Repeat Problem 5-2 assuming column leakage is 5.0 mg/L as CaCO3 . Problem 5-2A pilot...

Repeat Problem 5-2 assuming column leakage is 5.0 mg/L as CaCO₃ .

Problem 5-2

A pilot scale ion exchange column was used to develop design data for a softening system for the Village of Calcite. The data are shown below. The design flow rate is 4,000 m³/d. The design final hardness is 120 mg/L as CaCO₃ . Regeneration is to be once per day. The manufacturer’s operating capacity to breakthrough is 60%. Assume a two-column system: one in service and one in regeneration or standby. Also assume that there is no leakage before breakthrough. Use the mass balance technique to determine the mass of resin that will be required.