Question 6009 of 234 · California Wastewater Operator Exam
Under 40 CFR Part 503 Appendix B, anaerobic digestion counts as a Process to Significantly Reduce Pathogens at 35 to 55 degrees C when the mean cell residence time is at least
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Correct answer to question 6009
- D: 15 days
Explanation
Appendix B, process 3, allows values between 15 days at 35 to 55 degrees C and 60 days at 20 degrees C. Colder digesters need longer residence times.
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