Question

The design factors which are critical for an activated sludge treatment plant are

• A. Maximum and minimum flow rate
• B. Maximum hourly flow
• C. Maximum hourly flow and maximum daily organic load
• D. Maximum hourly flow and minimum daily organic load

Hint:

Activated sludge plant design mainly depends on \[ \boxed{ \text{Hydraulic Loading} \quad\text{and}\quad \text{Organic Loading (BOD).} } \]

Answer 1

The Correct Option is C

Step 1: Recall the design requirements of an activated sludge plant. The plant should be capable of handling both hydraulic and organic load fluctuations.

Step 2: Identify the governing design factors. The critical design parameters are - Maximum hourly flow (hydraulic loading) - Maximum daily organic load (BOD loading) Hence, \[ \boxed{\text{Maximum hourly flow and maximum daily organic load}} \] is the correct answer. Therefore, \[ \boxed{(C)} \] is the correct answer.