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For the particles in problem 3, determine the percent removal in a sedimentation basin with a depth of 2.5 m, width of 4 m and length 40 m at a flowrate of 10 MGD. How much do the particle properties influence removal?

For the particles in problem 3, determine the percent removal in a sedimentation basin with a depth of 2.5 m, width of 4 m and length 40 m at a flowrate of 10 MGD. How much do the particle properties influence removal?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 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+ CI- 11 Alk (HCO3) 110 30 10 12 40 24.3 23 35.5 61 Conc (mg/Las 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. 5. For the particles in problem 3, determine the percent removal in a sedimentation basin with a depth of 2.5 m, width of 4 m and length 40 m at a flowrate of 10 MGD. How much do the particle properties influence removal?
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+ CI- 11 Alk (HCO3) 110 30 10 12 40 24.3 23 35.5 61 Conc (mg/Las 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. 5. For the particles in problem 3, determine the percent removal in a sedimentation basin with a depth of 2.5 m, width of 4 m and length 40 m at a flowrate of 10 MGD. How much do the particle properties influence removal?
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