California Wastewater Treatment Operator Practice Exam

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Study for the California Wastewater Treatment Operator Exam. Use flashcards and multiple-choice questions with detailed explanations to boost your readiness. Prepare with confidence and aim for success!

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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 should mimic outdoor ambient conditions

The correct answer is: 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.