BOD of effluent from secondary biological treatment of sewage is

0 to 5% of the original

5 to 10% of the original

25 to 40% of the original

50 to 60% of the original

BOD of effluent from secondary biological treatment of sewage is 5 to 10% of the original.
Primary treatment remove ~60% of solids and ~35% of BOD .
Secondary treatment remove ~85% of BOD and solids.

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