Question 4017 of 234 · California Wastewater Operator Exam
Rising sludge or floating clumps in a secondary clarifier on a hot day is often caused by
Exactly one answer is correct.
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Correct answer to question 4017
- A: denitrification releasing nitrogen gas bubbles from the settled sludge
Explanation
Nitrogen gas formed in the sludge blanket makes clumps buoyant. Increasing the RAS rate to shorten sludge retention in the clarifier can help.
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