The abbreviation BOD stands for which of the following?

The abbreviation BOD stands for which of the following?

• A. Biological oxygen density
• B. Bacteria oxygen difference
• C. Biochemical oxygen demand
• D. Basic oxygen demand

Answer: (C)

BOD measures how much oxygen microbes need to break down organic matter in water, so the abbreviation stands for Biochemical Oxygen Demand. This value helps gauge how polluted the water is and how much treatment it may require. In practice, BOD is often reported as BOD5, the amount of oxygen consumed over five days at 20°C, using a sealed sample to prevent gas exchange. A higher BOD means more organic pollution and less oxygen available for aquatic life, which is why BOD is a key indicator of water quality and wastewater strength. The other phrases aren’t used in standard terminology—Biological oxygen density, Bacteria oxygen difference, and Basic oxygen demand aren’t recognized terms in this context.

BOD measures how much oxygen microbes need to break down organic matter in water, so the abbreviation stands for Biochemical Oxygen Demand. This value helps gauge how polluted the water is and how much treatment it may require. In practice, BOD is often reported as BOD5, the amount of oxygen consumed over five days at 20°C, using a sealed sample to prevent gas exchange. A higher BOD means more organic pollution and less oxygen available for aquatic life, which is why BOD is a key indicator of water quality and wastewater strength. The other phrases aren’t used in standard terminology—Biological oxygen density, Bacteria oxygen difference, and Basic oxygen demand aren’t recognized terms in this context.