Question

Ferric sulfate is available as a commercial coagulant, and is effective for removing turbidity and color....

Ferric sulfate is available as a commercial coagulant, and is effective for removing turbidity and color. The chemical reaction for its addition to water is: Fe2(SO4)3 + 3Ca(HCO3)2 ----> 2 Fe(OH)3 (s) + 3CaSO4 + 6CO2 Results of a jar test to determine the optimal coagulant dose showed that 20 mg/L of ferric sulfate was optimal. The raw water has an alkalinity of 60 mg/L as CaCO3. a. How much ferric sulfate is needed per day to treat 1 MGD. b. What mass of solids is produced per day based solely on the addition of the coagulant? c. Assuming the alkalinity is approximately equal to the HCO3- concentration, is there sufficient alkalinity in the raw water to use ferric sulfate?

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