A slurry containing 40% by mass solid is to be filtered on a rotary drum filter 2 m diameter and 2 m long which normally operates with 40% of its surface immersed in the slurry and under a pressure of 17 kN/m2 . A laboratory test on a sample of the slurry using a leaf filter of area 200 cm2 and covered with a similar cloth to that on the drum produced 296 cm3 of filtrate in the first 58 s and 138 cm3 in the next 58 s, when the leaf was under an absolute pressure of 17 kN/m2 . The bulk density of the dry cake was 1500 kg/m3 and the density of the filtrate was 1000 kg/m3 . The minimum thickness of cake which could be readily removed from the cloth was 5 mm. At what speed should the drum rotate for maximum throughput and what is this throughout in terms of the mass of the slurry fed to the unit per unit time?

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
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A slurry containing 40% by mass solid is to be filtered on a rotary drum filter 2 m diameter and 2 m long which normally operates with 40% of its surface immersed in the slurry and under a pressure of 17 kN/m2 . A laboratory test on a sample of the slurry using a leaf filter of area 200 cm2 and covered with a similar cloth to that on the drum produced 296 cm3 of filtrate in the first 58 s and 138 cm3 in the next 58 s, when the leaf was under an absolute pressure of 17 kN/m2 . The bulk density of the dry cake was 1500 kg/m3 and the density of the filtrate was 1000 kg/m3 . The minimum thickness of cake which could be readily removed from the cloth was 5 mm. At what speed should the drum rotate for maximum throughput and what is this throughout in terms of the mass of the slurry fed to the unit per unit time?
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