Which one of the following statements is correct with respect to Biochemical Oxygen Demand (BOD) A Secondary - Biology - Microbes in Human Welfare

Question

​​Which one of the following statements is correct with
respect to Biochemical Oxygen Demand (BOD)?
A Secondary treatment of eﬄuent decreases the BOD
B Secondary treatment of eﬄuent increases the BOD
C Secondary treatment of eﬄuent does not change the BOD
D Secondary treatment of eﬄuent ﬁrst increases and
then decreases the BOD

Ritik · Accepted Answer

Statement A is correct that is , secondary treatment of effluent
decreases the BOD