Wastewater New York State Practice Exam

What is a benefit of using a pure oxygen activated sludge process related to tank volume?

1. Requires larger tank volume

2. Less tank volume is required

3. Tank volume is irrelevant

4. No effect on tank volume

The correct answer is: Less tank volume is required

The benefit of using a pure oxygen activated sludge process in relation to tank volume is that it requires less tank volume. This is primarily due to the efficiency of the pure oxygen system in supporting higher rates of microbial activity. In pure oxygen processes, because oxygen is provided more effectively and at higher concentrations than in traditional air systems, microorganisms can achieve greater rates of respiration and, consequently, faster rates of sludge growth and settling. This increased efficiency allows for the biological treatment process to be completed in a smaller volume of tank space. A reduction in tank volume not only saves on construction and infrastructure costs but also reduces the overall footprint of the treatment plant. As a result, operators can maintain effective treatment while optimizing space and resources.