The extended aeration process has
- Ahigher F/M ratio
- Bhigh MLSS concentrationCorrect
- Clower aeration time
- Dlow requirement of Air or Oxygen
Solution
Concept
Extended aeration
Step-by-step solution
1. Extended aeration has a low F/M ratio, long aeration time (18–36 h), high MLSS and high oxygen requirement. 2. Only the high MLSS statement is correct.
Explanation
Extended aeration has a low F/M ratio, long aeration time (18–36 h), high MLSS and high oxygen requirement.
Why the other options are wrong
A, C and D are the opposite of the process characteristics.
Shortcut
Extended aeration: low F/M, long time, high MLSS.
Correct answer: B) high MLSS concentration