Coagulant dosage and optimum pH were determined to be 50 mg/l of ferric sulfate [Fe2(SO4)3] and 6.6 respectively from Jar tests. The bicarbonate alkalinity in the water is found to be 20 mg/l as ion. The plant treats 40,000 m3/day of water and has 25 mg/l of suspended and colloidal solids. The ferric salt reaction in water is given below: (Atomic Weights: Fe-55.9, C-12, H-1, O-16, S-32, Ca-40) Fe2(SO4)3.xH2O + 6HCO3 − ⇔ 2Fe(OH)3(??) + xH2?? + 3SO4 2- + 6CO2 How much alkalinity (mg/l as CaCO3) will remain in water? If alkalinity is deficient then how much ferric salt will need to be neutralized and how do we neutralize the water?
Coagulant dosage and optimum pH were determined to be 50 mg/l of ferric sulfate [Fe2(SO4)3] and 6.6 respectively from Jar tests. The bicarbonate alkalinity in the water is found to be 20 mg/l as ion. The plant treats 40,000 m3/day of water and has 25 mg/l of suspended and colloidal solids. The ferric salt reaction in water is given below: (Atomic Weights: Fe-55.9, C-12, H-1, O-16, S-32, Ca-40) Fe2(SO4)3.xH2O + 6HCO3 − ⇔ 2Fe(OH)3(??) + xH2?? + 3SO4 2- + 6CO2 How much alkalinity (mg/l as CaCO3) will remain in water? If alkalinity is deficient then how much ferric salt will need to be neutralized and how do we neutralize the water?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Coagulant dosage and optimum pH were determined to be 50 mg/l of ferric sulfate [Fe2(SO4)3] and 6.6 respectively from Jar tests. The bicarbonate alkalinity in the water is found to be 20 mg/l as ion. The plant treats 40,000 m3/day of water and has 25 mg/l of suspended and colloidal solids. The ferric salt reaction in water is given below: (Atomic Weights: Fe-55.9, C-12, H-1, O-16, S-32, Ca-40) Fe2(SO4)3.xH2O + 6HCO3 − ⇔ 2Fe(OH)3(??) + xH2?? + 3SO4 2- + 6CO2 How much alkalinity (mg/l as CaCO3) will remain in water? If alkalinity is deficient then how much ferric salt will need to be neutralized and how do we neutralize the water?
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