Answered: Water is to be purified by passage…

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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Water is to be purified by passage through a stationary L = 0.5 m long stationary packed bed of activated charcoal beads. The beads may be assumed to be solid spheres, so that no flow passes into the particles themselves. These beads are of uniform diameter d_p = 2 mm, filling 65 % of the bed space, forming a bed of 35% porosity.

The water passes from one tank, maintained at a constant level by a controller, through a tube of diameter d >> d_p, containing a packed section with the beads and then exits to atmospheric pressure and falls into a second tank. The packed section is held fixed by porous end plates of negligible flow resistance. It is desired that the water spend an average of 50 seconds in the packed column. Any flow resistance besides that of the packed bed may be assumed to be negligible.

What should be the value of Z in the sketch?

What should be the value of the pipe diameter, d, if 1 m³ of water is to be processed per day (i.e. every 24 hours)?

Water is to be purified by passage through a stationary L = 0.5 m long
stationary packed bed of activated charcoal beads. The beads may be
assumed to be solid spheres, so that no flow passes into the particles
themselves. These beads are of uniform diameter de = 2 mm, filling 65 % of
the bed space, forming a bed of 35% porosity.
The water passes from one tank, maintained at a constant level by a
controller, through a tube of diameter d>> da, containing a packed section
with the beads and then exits to atmospheric pressure and falls into a second
tank. The packed section is held fixed by porous end plates of negligible flow
resistance. It is desired that the water spend an average of 50 seconds in the
packed column. Any flow resistance besides that of the packed bed may be
assumed to be negligible.
a) What should be the value of Z in the sketch? e
What should be the value of the pipe diameter, d, if 1 m3 of water is to be
processed per day (i.e. every 24 hours)?L
Upper surface
of water
Z = ?
g
L = 0.5 m
Falls into second tank

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