coagulation, Civil Engineering

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Incoming water contains 2.5 mg/L as a substance of natural alkalinity (HCO3-). The flow rate is 9.5 ML/day).

(a) What feed rate is required if the alum dose is 7 mg/L and is available with 87% purity.

(b) What is the annual cost of alum if it is available at $234 per Megagram (Mg).

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