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  • Activated sludge should have the ability to settle quickly so that it can: a. be rapidly pumped back from sedimentation tank to aeration tank

Activated sludge should have the ability to settle quickly so that it can:

a. be rapidly pumped back from the sedimentation tank to the aeration tank
b. absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank
c. be discarded and anaerobically digested
d. absorb colloidal organic matter

Answers (1)

The answer is option (c) to be discarded and anaerobically digested.

 In the activated sludge process, a portion of the settled sludge is returned to the aeration tank to help maintain a healthy and active microbial population, it is crucial for breaking down organic matter in the wastewater. For this recycling process to work, the sludge must settle quickly in the settling tank so that it can be efficiently pumped back into the aeration tank without disrupting the overall treatment process. The faster the sludge settles, the more efficiently it can be separated from the treated water and reused to support microbial activity, optimizing the system's performance.

Posted by

Gurleen Kaur

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