Informal report PFF

# Informal report PFF - Plate and Frame Filtration By David...

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Plate and Frame Filtration By David Taylor ChE 325 3/13/08

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To: Bingqi Zhang, Supervisor From: David Taylor Date: March 13, 2008 Re: Plate and Frame Filtration experiment We experimented with the plate and frame filtration apparatus to determine the effect different pressure drops had on the resistances of the filter medium (canvas) and the cake.
We expected both the cake and canvas to experience higher resistances with higher pressure drops. This occurs because at higher pressure drops, more particles are forced into the filter medium and the cake becomes more compressed. Our data confirms what was expected. From the data, we were able to plot dt/dM versus M. This plot can be found in Appendix C. Most of the results came from using equation (10) from Appendix A: From the slopes and intercepts of the plot the following values for resistances at different pressures were calculated, using equations from Appendix A: Our experimental procedure consisted of using a basic laboratory plate and frame filter press at pressure drops of 20, 30, 40, and 50 psig. For each pressure, the apparatus was run until 10-15 kg of liquid was collected in the tank below the computer. The cakes were then collected and dried in a pre-weighed beaker. 20 psig 30 psig 40 psig 50 psig α 1.18x10 1 0 1.67x10 1 0 1.85 x10 10 1.47 x10 10 K cl 9.73 x10 6 1.61 x10 7 1.25x10 7 1.57x10 7 ) ( ) 1 )( ( 2 P A K n S P A SM dM dt cl - + - - = ρ μ α

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After plotting the data, the constants for cloth and cake resistivity were calculated by using equation (10) in Appendix A. The sample calculations can be found in Appendix C. The resistivity also follows the empirical power law formula for compressibility, or equation (11) in Appendix A. With higher pressure drop, we also found that the water content in the cakes went down, resulting in higher solid content. Enclosed are Appendices A-E:
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Informal report PFF - Plate and Frame Filtration By David...

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