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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.) MW (g/mol) Equiv. Conc. (meq/I) Conc (mg/L as CaCO3) lon Conc. (mg/L) Ca2+ 30 40 Mg2+ 10 24.3 Na+ 12 23 CI- 11 35.5 Alk (HCO3) 110 61

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.) MW (g/mol) Equiv. Conc. (meq/I) Conc (mg/L as CaCO3) lon Conc. (mg/L) Ca2+ 30 40 Mg2+ 10 24.3 Na+ 12 23 CI- 11 35.5 Alk (HCO3) 110 61

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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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+ 12 CI- 11 Alk (HCO3) 110 30 10 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.
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+ 12 CI- 11 Alk (HCO3) 110 30 10 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.
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