Question 3012 of 234 · California Wastewater Operator Exam
The typical detention time in a primary clarifier is
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Correct answer to question 3012
- C: 1.5 to 3.0 hours
Explanation
EPA operator training material gives a detention time of 1.5 to 3.0 hours for primary clarifiers. A very long time causes septic sludge and odors.
More questions: Preliminary and Primary Treatment
- 3013Which problem is most likely to result from leaving sludge in a primary clarifier too long?
- 3014A primary clarifier's overflow rate is calculated by dividing
- 3015If the flow to a clarifier increases and nothing else changes, the surface overflow rate will
- 3016Scum collected from a primary clarifier is normally sent to
- 3017Which is the best indicator that a primary clarifier is being operated properly?
- 3018Pumping primary sludge too infrequently will most likely cause