Results of a jar-test demonstration on alum coagulation are listed in the following table. (Jar testing is discussed in Section 211.) Jars 1 through 5 contained a clay suspension in tap water; jai 6 was a clay suspension in distilled water
Jar | Alum Dosage | Floc Formation |
1 | 0 mg/1 | None |
2 | 5 mg/1 | Smoky |
3 | 10 mg/1 | Fair |
4 | 15 mg/1 | Good |
5 | 20 mg/1 | Fleavy |
6 | 20 mg/l | None |
(a) What is the lowest recommended dosage for treating this water?
(b) Why didn’t the clay suspension in jar 6 destabilize?
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