Tennessee Wastewater Operator Practice Exam

Which of the following is not likely to develop if wastewater remains in the collection system too long?

1. Algae

2. Bacteria

3. Fungi

4. Insects

The correct answer is: Algae

When considering the conditions that result from wastewater remaining in a collection system for an extended period, algae are unlikely to develop due to the lack of sunlight. Algae typically thrive in environments with light, such as open water bodies, where photosynthesis can occur. Wastewater collection systems, which are often closed and dark, do not provide the necessary environment for algae growth. On the other hand, bacteria and fungi are quite resilient and can survive in the anaerobic conditions often found in stagnant wastewater. These microorganisms can proliferate, contributing to the breakdown of organic materials. Similarly, insects are attracted to standing water and decaying organic matter, which can occur in wastewater systems, further supporting the likelihood of their presence in such environments.