Question 4025 of 234 · California Wastewater Operator Exam
Which is a sign of toxic shock to an activated sludge system?
Exactly one answer is correct.
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Correct answer to question 4025
- B: A sudden drop in oxygen uptake and a cloudy effluent with dispersed floc
Explanation
Toxicity reduces microbial activity, so oxygen is not consumed, DO rises and the effluent turns cloudy. Identifying and isolating the source is essential.
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