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Sodium hypochlorite (NAOCI, available at a strength of 14%) is used as a disinfectant at a water treatment plant that processes 25 mgd of water. When added to water, sodium hypochlorite undergoes the reactions shown below. The facility would like to achieve an initial hypochlorite dose of 4.5 mg/L OCI and will disinfect the water pH = 7.0. The disinfection chamber will have a L:W:D ratio of 60:1:1. Reaction #1: NaOCl → Na* + OCI- no pKa...reaction proceeds to completion Reaction #2: HOCI E> H* + OCl- pKa = 7.6 Based on Reaction #1, how much NaOCl (in gal/min) will be required to achieve the target dose? а. b. If the facility would like to maintain a 2-week supply of sodium hypochlorite, what storage volume is required (in 1,000 gallons)? What percentage of the chlorine added will exist as OCl at a pH = 7.0? d. The facility would like to have a detention time of 1.2 hours for the disinfection with a total of 5 passes (i.e., the reactor has a serpentine path with the length of each being 1/5 the total travel length). Calculate the reactor dimensions (in feet) and draw a plan- view schematic of the tank. с. process pass

Sodium hypochlorite (NAOCI, available at a strength of 14%) is used as a disinfectant at a water treatment plant that processes 25 mgd of water. When added to water, sodium hypochlorite undergoes the reactions shown below. The facility would like to achieve an initial hypochlorite dose of 4.5 mg/L OCI and will disinfect the water pH = 7.0. The disinfection chamber will have a L:W:D ratio of 60:1:1. Reaction #1: NaOCl → Na* + OCI- no pKa...reaction proceeds to completion Reaction #2: HOCI E> H* + OCl- pKa = 7.6 Based on Reaction #1, how much NaOCl (in gal/min) will be required to achieve the target dose? а. b. If the facility would like to maintain a 2-week supply of sodium hypochlorite, what storage volume is required (in 1,000 gallons)? What percentage of the chlorine added will exist as OCl at a pH = 7.0? d. The facility would like to have a detention time of 1.2 hours for the disinfection with a total of 5 passes (i.e., the reactor has a serpentine path with the length of each being 1/5 the total travel length). Calculate the reactor dimensions (in feet) and draw a plan- view schematic of the tank. с. process pass

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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Sodium hypochlorite (NAOCI, available at a strength of 14%) is used as a disinfectant at a water treatment plant that processes 25 mgd of water. When added to water, sodium hypochlorite undergoes the reactions shown below. The facility would like to achieve an initial hypochlorite dose of 4.5 mg/L OCI and will disinfect the water pH = 7.0. The disinfection chamber will have a L:W:D ratio of 60:1:1. Reaction #1: NAOCI → Na+ + OCI- no pKa...reaction proceeds to completion Reaction #2: HOCI E> H* + OCI- pKa = 7.6 Based on Reaction #1, how much NaOCI (in gal/min) will be required to achieve the target dose? а. b. If the facility would like to maintain a 2-week supply of sodium hypochlorite, what storage volume is required (in 1,000 gallons)? What percentage of the chlorine added will exist as OCI at a pH = 7.0? d. The facility would like to have a detention time of 1.2 hours for the disinfection process with a total of 5 passes (i.e., the reactor has a serpentine path with the length of each pass being 1/5 the total travel length). Calculate the reactor dimensions (in feet) and draw a plan- с. view schematic of the tank.
Transcribed Image Text:Sodium hypochlorite (NAOCI, available at a strength of 14%) is used as a disinfectant at a water treatment plant that processes 25 mgd of water. When added to water, sodium hypochlorite undergoes the reactions shown below. The facility would like to achieve an initial hypochlorite dose of 4.5 mg/L OCI and will disinfect the water pH = 7.0. The disinfection chamber will have a L:W:D ratio of 60:1:1. Reaction #1: NAOCI → Na+ + OCI- no pKa...reaction proceeds to completion Reaction #2: HOCI E> H* + OCI- pKa = 7.6 Based on Reaction #1, how much NaOCI (in gal/min) will be required to achieve the target dose? а. b. If the facility would like to maintain a 2-week supply of sodium hypochlorite, what storage volume is required (in 1,000 gallons)? What percentage of the chlorine added will exist as OCI at a pH = 7.0? d. The facility would like to have a detention time of 1.2 hours for the disinfection process with a total of 5 passes (i.e., the reactor has a serpentine path with the length of each pass being 1/5 the total travel length). Calculate the reactor dimensions (in feet) and draw a plan- с. view schematic of the tank.
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