Cations Ca2+ Mg2+ Nat CO Problem 2 (Water Sample #2) mg/L Anions 53.0 HCO 18.3 SO2- 52.6 Cl- 6.8 pH mg/L 134.0 74.4 95.5 7.5 For each of three water samples (Problems 1-3), calculate the amount of generated sludge (a) report in 1b/day (mass of solids in sludge); and (b) in gallon/day (volume of the sludge) if the sludge contains 11% solids, specific gravity of the sludge is 1.0. Take total residual hardness be 40 mg/L as CaCO3. An excess of 35 mg/L as CaO of lime is added for softening. Both of added lime and soda ash are 100% pure. Treated flow rate is 1 MGD