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Ion ExchangeHW - ENV 6015 Ion Exchange/Membrane Problem Set...

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ENV 6015 Ion Exchange/Membrane Problem Set ENV 6015 Ion Exchange 1. A wet resin saturated with calcium ions was placed in a column with a 1 in diameter and 12 in. depth. A strong solution of sodium chloride was passed through the column and effluent was collected until no calcium leaving the column could be detected. The total amount of effluent was 5.0 liters and the calcium concentration in the collected effluent was 1500 mg/1. Show and state the type of ion exchange reaction. Make any assumptions necessary and estimate the resin capacity in meq/ml of resin. 2. Water analysis of water reveals the following: Water Quality Parameter mg/L CO 2 8.8 Ca +2 70 Mg ++ 9.7 Na + 6.9 HCO 3 - 140 SO 4 -2 95 Cl - 10.6 Compute the cost of softening one million gallons of this water with a cation exchanger (Zeolite) which has an exchange capacity of 10,000 grains of hardness per cubic foot and a salt requirement of 0.5 lb. per 100 grain of hardness removed. Assume water is softened to zero hardness and salt (NaCl 100% pure) costs $0.02 per pound. Note 1 grain = 64.8 mg.
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