Wastewater New York State Practice Exam

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What is a sign of an aging activated sludge?

  1. Low bacterial counts

  2. High population of protozoa

  3. Absence of rotifers

  4. High levels of oxygen

The correct answer is: High population of protozoa

An aging activated sludge system is characterized by specific biological changes, one of which is the presence of a high population of protozoa. As the sludge ages, the ecosystem within the treatment process evolves, leading to an increase in protozoan populations. Protozoa play a crucial role in the system, as they help control bacterial populations and contribute to the overall health of the sludge. Their presence indicates that there is a sufficient amount of organic material and activity occurring in the system, making it a sign of aging and stability within the activated sludge. While other factors such as low bacterial counts or the absence of rotifers might indicate different issues in a treatment system, they are not indicators of aging activated sludge. Similarly, high levels of oxygen generally reflect aerobic conditions but do not directly assess the age or health of the activated sludge. Thus, the presence of a high population of protozoa effectively signals an aging activated sludge system.

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