Question

A 35 MGD surface Water treatement plant proposes to to use alum Coagulation for turbidity reduction using 44 mg/ L alum. the raw water has an alkalinity of 80 mg / L as CaCO3. Commercial alum has the Formula Al2(SO4)3 X 18H2O (MW= 666).
A) determine the daily Alum Dosage Required in Kg/ day?

B) Using the Equivalent concept , how much alkalinity is used up by the alum added?

C) is the water alkalinity adequate. i.e , is it grater than the alkalinity consumed by alum?

Answer 1

C) is the water alkainty adequate. I.e