Q. BOD of effluent from secondary biological treatment of sewage is

A
0 to 5% of the original
B
5 to 10% of the original
C
25 to 40% of the original
D
50 to 60% of the original
Solution:
  • 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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