Tennessee Wastewater Operator Practice Exam

Which of the following best describes the feed rate to an anaerobic digester?

1. Should be erratic to maintain interest

2. Should be gradual and steady

3. Should be at peak production hours

4. Should vary widely to prevent stagnation

The correct answer is: Should be gradual and steady

The best description of the feed rate to an anaerobic digester is that it should be gradual and steady. This approach is essential for maintaining optimal conditions within the digester, which are necessary for the anaerobic microorganisms to efficiently break down organic matter. A consistent feed rate helps to ensure that the microbial population is not overwhelmed or starved, allowing them to effectively metabolize the substrate and produce biogas. By controlling the feed rate in a gradual and steady manner, the operator can promote stable digestion processes and prevent fluctuations that could lead to negative impacts on the system's performance. Sudden changes or erratic feeding can disturb the balance of microorganisms and lead to decreased biogas production or even process failure. Consistency in the feed rate aids in maintaining a healthy environment for the anaerobic microbial community, optimizing the digestion process and resulting in better operational efficiency.