Lagoons used for purification of polluted water – McqOptions

MCQOPTIONS

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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