Florida Wastewater Practice Test

What is a key advantage of an anaerobic digester compared to an aerobic digester?

1. Higher nutrient removal efficiency

2. Decreased power consumption

3. Lower operating costs

4. Faster digestion process

The correct answer is: Decreased power consumption

An anaerobic digester offers a key advantage in terms of decreased power consumption compared to an aerobic digester. In aerobic digestion, the process relies heavily on oxygen, which necessitates the use of aeration systems to introduce air into the digester. This can require significant energy to maintain adequate oxygen levels. Conversely, anaerobic digestion occurs in the absence of oxygen, which eliminates the need for energy-intensive aeration equipment. This characteristic not only reduces operational energy costs but also makes anaerobic digestion a more efficient choice in terms of energy usage. Additionally, anaerobic digesters convert organic matter into biogas, which can be harnessed as a renewable energy source, adding to the overall efficiency of the process. While other options may have their benefits in different contexts, the decreased power consumption is a distinctive and significant advantage of anaerobic digesters, particularly in terms of operational efficiency and sustainability considerations.