Glossary of Water and Wastewater Terms

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5 random terms from our glossary

Planning

Management of utilities to build the resources and financial capability to provide for future needs.

Reject (REE-ject)

For a pressure-driven membrane process, the portion of feed solution that does not pass through the membrane. Also called retentate.

Cone of Influence

The depression, roughly conical in shape, produced in the water table by the pumping of water from a well. Also called the cone of depression. Also see CIRCLE OF INFLUENCE.

Chromium

A hard, brittle, metallic element often used in metal alloys and as a corrosion-resistant surface coating for metal parts. Chromium is an especially toxic metal, with hexavalent chromium being appreciably more toxic than trivalent chromium. Inadequate or improper handling and disposal of chromium may create serious environmental hazards. Also see CHROME PLATE, HEXAVALENT CHROMIUM, and TRIVALENT CHROMIUM.

Superchlorination (SOO-per-KLOR-uh-NAY-shun)

Chlorination with doses that are deliberately selected to produce free or combined residuals so large as to require dechlorination.