Which of the following describes the effect of too much sludge on trickling filters?

Too much sludge in trickling filters can lead to decreased aeration. In a trickling filter system, the primary function is to allow for aerobic bacteria to decompose organic matter in wastewater while being exposed to air for oxygen. When there is an excess of sludge, it can start to clog the filter media or create a thick layer over it. This thickness restricts air movement through the filter, reducing the availability of oxygen that aerobic bacteria need to thrive and efficiently break down the organic matter.

This decrease in aeration can negatively impact the biological process, resulting in suboptimal treatment conditions. The bacteria may become stressed or die off, leading to a decrease in their ability to treat the wastewater effectively. Thus, maintaining the correct balance of sludge is crucial for ensuring adequate aeration, supporting the biological processes that are essential for successful treatment in trickling filters.