Consider the following tertiary treatment methods for treatm

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ESE (IES) EE 2017 (Non Technical)
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Engineering aptitude

9

M: +2.00/-0.66

Consider the following tertiary treatment methods for treatment of waste water :
1. Ion-exchange method
2. Reverse osmosis
3. Chemical oxidation method
4. Activated sludge process
Which of the above methods are correct?

[ESE (IES) EE 2017 (Non Technical)]

A 1, 2 and 4

B 1, 3 and 4

C 2, 3 and 4

D 1, 2 and 3