Basic Wastewater Operator Practice Exam

Which organism is typically not found in a healthy lagoon treatment system?

1. Algae

2. Fungi

3. Amoebas

4. Coliform

The correct answer is: Fungi

In a healthy lagoon treatment system, the presence of certain organisms is crucial for effective biological treatment of wastewater. Algae play a beneficial role by using sunlight to photosynthesize, producing oxygen, and contributing to the overall balance of the ecosystem within the lagoon. This process also helps to stabilize nutrients and prevent overly high concentrations that could lead to algal blooms or other imbalances. Amoebas can be present in a lagoon system as they are part of the natural microbial community that can help decompose organic matter. Their role can be beneficial in breaking down nutrients and aiding in the overall treatment process. Coliform bacteria are often monitored as indicators of water quality, specifically for potential fecal contamination. While not directly beneficial, their presence can be an expected aspect of assessing treatment efficiency and ensuring that the water is being adequately treated. Fungi, on the other hand, are typically not a significant component of a healthy lagoon treatment system. They thrive in different conditions and are not commonly associated with the aerobic processes that predominantly govern lagoon treatment. Their presence may indicate an imbalance in the system or areas where organic matter is not being effectively processed, making them less desirable in this specific environment. This understanding highlights the importance of maintaining the right microbial balance in wastewater treatment systems to