Question

What is the optimal mass of ferric sulfate you would need to purchase every day to treat
1 x 106 gallons/day to a turbidity below 1 NTU? (assume 100 percent purity of the
coagulant).

Answer 1

Expeeimental dose of coagulant to treat 1 NTU turbidity is 15 mg/l.

1 gal = 3.79 l

1x10^6 gal = 3790000 l

Required mass of ferric sulfate per day is: 15 × 3790000 = 56 850 000 g = 56 850 kg