WasteWater Operator Class C Practice Exam

An anaerobic digester offers a key advantage in decreased power consumption compared to an aerobic digester. This is primarily because anaerobic digestion occurs in the absence of oxygen, which eliminates the need for the extensive aeration systems required in aerobic digesters. Aerobic processes demand continuous aeration to maintain the necessary oxygen levels for microorganisms to thrive, which significantly increases energy costs.

In contrast, anaerobic digesters leverage the natural processes of anaerobic bacteria, which can break down organic material without the need for oxygen and thus operate efficiently with lower energy inputs. This makes anaerobic digestion a more energy-efficient option for waste treatment, particularly for facilities aiming to reduce operational costs and their carbon footprint.

While the other choices discuss aspects like solids production and operational ease, they do not directly address the unique energy consumption dynamics that highlight the efficiency of anaerobic digesters.