18. Determine the lime and soda ash dose, in mg/L as CACO3, to soften the following water to a final hardness of 90.0 mg/L as CaCO3. If the price of lime, purchased as CaO, is $61.70 per megagram (Mg), and the price of soda ash, purchased as NazCO is $172.50 per Mg, what is the annual chemical cost of treating 0.050 m'/s of this water? Assume the lime is 90% pure and the soda ash is 97% pure. The ion concen- trations reported below are all mg/L as CaCO3. Ca2+ =137.0 = 40.0 2+ Mg HCO, =197.0 CO2 =9.0 %3D
18. Determine the lime and soda ash dose, in mg/L as CACO3, to soften the following water to a final hardness of 90.0 mg/L as CaCO3. If the price of lime, purchased as CaO, is $61.70 per megagram (Mg), and the price of soda ash, purchased as NazCO is $172.50 per Mg, what is the annual chemical cost of treating 0.050 m'/s of this water? Assume the lime is 90% pure and the soda ash is 97% pure. The ion concen- trations reported below are all mg/L as CaCO3. Ca2+ =137.0 = 40.0 2+ Mg HCO, =197.0 CO2 =9.0 %3D
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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