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

The 5-day biochemical oxygen demand is 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 5-day BOD or BOD₅.