Question

An RO facility is being designed to treat groundwater containing
the ions given below. Calculate the allowable recovery before scaling
occurs and identify the limiting salt. Assume 100 percent rejection, a
concentration polarization factor of 1.08, and T = 25◦C, and ignore
the impact of ionic strength. The water contains calcium = 105
mg/L, strontium = 2.5 mg/L, barium = 0.0018 mg/L, sulfate = 128
mg/L, fluoride = 1.3 mg/L, and silica = 9.1 mg/L as Si.

Answer 1