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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. | |