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
free available chlorine residual
The amount of chlorine available at the end of a specified contact period in chlorinated water or wastewater. This residual may be in the form of dissolved gas (Cl2), hypochlorous acid (HOCl), or hypochlorite ion (OCl–), but does not include chlorine combined with an amine (ammonia or nitrogen) or other organic compound.
yield
The quantity of water (expressed as a rate of flow—gallons per minute, hour, or day; cubic meters per day; millions of liters per day, or total quantity per year) that can be collected for a given use from surface or groundwater sources. The yield may vary with the use proposed, with the plan of development, and also with economic considerations. Also see safe yield.
analyzer
A device that conducts a periodic or continuous measurement of turbidity or some factor such as chlorine or fluoride concentration. Analyzers operate by any of several methods, including photocells, conductivity, or complex instrumentation.
waste activated sludge (WAS)
The excess quantity (mg/L) of microorganisms that must be removed from the process to keep the biological system in balance.
permeability (PURR-me-uh-BILL-uh-tee)
The property of a material or soil that permits considerable movement of water through it when it is saturated.
