3. (2.5 points) Background: Residual turbidity refers to the turbidity ater (res

Question

3. (2.5 points) Background: Residual turbidity refers to the turbidity ater (residuon coagulation, flocculation and sedimentation process. Coagulationmoc, ulation cannot achieve 100% particle removal. The remaining or residual particles will be further removed during filtration, the next treatment step. A jar test is performed in the laboratory of water treatment plants to determine the optimum coagulant dosage (the minimum coagulant dosage to achieve the sufficient turbidity removal or low(est) residual turbidity) from the relationship between residual turbidity and coagulant dosage. At the Based on the following plot, what the optimus alum dosage wil be? Each mole of alum consumes 6 moles of HCO, alkalinity (or 1 mg/t of alum consumes 0.6 mg/l of HCO, alkalinity). Cakulate how much HCO, alkalinity as CaCO, is consumed at your determined optimum alum dosage. 20 20 40 60 80 Alum dosage (mg/L) Figure for Question 3.R

Explanation / Answer

From the figure we can see that optimum dosage of alum is 20 mg/L

1 mg/L Alum consumes 0.6 mg/L HCO3

Hence 20 mg/L will consume 20*0.6=12 mg/L HCO3

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