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 BO
(D) = 3.8 mg/litre
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