The jar test in water treatment is used to determine:
Choose the correct answer
The BOD of raw water
Optimum coagulant dose and type, and optimum pH for coagulation
The hardness of water
Bacteriological quality of water
Correct Answer
B. Optimum coagulant dose and type, and optimum pH for coagulation
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Jar test procedure: samples of raw water in beakers are treated with varying doses of coagulant (alum, ferric sulphate, PAC). Rapid mixing followed by slow mixing simulates flocculation. The dose giving best turbidity removal and strongest floc is the optimum dose. Alum optimum pH = 6.5-7.5.
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