The presence of dissolved oxygen is essential for which type of bacteria?

The presence of dissolved oxygen is essential for facultative bacteria because these organisms can adapt to both aerobic and anaerobic conditions. They typically use oxygen for respiration when it is available, which allows them to metabolize organic matter more efficiently. In environments with sufficient dissolved oxygen, facultative bacteria can thrive and support the breakdown of waste, contributing to effective wastewater treatment.

While other types of bacteria may also play roles in wastewater processes, their requirements for oxygen vary significantly. Anaerobic bacteria do not require oxygen and may even be inhibited by it, while photoautotrophic bacteria primarily rely on light and carbon dioxide rather than oxygen. Heterotrophic bacteria can exist in both aerobic and anaerobic conditions, but they do not necessarily depend on oxygen as facultative bacteria do.