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
reaeration (RE-air-A-shun)
The introduction of air through forced air diffusers into the lower layers of the reservoir. As the air bubbles form and rise through the water, oxygen from the air dissolves into the water and replenishes the dissolved oxygen (DO). The rising bubbles also cause the lower waters to rise to the surface where oxygen from the atmosphere is transferred to the water. Also called surface reaeration.
molecule
The smallest division of a compound that still retains or exhibits all the properties of the substance.
megger
(from megohm) An instrument used for checking the insulation resistance on motors, feeders, bus bar systems, grounds, and branch circuit wiring. A megger reads in millions of ohms. Also see meg.
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.
pan test
The pan test measures how uniformly wastewater is being distributed over the media of a trickling filter. Place pans at different locations on the filter surface. After a period of time, measure the water in each pan using a graduated cylinder or similar device. Each pan will have a similar amount of water if the wastewater is evenly distributed over the trickling filter.
