Question
Biology Question on Wastewater
In sewage treatment, secondary treatment is considered highly significant, because
A
It helps to remove debris from the sewage.
B
It reduces the BOD level of sewage.
C
It helps in the production of biogas.
D
It increases the organic content of sewage.
Answer
It reduces the BOD level of sewage.
Explanation
Solution
The correct answer is (B) :It reduces the BOD level of sewage.