1.

Lagoons used for purification of polluted water_______________?

A. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
B. Use micro-organisms/bacteria in presence of dissolved oxygen
C. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre
D. All A., B. & C.
Answer» E.


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