Question 1 Alum (Alz (SO4)3 14H2O) is being used in a coagulation process to form precipitate for treating water. A stock solution of alum is prepared on-site with a concentration of 3.21 mol/L [AP]. Below is a jar test data for removing turbidity from raw effluent water. For a plant with a capacity of 30000 m/d, calculate the chemical feed rate in L/min, the alkalinity consumed (expressed as mg L as CaCO;), the amount of precipitate produced in mg/L and kg/day, and the amount of NaOH that would need to be added to counteract the consumption of alkalinity by alum. DOC, mg/L Alum Dose, mg/L 3.35 5 2.56 10 1.21 15 0.8 20 0.6 25 0.55 30 0.5 35 0.48 40 0.46 50 0.47 60 0.52 70 0.62 80 0.68 90 0.76 100 0.83