Tennessee Wastewater Operator Practice Exam

What is the primary role of microorganisms like amoeboids in an activated sludge system?

1. Decompose organic matter

2. Promote nitrification

3. Consume dissolved oxygen

4. Stabilize sludge

The correct answer is: Decompose organic matter

The primary role of microorganisms, including amoeboids, in an activated sludge system is to decompose organic matter. This biological process is essential for the treatment of wastewater, as it involves breaking down complex organic compounds into simpler forms that can be further processed or removed from the system. Amoeboids, along with other microorganisms in the activated sludge, utilize the organic materials present in the wastewater as a food source. As they metabolize these compounds, they convert them into cellular biomass, carbon dioxide, and other byproducts. This process not only helps in reducing the concentration of pollutants in the water but also contributes to the overall stabilization of the sludge produced in the treatment process, which can be further treated or disposed of. The decomposition of organic matter is critical for maintaining the balance within the activated sludge system, ensuring that the treatment remains effective. By efficiently breaking down wastes, these microorganisms help keep the system functioning properly, preventing the accumulation of harmful substances and allowing for the effective removal of contaminants from the treated water.