BOD stands for Biochemical Oxygen Demand.

• A. Biochemical Oxygen Demand
• B. Biological Oxygen Decontamination
• C. Bodily Oxygen Discharge
• D. Biochemical Oxidation Demand

Answer: (A)

BOD measures the oxygen that microorganisms need to biologically break down biodegradable organic matter in water. The standard expansion for this acronym is Biochemical Oxygen Demand, which describes the oxygen consumption during the biological oxidation of organics. This is why the statement is correct: it uses the recognized term that reflects oxygen needed for microbial decomposition of organic matter, typically quantified as BOD5 (5 days at 20°C) in mg/L and used to gauge wastewater strength and potential impact on aquatic life. The other phrases aren’t recognized terms in wastewater engineering—Biological Oxygen Decontamination isn’t a standard measure, Bodily Oxygen Discharge isn’t a technical term, and Biochemical Oxidation Demand isn’t the accepted name, even though it describes a similar idea.