Homework Help is Here – Start Your Trial Now!
Engineering
Chemical Engineering
1. Based on the following water composition, determine the alkalinity, total hardness and carbonate hardness in units of mg/L CaCO3. (Note: you may want to refer back to our notes on units and recall that CaCO3 has 2 eq/mol.) Ion Conc. (mg/L) MW (g/mol) Equiv. Conc. (meq/I) Conc (mg/L as CaCO3) Ca2+ 30 40 Mg2+ 10 24.3 Na+ 12 23 CI- 11 35.5 Alk (HCO3) 110 61 2. Jar testing conducted with the water described in problem 1 determined an optimum alum dose of 20 mg/L for particle removal. Based on this alum dose, determine (a) the amount of natural alkalinity (mg/L as CaCO3) consumed, (b) the amount of alkalinity remaining, and (c) the amount of alum required (kg/yr) if the treated flow is 10 MGD. 3. The particles created at the conclusion of the rapid mix step associated with the alum addition in problem 2 have an average diameter of 20 μm and specific gravity of 2.0. During flocculation, the size increases to 75 μm, but the more open aggregate structure decreases the specific gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How does the change in particle properties impact the settling velocity? Make sure to check the Reynolds Number. 4. For this system, it is proposed to use a mechanical rapid-mix tank to add and mix the alum and a horizontal-shaft paddle flocculator to aid in floc formation. Use typical design values noted in the text (or notes) to determine the volume and power required for both units.

1. Based on the following water composition, determine the alkalinity, total hardness and carbonate hardness in units of mg/L CaCO3. (Note: you may want to refer back to our notes on units and recall that CaCO3 has 2 eq/mol.) Ion Conc. (mg/L) MW (g/mol) Equiv. Conc. (meq/I) Conc (mg/L as CaCO3) Ca2+ 30 40 Mg2+ 10 24.3 Na+ 12 23 CI- 11 35.5 Alk (HCO3) 110 61 2. Jar testing conducted with the water described in problem 1 determined an optimum alum dose of 20 mg/L for particle removal. Based on this alum dose, determine (a) the amount of natural alkalinity (mg/L as CaCO3) consumed, (b) the amount of alkalinity remaining, and (c) the amount of alum required (kg/yr) if the treated flow is 10 MGD. 3. The particles created at the conclusion of the rapid mix step associated with the alum addition in problem 2 have an average diameter of 20 μm and specific gravity of 2.0. During flocculation, the size increases to 75 μm, but the more open aggregate structure decreases the specific gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How does the change in particle properties impact the settling velocity? Make sure to check the Reynolds Number. 4. For this system, it is proposed to use a mechanical rapid-mix tank to add and mix the alum and a horizontal-shaft paddle flocculator to aid in floc formation. Use typical design values noted in the text (or notes) to determine the volume and power required for both units.

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
See similar textbooks
icon
Related questions
Question

Need help with Only Question 4 pls

1. Based on the following water composition, determine the alkalinity, total hardness and carbonate hardness in units of mg/L CaCO3. (Note: you may want to refer back to our notes on units and recall that CaCO3 has 2 eq/mol.) lon Conc. (mg/L) MW (g/mol) Equiv. Conc. (meq/l) Ca²+ Mg2+ Na+ 30 10 12 CI- 11 Alk (HCO3) 110 40 24.3 23 35.5 61 Conc (mg/L as CaCO3) 2. Jar testing conducted with the water described in problem 1 determined an optimum alum dose of 20 mg/L for particle removal. Based on this alum dose, determine (a) the amount of natural alkalinity (mg/L as CaCO3) consumed, (b) the amount of alkalinity remaining, and (c) the amount of alum required (kg/yr) if the treated flow is 10 MGD. 3. The particles created at the conclusion of the rapid mix step associated with the alum addition in problem 2 have an average diameter of 20 µm and specific gravity of 2.0. During flocculation, the size increases to 75 µm, but the more open aggregate structure decreases the specific gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How does the change in particle properties impact the settling velocity? Make sure to check the Reynolds Number. 4. For this system, it is proposed to use a mechanical rapid-mix tank to add and mix the alum and a horizontal-shaft paddle flocculator to aid in floc formation. Use typical design values noted in the text (or notes) to determine the volume and power required for both units.
Transcribed Image Text:1. Based on the following water composition, determine the alkalinity, total hardness and carbonate hardness in units of mg/L CaCO3. (Note: you may want to refer back to our notes on units and recall that CaCO3 has 2 eq/mol.) lon Conc. (mg/L) MW (g/mol) Equiv. Conc. (meq/l) Ca²+ Mg2+ Na+ 30 10 12 CI- 11 Alk (HCO3) 110 40 24.3 23 35.5 61 Conc (mg/L as CaCO3) 2. Jar testing conducted with the water described in problem 1 determined an optimum alum dose of 20 mg/L for particle removal. Based on this alum dose, determine (a) the amount of natural alkalinity (mg/L as CaCO3) consumed, (b) the amount of alkalinity remaining, and (c) the amount of alum required (kg/yr) if the treated flow is 10 MGD. 3. The particles created at the conclusion of the rapid mix step associated with the alum addition in problem 2 have an average diameter of 20 µm and specific gravity of 2.0. During flocculation, the size increases to 75 µm, but the more open aggregate structure decreases the specific gravity to 1.9. The water temp is 18 °C. Calculate the settling velocity of both particles. How does the change in particle properties impact the settling velocity? Make sure to check the Reynolds Number. 4. For this system, it is proposed to use a mechanical rapid-mix tank to add and mix the alum and a horizontal-shaft paddle flocculator to aid in floc formation. Use typical design values noted in the text (or notes) to determine the volume and power required for both units.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Process Dynamics and Control, 4e
Process Dynamics and Control, 4e
Chemical Engineering
ISBN:
9781119285915
Author:
Seborg
Publisher:
WILEY
Industrial Plastics: Theory and Applications
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The
SEE MORE TEXTBOOKS