California Wastewater Treatment Operator Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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Which is true about the temperature in an anaerobic digester?

Temperature should fluctuate widely to promote bacterial diversity

Temperature should be maintained at near-freezing levels

Temperature in a digester should not be changed by more than 1 degree Fahrenheit per day

Temperature in an anaerobic digester needs to be carefully managed to ensure optimal conditions for bacteria to break down organic matter. A fluctuating temperature (A) can negatively impact the growth and activity of bacteria, leading to a less efficient digestion process. Freezing temperatures (B) can also be detrimental, as it can slow down or halt the bacterial activity entirely. Mimicking outdoor ambient conditions (D) would be impractical and ineffective, as outdoor temperatures can vary greatly and may not be suitable for the specific bacteria used in the digester. Therefore, option C - maintaining a stable temperature with small, gradual changes - is the most accurate statement about temperature in an anaerobic digester.

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Temperature should mimic outdoor ambient conditions

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