Chemistry, 24.12.2020 03:40 limelight11

A lime-soda softening plant treats a flow of 100 MGD, and the water has a hardness of 230 mg/L as CaCO3 and alkalinity of 185 mg/L as CaCO3, a Mg2 ion content of 42 mg/L, and 4 mg/L of CO2. Assume the system requires the addition of 1.25 meq/L of quicklime to raise the pH to a sufficient level that any precipitation will take place; this quicklime is in addition to any other quicklime needed. The commercial grade of quicklime has a purity of 88%, and the soda ash has a purity of 93%. Determine: The pounds of quicklime and soda ash required per million gallons. The tons of quicklime and soda ash required per month if a month is considered to be 30 days.

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A lime-soda softening plant treats a flow of 100 MGD, and the water has a hardness of 230 mg/L as Ca...

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