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Potable water containing not more than 500 ppm dissolved salt (i.e. 0.05 wt% salt) is made by desalinization through reverse osmosis (RO) of sea water which contains 3.1 wt% salt. Fresh sea water is admitted at a rate of 1000 kg/h. Potable water is withdrawn from the RO unit as product. A fraction of the brine that leaves the RO unit and containing 5.25 wt% salt is recycled. The concentration of salt in the stream entering the RO unit after mixing the recycle stream with fresh sea water is 4.0 wt%. Determine the following: The rate at which brine is removed from the process, kg/h (a) (b) The rate at which potable water is produced, kg/h The fraction of the brine leaving the RO unit that is recycled. (c)

Potable water containing not more than 500 ppm dissolved salt (i.e. 0.05 wt% salt) is made by desalinization through reverse osmosis (RO) of sea water which contains 3.1 wt% salt. Fresh sea water is admitted at a rate of 1000 kg/h. Potable water is withdrawn from the RO unit as product. A fraction of the brine that leaves the RO unit and containing 5.25 wt% salt is recycled. The concentration of salt in the stream entering the RO unit after mixing the recycle stream with fresh sea water is 4.0 wt%. Determine the following: The rate at which brine is removed from the process, kg/h (a) (b) The rate at which potable water is produced, kg/h The fraction of the brine leaving the RO unit that is recycled. (c)

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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Potable water containing not more than 500 ppm dissolved salt (i.e. 0.05 wt% salt) is made by desalinization through reverse osmosis (RO) of sea water which contains 3.1 wt% salt. Fresh sea water is admitted at a rate of 1000 kg/h. Potable water is withdrawn from the RO unit as product. A fraction of the brine that leaves the RO unit and containing 5.25 wt% salt is recycled. The concentration of salt in the stream entering the RO unit after mixing the recycle stream with fresh sea water is 4.0 wt%. Determine the following: The rate at which brine is removed from the process, kg/h (a) (b) The rate at which potable water is produced, kg/h (c) The fraction of the brine leaving the RO unit that is recycled.
Transcribed Image Text:Potable water containing not more than 500 ppm dissolved salt (i.e. 0.05 wt% salt) is made by desalinization through reverse osmosis (RO) of sea water which contains 3.1 wt% salt. Fresh sea water is admitted at a rate of 1000 kg/h. Potable water is withdrawn from the RO unit as product. A fraction of the brine that leaves the RO unit and containing 5.25 wt% salt is recycled. The concentration of salt in the stream entering the RO unit after mixing the recycle stream with fresh sea water is 4.0 wt%. Determine the following: The rate at which brine is removed from the process, kg/h (a) (b) The rate at which potable water is produced, kg/h (c) The fraction of the brine leaving the RO unit that is recycled.
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