California Wastewater Treatment Operator Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The main function of microorganisms in an aerated lagoon is to aid in the treatment of wastewater. In the context of an aerated lagoon, these microorganisms play a crucial role in the biological treatment processes that break down organic matter present in the wastewater.

Aerated lagoons are designed to facilitate the growth of bacteria and other microorganisms that utilize the organic pollutants as a food source, thereby transforming harmful substances into less harmful forms. The aeration provides the oxygen necessary for aerobic microorganisms to thrive, enhancing their metabolic activity and efficiency in degrading contaminants. This process not only improves the overall quality of the treated water but also helps in nutrient removal, making it suitable for discharge or further treatment.

In considering the other options, while methane production can occur in anaerobic conditions, it is not the primary function in an aerated lagoon, which operates on aerobic processes. Additionally, filtering solids out of water is typically associated with physical treatment methods, rather than the biological processes that take place in lagoons. Lastly, while odor elimination may occur as a byproduct of effective treatment, it is not the main purpose of the microorganisms in the aerated lagoon setting. Their primary role is fundamentally tied to the improvement of water quality through biological degradation of pollutants.