Glossary of Water and Wastewater Terms

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5 random terms from our glossary

struvite (STREW-vite)

A deposit or precipitate of magnesium ammonium phosphate hexahydrate found on the rotating components of centrifuges and centrate discharge lines. Struvite can be formed when anaerobic sludge comes in contact with spinning centrifuge components rich in oxygen in the presence of microbial activity. Struvite can also be formed in digested sludge lines and valves in the presence of oxygen and microbial activity. Struvite can form when the pH level is between 5 and 9.

draft

Drawing or removing water from a tank or reservoir or the water drawn or removed from a tank or reservoir.

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.

commercial television quality

Picture quality that is close to the level of a television picture. Commercial television pictures are considered to have resolutions between 350 and 525 lines. This is higher quality than surveillance quality and lower quality than inspection quality pictures.

discrete control

ON/OFF control; one of the two output values is equal to zero.