Question:
Sludge bulking in an activated sludge process is mainly due to
Sludge bulking in an activated sludge process is mainly due to
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Bulking sludge:
\[
\boxed{
\text{Filamentous bacterial growth}
\rightarrow
\text{Poor settling}
\rightarrow
\text{High SVI}
}
\]
Updated On: Jul 23, 2026
- High dissolved oxygen
- Low sludge age
- Excessive growth of filamentous microorganisms
- High settling velocity
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The Correct Option is C
Solution and Explanation
Sludge bulking occurs when filamentous microorganisms grow excessively and interfere with compact floc formation.
As a result, the sludge settles poorly and occupies a larger volume.
Hence,
\[
\boxed{\text{Excessive growth of filamentous microorganisms}}
\]
is the correct answer.
Therefore,
\[
\boxed{(C)}
\]
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