Ontario Operator-in-Training (OIT) Practice Exam

What type of bacteria is primarily involved in aerobic lagoons?

1. Anaerobic bacteria

2. Coliform bacteria

3. Aerobic bacteria

4. Pathogenic bacteria

The correct answer is: Aerobic bacteria

The type of bacteria primarily involved in aerobic lagoons is aerobic bacteria. Aerobic lagoons are designed to treat wastewater through the action of microorganisms that require oxygen to survive and thrive. These bacteria play a crucial role in the biological treatment process by breaking down organic matter in the presence of oxygen, resulting in the purification of the effluent and stabilization of the wastewater. In aerobic lagoons, the presence of oxygen is essential because it supports the metabolic processes of these bacteria, allowing them to efficiently decompose organic pollutants. Aerobic bacteria also help to reduce odors, which can be a concern in waste management facilities. Understanding the role of aerobic bacteria helps in appreciating how wastewater treatment facilities function and why selecting the appropriate treatment method, like aerobic lagoons, is vital for effective wastewater management. Other types of bacteria, such as anaerobic bacteria, do not thrive in environments with oxygen and therefore are not typical participants in aerobic lagoon processes.