Tennessee Wastewater Operator Practice Exam

What does BOD stand for in wastewater treatment?

1. Biochemical oxygen demand

2. Biological oxygen dilution

3. Biological oxidant deployment

4. Biochemical organic discharge

The correct answer is: Biochemical oxygen demand

BOD stands for Biochemical Oxygen Demand, which is a critical measurement in wastewater treatment processes. It quantifies the amount of oxygen that microorganisms will consume while decomposing organic matter in a water sample over a specific period, usually five days, at a controlled temperature. This parameter is essential for assessing the organic pollution level in wastewater. A high BOD indicates a greater concentration of organic material, which leads to increased oxygen consumption when treated, potentially harming aquatic life if discharged untreated into waterways. By measuring BOD, operators can evaluate the effectiveness of treatment processes, monitor the impact of discharges on the receiving environment, and ensure compliance with regulatory standards. The other options present variations on the term BOD, but they do not accurately describe the true definition or purpose of this important measurement in water quality and treatment. Understanding BOD is vital for wastewater operators to manage the treatment process effectively and protect environmental health.