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 of the above
Answer» E.

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