You are being consulted for the design of a coagulation-flocculation basin for a water treatment plant. Ferric sulfate is available as a commercial coagulant and is popular at removing turbidity and color. The chemical reaction for its addition to water is: Fe2(SO4)3 + 3Ca(HCO3)2 ----> 2Fe(OH)3 (s) + 3CaSO4 + 6CO2 Results of a jar test to determine the optimal coagulant dose are provided below. The initial water sample has a pH=6.5 and turbidity of 30 NTU. Ferric sulfate dose, mg/L: 5 10 15 20 25 Turbudity, NTU: 15 5 1 0.9 2 What is the optimal mass of ferric sulfate you would need to purchase every day to treat 106 gallons/day to a turbidity below 1 NTU (assume 100
You are being consulted for the design of a coagulation-flocculation basin for a water treatment
plant. Ferric sulfate is available as a commercial coagulant and is popular at removing turbidity and
color. The chemical reaction for its addition to water is:
Fe2(SO4)3 + 3Ca(HCO3)2 ----> 2Fe(OH)3 (s) + 3CaSO4 + 6CO2
Results of a jar test to determine the optimal coagulant dose are provided below. The initial water
sample has a pH=6.5 and turbidity of 30 NTU.
Ferric sulfate dose, mg/L: 5 10 15 20 25
Turbudity, NTU: 15 5 1 0.9 2
What is the optimal mass of ferric sulfate you would need to purchase every day to treat 106 gallons/day
to a turbidity below 1 NTU (assume 100% purity of the coagulant).
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