Find out the lime and soda ash dose, in mg/L as CaCO3 to soften the following water to a final hardness of less than 90 mg/L as CaCO3. If the price of lime purchased as CaO is $6.170 per megagram (Mg) as well as the price of soda ash, purchased as Na2CO3 is $ 172.50 per Mg. Explain what is the annual chemical cost of treating 0.050 m3/s of this water? Presume the lime is 90% pure and the soda ash is 97% pure. State the ion concentrations reported below are all mg/L as CaCO
Ca+2= 137
Mg+2= 60
HCO3 = 197
CO2 = 9