Question 6016 of 234 · California Wastewater Operator Exam
Gravity thickening of primary sludge is mainly used to
Exactly one answer is correct.
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Correct answer to question 6016
- A: increase the solids concentration before digestion
Explanation
Thickening reduces the volume going to digestion, saving heat and capacity. Typical gravity thickeners reach 5 to 8 percent solids for primary sludge.
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