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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 18, 2026

High dissolved oxygen
Low sludge age
Excessive growth of filamentous microorganisms
High settling velocity

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The Correct Option is C

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