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
parallel operation
Wastewater being treated is split and a portion flows to one treatment unit while the remainder flows to another similar treatment unit. Also see series operation.
normality
The number of gram-equivalent weights of solute in 1 liter of solution. The equivalent weight of any material is the weight that would react with or be produced by the reaction of 8.0 grams (g) of oxygen or 1.0 g of hydrogen. Normality is used for certain calculations of quantitative analysis. Also see N.
combined available chlorine
The total chlorine, present as chloramine or other derivatives, that is present in a water and is still available for disinfection and for oxidation of organic matter. The combined chlorine compounds are more stable than free chlorine forms, but they are somewhat slower in disinfection action.
Occupational Safety and Health Administration
See OSHA.
stop log
A log or board in an outlet box or device used to control the water level in lagoons and the flow from one lagoon to another lagoon or system.
