California Wastewater Treatment Operator Practice Exam

What does CBOD stand for in wastewater treatment?

1. Carbon-based Organic Bacterial Oxidation Demand

2. Chemical Biochemical Oxide Demand

3. Carbonaceous Biochemical Oxygen Demand

4. Combined Biochemical Oxygen Demand

The correct answer is: Carbonaceous Biochemical Oxygen Demand

CBOD stands for Carbonaceous Biochemical Oxygen Demand, which is a vital parameter in wastewater treatment processes. This measurement reflects the amount of oxygen that microorganisms will consume while decomposing organic matter in a sample of water. Specifically, it focuses on the carbon content of the biodegradable organic material, indicating the degree of pollution present. Understanding CBOD is crucial because it helps operators determine the potential impact of wastewater on the environment, as higher levels of CBOD can lead to oxygen depletion in receiving waters, harming aquatic life. This metric is essential for designing and operating treatment facilities, as it influences decisions regarding treatment processes and the assessment of effluent quality. The other options either mischaracterize the components of the measurement or introduce incorrect terminology that does not accurately represent the concept of CBOD in the context of wastewater treatment.