Treatment Plant Operator Exam Study Guide Answers

During a visual inspection of the activated sludge aeration basin, you notice a stiff white foam has formed on the surface. What is the most probable condition? The answer to the question is A, young sludge or underloaded system. The formation of stiff white foam on the aeration basin is very typical of young sludge or an underloaded system. The F/M ratio is most likely very high and the MCRT is extremely low. Microscopic observation will show flagellates and amoeba as the highest populations and the MLSS is very low. This is normal on plant startup conditions, or the bacterial population has