Tennessee Wastewater Operator Practice Exam

What process is primarily responsible for the breakdown of organic matter in an aerobic digester?

1. Photolysis

2. Thermal decomposition

3. Aerobic digestion

4. Hydrolysis

The correct answer is: Aerobic digestion

The process primarily responsible for the breakdown of organic matter in an aerobic digester is aerobic digestion. This process involves the use of microorganisms that thrive in the presence of oxygen to decompose and mineralize organic materials. As these microorganisms metabolize the organic matter, they convert it into simpler compounds, such as carbon dioxide and water, while also producing biomass. Aerobic digestion is critical in wastewater treatment because it not only reduces the volume of organic waste but also stabilizes the material, ensuring that harmful pathogens are significantly diminished. The efficiency of this process is enhanced through aeration, which maintains adequate oxygen levels required by the aerobic bacteria. Understanding aerobic digestion is essential for wastewater operators, as it allows for better management and optimization of the digester operations, contributing to effective treatment processes. This contrasts with the other options, which do not play a primary role in the aerobic digestion context.