Question

Which is NOT a part of mandatory design considerations of a Rotating Biological Contactor (RBC) system?

• A. Staging of the RBC units and Secondary clarifier design
• B. Loading criteria
• C. Effluent characteristics
• D. Rotation speed

Hint:

• RBC design → Loading, staging, rotation
• Effluent → Outcome, not design input

Answer 1

The Correct Option is C

Concept: A Rotating Biological Contactor (RBC) is a wastewater treatment system where microorganisms grow on rotating discs.
• Design depends on operational and engineering parameters
• Focus is on ensuring proper biological treatment efficiency

Step 1: Understanding design considerations.

• Staging and clarifier design: Important for treatment efficiency → Mandatory.
• Loading criteria: Determines organic load handling → Mandatory.
• Rotation speed: Affects oxygen transfer and biofilm growth → Mandatory.
• Effluent characteristics: Output parameter, not a design parameter → Not mandatory design consideration.

Step 2: Selecting the correct answer.
Thus, effluent characteristics is not a direct design consideration.