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Twenty-seven pounds of chlorine gas is used for treating 750,000 gallons of water. The chlorine demand for water is measured to be 2.6 mg/L. What is the residual chlorine concentration in the treated water?

Twenty-seven pounds of chlorine gas is used for treating 750,000 gallons of water. The chlorine demand for water is measured to be 2.6 mg/L. What is the residual chlorine concentration in the treated water?

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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SAMPLE PROBLEM 5 Twenty-seven pounds of chlorine gas is used for treating 750,000 gallons of water. The chlorine demand for water is measured to be 2.6 mg/L. What is the residual chlorine concentration in the treated water? Given: Clused = 27 Ibs V water = 750, 000 gal Cl'demand = 2.6 mg/L Req'd: Clresidual Sol'n: Recall that residual chlorine is an indicator of the absence of pathogens in the water. Meaning, total chlorine being used includes both the demand and the residual. Therefore, we can make an equation that says Clused = Cl'demand + Clresidual 27 lbs 1kg 2.2 lb (1000g)(1000mg 1kg 1g (3.7854 L gal mg = [2.6 + Clrestaual] L 750,000 gal Clresidual = 1.7228 mg/L Recompute Sample Problem 5 if the 26 Ibs of chlorine gas were used and the demand is 3.5 mg/L.
Transcribed Image Text:SAMPLE PROBLEM 5 Twenty-seven pounds of chlorine gas is used for treating 750,000 gallons of water. The chlorine demand for water is measured to be 2.6 mg/L. What is the residual chlorine concentration in the treated water? Given: Clused = 27 Ibs V water = 750, 000 gal Cl'demand = 2.6 mg/L Req'd: Clresidual Sol'n: Recall that residual chlorine is an indicator of the absence of pathogens in the water. Meaning, total chlorine being used includes both the demand and the residual. Therefore, we can make an equation that says Clused = Cl'demand + Clresidual 27 lbs 1kg 2.2 lb (1000g)(1000mg 1kg 1g (3.7854 L gal mg = [2.6 + Clrestaual] L 750,000 gal Clresidual = 1.7228 mg/L Recompute Sample Problem 5 if the 26 Ibs of chlorine gas were used and the demand is 3.5 mg/L.
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