Question 2013 of 234 · California Wastewater Operator Exam
The dissolved oxygen level in an aeration tank is commonly maintained at
Exactly one answer is correct.
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Correct answer to question 2013
- D: about 1.5 to 3 mg/L
Explanation
Most activated sludge systems operate near 1.5 to 3 mg/L DO in the aeration basin. Lower values can cause poor settling and filaments, and higher values waste energy.
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