The results from a jar test for coagulation of a turbid alkaline raw water are given in the table. Each jar contained 1000 ml of water The aluminum sulfate solution used for chemical addition had such strength that each milliliter of the solution added to a jar of water produced a concentration of 8.0 mg/l of aluminum sulfate,
(a) Based on the jar lest results, what is the most economical dosage of aluminum sulfate in mg/l?
Jar
Aluminum Sulfate Solution (ml)
Floe Formation
1
2
3
4
5
6
1
2
3
4
5
6
None
Smoky
Fair
Good
Good
Very heavy
(b) If another jar had been filled with freshly distilled water and dosed with 5 ml of aluminum sulfate solution, what would have been the degree of floe formation?
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