What is the impact of low dissolved oxygen (DO) levels in an aeration tank?

Low dissolved oxygen (DO) levels in an aeration tank significantly reduce treatment efficiency. Aeration tanks rely on oxygen to support aerobic microorganisms that break down organic matter. These microorganisms require adequate oxygen levels to metabolize effectively and carry out the biological processes necessary for wastewater treatment. When DO levels drop, the aerobic microorganisms struggle to thrive and perform their functions, leading to an inadequate breakdown of pollutants and organic materials.

Consequently, this inefficiency can result in higher levels of biochemical oxygen demand (BOD) in the effluent, which can negatively affect downstream processes and the quality of discharged water. Sufficient DO levels are critical for ensuring that the treatment process operates optimally and meets regulatory standards for effluent quality. This is why low dissolved oxygen levels are detrimental to the overall effectiveness of wastewater treatment in aeration tanks.