Tennessee Wastewater Operator Practice Exam

What is a major issue caused by some species of cyanobacteria in wastewater pond systems?

1. They enhance water clarity

2. They produce toxins

3. They increase nutrient levels

4. They promote anaerobic conditions

The correct answer is: They produce toxins

Cyanobacteria, also known as blue-green algae, can produce a variety of toxins that pose significant risks to environmental and human health. When these organisms proliferate in wastewater pond systems, particularly in nutrient-rich conditions, they can form harmful algal blooms. The presence of these blooms can lead to the release of toxins such as microcystins and anatoxins, which can contaminate the water and pose health threats to aquatic life, animals, and humans who may come into contact with the water or consume affected organisms. The production of toxins is a major concern in wastewater management, as it can compromise the safety of treated water intended for irrigation or discharge and can complicate further treatment processes, making it essential for operators to monitor and manage cyanobacterial populations effectively. Understanding the toxic effects of cyanobacteria helps in ensuring safe wastewater practices and protecting public health.