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
pass-through
The passage of untreated pollutants through a publicly owned treatment works (POTW), which could violate applicable water quality standards or National Pollutant Discharge Elimination System (NPDES) effluent limitations.
equivalence point
The point on a titration curve where the acid ion concentration is equal to the base ion concentration.
screen
A device used to retain or remove suspended or floating objects in wastewater. The screen has openings that are generally uniform in size. It retains or removes objects larger than the openings. A screen may consist of bars, rods, wires, gratings, wire mesh, or perforated plates.
parachute
A device for hydraulically cleaning wastewater collection lines. Resembling an airport windsock and constructed of canvas-type material, the parachute increases the velocity of a flow at its outlet to wash debris ahead of it. Also called a kite.
signal word
A single word used to indicate the relative level of severity of a chemical hazard and to alert the reader to a potential hazard on the label. The signal words are “danger” (used for the more severe hazards) and “warning” (used for less severe hazards).
