A&B Test Questions - Florida Rural Water Association

11. Using the analyses below, calculate the lime dose needed in mg/l as CaO.Atomic Weights: Ca:40, Mg: 24, H:1, C:12, O: 16, Na:23, F:19C02: 10 mg/l, Ca:2l8 mg/l, Mg:32 mg/l, TA: 180mg/l, Temp. 78 FA: 393 mg/lB: 250 mg/lC: 189 mg/lD: 222 mg/lMATH APPLICATIONSection12. Using the dosage from the previous question, calculate the lime demand.Lime 92% pure, flow 3.250 MGD, excess = 7%A: 6998 pounds of limeB: 5959 pounds of limeC: 811 pounds of limeD: 7881 pounds of limeMATH APPLICATIONSection13: Using the following data, calculate the Na 2 CO 3 demand.Raw Water: Ca: 265 mg/l. Mg: 32mg/l, T ALK:16Omg/l CO2: 12 mg/lFin. Water: Ca: 165 mg/l. Mg: 32 mg/I, T ALK: 130 mg/l. C02: 106 mg/lFlow 865,000 gallons, Na 2 CO3: 98 % pureA: 546 pounds of soda ashB: 5l5 pounds of soda ashC: 1069 pounds of soda ashD: 297 pounds of soda ashMATH APPLICATIONSection14: When is MgCO 3 hardness present in water?A: when the total hardness is greater than total alkalinityB: when the total hardness equals total alkalinityC: when the total alkalinity is greater than total hardnessD: when the total alkalinity is twice the total hardness15: Which of the following constituents cause non-carbonate hardness?A: CaSO 4 , CaCO 3 . MgCL2, NaOH & Sr(HCO 3 ) 2B: CaSO 4 . CaCO3, MgCL 2 . NaOH & MnSiO 3C: MgSO 4 , MgCO 3 , NaCL. 2 , Ca(OH) 2 , Fe(HCO3)2D: CaSO 4 , CaCL 2 , MgCL 2 , MgSO 4 , & SrSO 414