Question 6005 of 234 · California Wastewater Operator Exam
A steadily rising volatile acids to alkalinity ratio in an anaerobic digester is mainly a warning of
Exactly one answer is correct.
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Correct answer to question 6005
- A: a developing digester upset (souring)
Explanation
Volatile acids rise before pH drops, so a climbing ratio shows that the buffer is being used up. EPA's digester guidebook suggests more frequent testing once the ratio reaches about 0.25.
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