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
thermophilic bacteria (thur-moe-FILL-ick)
A group of bacteria that grow and thrive in temperatures above 113°F (45°C). The optimum temperature range for these bacteria in anaerobic decomposition is 120°F (49°C) to 135°F (57°C). Aerobic thermophilic bacteria thrive between 120°F (49°C) and 158°F (70°C).
exothermic (EX-o-THUR-mick)
Releasing heat due to a process or reaction. For example, aerobic digesters are exothermic because the biological activity occuring in the basin releases heat.
upper explosive limit (UEL)
The highest concentration of a gas or vapor (percentage by volume in air) above which a flame will not spread in the presence of an ignition source (arc, flame, or heat). Concentrations higher than UEL are “too rich” to burn. Also called upper flammable limit (UFL). Also see lower explosive limit.
cardiopulmonary resuscitation (CPR)
An emergency procedure for a person whose heart has stopped or is no longer breathing.
chemical precipitation
- Precipitation induced by the addition of chemicals.
- The process of softening water by the addition of lime or lime and soda ash as the precipitants.
