Which of the following is NOT a detrimental effect that industrial wastewaters may have on a POTW?

The correct answer, which indicates that equalization is not a detrimental effect that industrial wastewaters may have on a Publicly Owned Treatment Works (POTW), reflects an understanding of wastewater treatment processes. Equalization refers to the process of balancing the flow and concentration of wastewater before it enters the treatment system. This step is designed to mitigate the impacts of variable influent characteristics and allow for more consistent treatment.

In contrast, sludge bulking, toxicity, and nutrient overload are all significant concerns associated with untreated or improperly managed industrial wastewater. Sludge bulking can occur when excessive organic matter or certain chemicals interfere with the biological processes, leading to the formation of thick sludge that complicates separation during treatment. Toxicity can impede the performance of biological organisms essential for breaking down waste, affecting the entire treatment process. Nutrient overload, often resulting from excess nitrogen and phosphorus, can lead to algal blooms and other environmental issues downstream from the treatment facilities.

Thus, the role of equalization in a POTW is to help manage and prepare wastewater for treatment, making it a beneficial practice rather than a detrimental impact.