Question 3022 of 234 · California Wastewater Operator Exam
State design criteria based on the Ten States Standards commonly recommend a primary clarifier weir loading rate in which range?
Exactly one answer is correct.
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Correct answer to question 3022
- A: 10,000 to 40,000 gallons per day per foot of weir
Explanation
Design criteria such as Mississippi DEQ chapter 60 (section 62.4.3) recommend weir loadings of 10,000 to 40,000 gpd/ft. Some states cap small plants (1.0 MGD or less) at 10,000 gpd/ft. High rates create upward velocities near the weir that carry out solids.
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