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1. A groundwater contains the following constituents: CO2 = 9.6 mg/L Ca2+ = 95.2 mg/L Mg2+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 10° L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% CaO by weight and the soda ash is pure sodium carbonate.

1. A groundwater contains the following constituents: CO2 = 9.6 mg/L Ca2+ = 95.2 mg/L Mg2+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 10° L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% CaO by weight and the soda ash is pure sodium carbonate.

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 groundwater contains the following constituents: CO2 = 9.6 mg/L Ca?+ = 95.2 mg/L 1. Mg?+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 106 L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% Cao by weight and the soda ash is pure sodium carbonate.
Transcribed Image Text:A groundwater contains the following constituents: CO2 = 9.6 mg/L Ca?+ = 95.2 mg/L 1. Mg?+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 106 L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% Cao by weight and the soda ash is pure sodium carbonate.
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