Question 4011 of 234 · California Wastewater Operator Exam
Rotifers in large numbers in the aeration tank suggest
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Correct answer to question 4011
- A: an old sludge and a high level of treatment generally
Explanation
Rotifers appear in older sludge systems with low F/M. They are a sign of stable, good treatment, though too many can indicate an overly old sludge.
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