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Wastewater Treatment Operator Certification Test
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Question Number 17
Sludge septicity in the primary clarifier can be recognized when: A. sludge gasification causes large clumps of sludge to float on the water surface. B. Primary clarifier foam is blackC. The Specific Oxygen Uptake Rate (SOUR) in the primary clarifier is greater than 3000 mg O2/L/hrD. The sludge contains from 4.0 to 8.0 percent dry solids in TS laboratory testingE. All of the above
A. sludge gasification causes large clumps of sludge to float on the water surface.
✔ Correct Answer:
A. sludge gasification causes large clumps of sludge to float on the water surface.
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