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
saddle connection
A building service connection made to a wastewater collection main with a device called a saddle.
job safety analysis (JSA)
An examination process to identify potential hazards or problems associated with a job or task to determine how to prevent accidents and injuries. A supervisor selects the job to be analyzed and then, with the help of the inspectors, the job is subdivided into individual steps and each step of the job is critically examined.
NOM
See natural organic matter.
MCL
See maximum containment level (MCL).population equivalent
A means of expressing the strength of organic material in wastewater. In a domestic wastewater system, microorganisms use up about 0.2 pound (90 grams) of oxygen per day for each person using the system (as measured by the standard BOD test). May also be expressed as flow (100 gallons/person/day or 378 liters/person/day) or suspended solids (0.2 lb SS/person/day or 90 grams SS/person/day).
population equivalent [persons] = flow rate [m gal/d] x BOD [mg/L] x 8.34 [b/gal] / 0.2 [b/person . d] BOD
or
population equivalent [person] = flow rate [m3/d] x BOD [mg/L] x 10 [L/m3] / 90,000 [mg/person . d] BOD
