Question 6017 of 234 · California Wastewater Operator Exam
Waste activated sludge is often thickened by
Exactly one answer is correct.
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Correct answer to question 6017
- A: dissolved air flotation or a gravity belt thickener because it does not settle well
Explanation
WAS is light and flocculent, so mechanical or flotation methods work better than gravity settling in a thickener.
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