Water and Wastewater Terms Beginning B

A B C D E F G H I J K L M N O P Q R S T U V W Y Z

BOD₅

Refers to the five-day biochemical oxygen demand. The total amount of oxygen used by microorganisms decomposing organic matter increases each day until the ultimate BOD is reached, usually in 50 to 70 days. BOD usually refers to the five-day BOD or BOD₅.