagram for the process. [7 pts] b) Estimate the required pressure (in kPa ) on the feed side of the membrane needed to achieve the desired volumetric flux. [7 pts] c) Explain why over time the flow rate (flux) through the filter would decrease. [7 pts]

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