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Lagoons used for purification of polluted water
Options:
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: Option D
Answer: (d).all (a), (b) & (c).
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