Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the following water to a final hardness of less than 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 Na2CO3, is $172.50 per Mg. What is the annual chemical cost of treating 0.050 m3/s of this water? Assume the lime is 90% pure and the soda ash is 97% pure. The ion concentrations reported below are all mg/L as CaCO3.
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