Texas Wastewater Class B Practice Exam 2025 - Free Wastewater Class B Practice Questions and Study Guide

Excessive foam buildup in an aeration tank can indicate several underlying problems, with one notable issue being sludge bulking. Sludge bulking occurs when the microorganisms responsible for breaking down organic matter do not settle properly at the bottom of the tank. Instead, they remain in suspension, contributing to the formation of foam on the surface. This foam can impede proper treatment processes and lead to operational challenges.

In addition, foam buildup can also hinder the oxygen transfer efficiency, as it disrupts the aeration system's effectiveness. This might further decrease the performance of microbial activity, which is crucial for the biological treatment of wastewater. Given these factors, addressing foam issues is essential for maintaining the efficiency of the aeration process and ensuring optimal nutrient removal from wastewater.