1.

Consider the following tertiary treatment methods for treatment of waste water:1. Ion-exchange method2. Reverse osmosis3. Chemical oxidation method4. Activated sludge processWhich of the above methods are correct ?

A. 1, 2 and 4
B. 1, 3 and 4
C. 2, 3 and 4
D. 1, 2 and 3
Answer» E.


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