California Wastewater Treatment Operator Practice Exam

How often should an anaerobic digester be fed?

1. several times a day

2. twice a week

3. once a month

4. as needed

The correct answer is: several times a day

An anaerobic digester should be fed several times a day in order to maintain an optimal level of microorganisms and keep the process of digestion running smoothly. Feeding the digester too infrequently (such as once a month or as needed) can lead to an overgrowth of the microorganisms and an imbalance in the digestion process. Twice a week is a more frequent feeding schedule, but still may not be enough to maintain the necessary balance in the digester. Therefore, the most appropriate option is several times a day.