Lagoons used for purification of polluted water_______________?

A. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended

B. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or

C. All A., B. & C.

D. dation ponds

E. Use micro-organisms/bacteria in presence of dissolved oxygen

F. id < 1 mg/litre and BOD = 3.8 mg/litre

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