Question:
Under normal conditions, the percentage of BOD removal during primary treatment is about
Under normal conditions, the percentage of BOD removal during primary treatment is about
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Typical removal efficiency during primary treatment:
\[
\boxed{
\begin{aligned}
\text{Suspended Solids} &\approx 50\%-70\%\\
\text{BOD} &\approx 25\%-35\%
\end{aligned}
}
\]
Updated On: Jul 23, 2026
- \(30\%\)
- \(10\%\)
- \(70\%\)
- \(85\%\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the purpose of primary treatment.
Primary treatment mainly removes settleable and floating solids through screening and sedimentation.
Step 2: Recall the typical BOD removal. Under normal operating conditions, primary sedimentation removes approximately \[ \boxed{30\%} \] of the Biochemical Oxygen Demand (BOD). Hence, \[ \boxed{(A)} \] is the correct answer.
Step 2: Recall the typical BOD removal. Under normal operating conditions, primary sedimentation removes approximately \[ \boxed{30\%} \] of the Biochemical Oxygen Demand (BOD). Hence, \[ \boxed{(A)} \] is the correct answer.
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