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A DWTP treats groundwater that contains 50 mg/L of calcium and 24.3 mg/L of magnesium (both as concentration of the ion). The pH of the water is 7.5, carbon dioxide concentration is 20 mg/L (as CO2) and bicarbonate concentration is 244 mg/L (as HCO3). a) What is the dose of lime and soda (in mg/L as CaCO3) required to reduce the hardness to zero? b) How much CaCO3 and Mg(OH)2 sludge is produced (in mg/L as CaCO3)?

A DWTP treats groundwater that contains 50 mg/L of calcium and 24.3 mg/L of magnesium (both as concentration of the ion). The pH of the water is 7.5, carbon dioxide concentration is 20 mg/L (as CO2) and bicarbonate concentration is 244 mg/L (as HCO3). a) What is the dose of lime and soda (in mg/L as CaCO3) required to reduce the hardness to zero? b) How much CaCO3 and Mg(OH)2 sludge is produced (in mg/L as CaCO3)?

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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A DWTP treats groundwater that contains 50 mg/L of calcium and 24.3 mg/L of magnesium (both as concentration of the ion). The pH of the water is 7.5, carbon dioxide concentration is 20 mg/L (as CO2) and bicarbonate concentration is 244 mg/L (as HCO3). a) What is the dose of lime and soda (in mg/L as CaCO3) required to reduce the hardness to zero? b) How much CaCO3 and Mg(OH)2 sludge is produced (in mg/L as CaCO3)?
Transcribed Image Text:A DWTP treats groundwater that contains 50 mg/L of calcium and 24.3 mg/L of magnesium (both as concentration of the ion). The pH of the water is 7.5, carbon dioxide concentration is 20 mg/L (as CO2) and bicarbonate concentration is 244 mg/L (as HCO3). a) What is the dose of lime and soda (in mg/L as CaCO3) required to reduce the hardness to zero? b) How much CaCO3 and Mg(OH)2 sludge is produced (in mg/L as CaCO3)?
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