Glossary of Water and Wastewater Terms
A B C D E F G H I J K L M N O P Q R S T U V W Y Z5 random terms from our glossary
rotor
The rotating part of a machine. The rotor is surrounded by the stationary (nonmoving) parts (stator) of the machine.
BOD (biochemical oxygen demand)
A measure of the amount of dissolved oxygen (DO) aerobic organisms consume to generate energy. This process also stabalizes decomposable organic matter under aerobic conditions. The BOD value is commonly expressed as BOD5 and refers to the milligrams of oxygen consumed per liter of water during a 5-day incubation period at 68°F (20°C). In decomposition, organic matter serves as food for the organisms and energy results from its oxidation. BOD is a measurement of the organic strength of wastes in water. Also see COD.
angle of repose
The angle between a horizontal line and the slope or surface of unsupported material, such as gravel, sand, or loose soil. Also called the natural slope.
sewer system
See collection system.
hydraulic cleaning
Cleaning pipe with water under enough pressure to produce high water velocities. Methods include using a high-velocity cleaner, using a kite or similar pipe-cleaning device, or using a scooter.
