You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)2) and soda ash (Na2CO3). Chemical analysis of the water revealed the constituent concentrations in the table below. Concentration Molecular Weight CO2 6 mg/L 44 g/mol Ca2+ 20 mg/L 40 g/mol Mg2+ 10 mg/L 24.4 g/mol Na+ 5 mg/L 23 g/mol Alkalinity 105 mg/L 100 g/mol SO42- 4 mg/L 96 g/mol Cl- 7 mg/L 35.5 g/mol
You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)2) and soda ash (Na2CO3). Chemical analysis of the water revealed the constituent concentrations in the table below. Concentration Molecular Weight CO2 6 mg/L 44 g/mol Ca2+ 20 mg/L 40 g/mol Mg2+ 10 mg/L 24.4 g/mol Na+ 5 mg/L 23 g/mol Alkalinity 105 mg/L 100 g/mol SO42- 4 mg/L 96 g/mol Cl- 7 mg/L 35.5 g/mol
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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- You need to soften water at a 20 MGD potable water treatment facility using lime (Ca(OH)2) and soda ash (Na2CO3). Chemical analysis of the water revealed the constituent concentrations in the table below.
|
Concentration |
Molecular Weight |
||
CO2 |
6 |
mg/L |
44 |
g/mol |
Ca2+ |
20 |
mg/L |
40 |
g/mol |
Mg2+ |
10 |
mg/L |
24.4 |
g/mol |
Na+ |
5 |
mg/L |
23 |
g/mol |
Alkalinity |
105 |
mg/L |
100 |
g/mol |
SO42- |
4 |
mg/L |
96 |
g/mol |
Cl- |
7 |
mg/L |
35.5 |
g/mol |
- What is the Carbonate Harness (concentration) in this system?
- Calculate the quantity of softening materials required on a daily basis for and excess lime treatment process (assume 24 hr operation).
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