Determine the lime and soda ash dose, in mg/L as CaCO3 to soften the following water to a final hardness of less than 120.0 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 Na2CO3 , is $172.50 per Mg, what is the annual chemical cost of treating 1.35 m3 /s of this water? Assume the lime is 87% pure and the soda ash is 97% pure. The ion concentrations reported below are all mg/L as CaCO3.
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