A) Primary treatment
B) Secondary treatment
C) Tertiary treatment
D) Reservoir osmosis stage
Correct Answer: B
Solution :
Secondary treatment involves biological treatment while treatment of waste water discharge. It involves the removal of dissolved and colloidal compounds by oxidation. It is usually done through microorganisms for removal of organic compounds. There are three method involved in secondary treatment (i) Biofiltration (ii) Aeration/activated sludge process (iii) Oxidation ponds
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