What are the three general forms of bacteria in the activated sludge process?

The three general forms of bacteria in the activated sludge process are classified based on their oxygen requirements and metabolic characteristics. The correct choice highlights Aerobic, Anaerobic, and Facultative bacteria.

Aerobic bacteria require oxygen for their metabolic processes and play a crucial role in breaking down organic matter in the presence of oxygen. They are responsible for the oxidation of waste, which is a key function in the activated sludge process.

Anaerobic bacteria, on the other hand, thrive in environments devoid of oxygen. These bacteria are capable of decomposing organic materials through fermentation processes and are important in certain phases of wastewater treatment, particularly in the digestion of sludge.

Facultative bacteria can switch between aerobic and anaerobic modes of metabolism depending on the availability of oxygen. This flexibility allows them to thrive in diverse conditions within the activated sludge process, supporting the treatment of wastewater under varying operational circumstances.

Recognizing the roles of these three forms of bacteria in wastewater treatment helps in understanding their contribution to the overall efficiency of the activated sludge process.