Glossary of Water and Wastewater Terms

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5 random terms from our glossary

fulvic acid

A complex organic compound that can be derived either from soil or water. Aquatic fulvic acids are major precursors of disinfection byproducts.

plug flow

A type of flow that occurs in tanks, basins, or reactors when a slug of water or wastewater moves through a tank without dispersing or mixing with the rest of the water or wastewater flowing through the tank.

discrete I/O (input/output)

A digital signal that senses or sends either ON or OFF signals. For example, a discrete input would sense the position of a switch; a discrete output would turn on a pump or light.

milligrams per liter (mg/L)

A measure of the concentration by weight of a substance per unit volume in water or wastewater. In reporting the results of water and wastewater analysis, mg/L is preferred to the unit parts per million (ppm), to which it is approximately equivalent.

compound

A substance composed of two or more elements whose proportions are constant. For example, table salt (sodium chloride, NaCl) is a compound.