A water with low alkalinity of 15 mg/L as CaCO3 will be treated with the ferrous sulphate-lime coagulation. FeSO4 dosage is 18 mg/L. (CaCO3 = 100 g/mol, Ca(HCO3)2 = 162 g/mol, Ca(OH)2 = 74 g/mol, FeSO4.7H₂O = 278 g/mol, Fe(OH)2 = 90 g/mol). Determine the lime dosage needed to react with the ferrous sulphate for sweep coagulation. b. If dissolved oxygen (DO) concentration is 5 mg/L before coagulation, what is of DO after coagulation? concentration

Structural Analysis
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A water with low alkalinity of 15 mg/L as CaCO3 will be treated with the ferrous sulphate-lime
coagulation. FeSO4 dosage is 18 mg/L.
(CaCO3 = 100 g/mol, Ca(HCO3)2 = 162 g/mol, Ca(OH)2 = 74 g/mol, FeSO4.7H₂O = 278 g/mol,
Fe(OH)2 = 90 g/mol).
a. Determine the lime dosage needed to react with the ferrous sulphate for sweep
coagulation.
b. If dissolved oxygen (DO) concentration is 5 mg/L before coagulation, what is
concentration of DO after coagulation?
Transcribed Image Text:A water with low alkalinity of 15 mg/L as CaCO3 will be treated with the ferrous sulphate-lime coagulation. FeSO4 dosage is 18 mg/L. (CaCO3 = 100 g/mol, Ca(HCO3)2 = 162 g/mol, Ca(OH)2 = 74 g/mol, FeSO4.7H₂O = 278 g/mol, Fe(OH)2 = 90 g/mol). a. Determine the lime dosage needed to react with the ferrous sulphate for sweep coagulation. b. If dissolved oxygen (DO) concentration is 5 mg/L before coagulation, what is concentration of DO after coagulation?
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