Glossary of Water and Wastewater Terms

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5 random terms from our glossary

Water Table Head


Grease Trap

A receptacle designed to collect and retain grease and fatty substances usually found in kitchen wastes or similar wastes. It is installed in the drainage system between the kitchen or other point of production of the waste and the building wastewater collection line. Commonly used to control grease from restaurants.


  1. A written promise to pay a specified sum of money (called the face value) at a fixed time in the future (called the date of maturity). A bond also carries interest at a fixed rate, payable periodically. The difference between a note and a bond is that a bond usually runs for a longer period of time and requires greater formality. Utility agencies use bonds as a means of obtaining large amounts of money for capital improvements.
  2. A warranty by an underwriting organization, such as an insurance company, guaranteeing honesty, performance, or payment by a contractor.

Fulvic Acid

A complex organic compound that can be derived either from soil or water. Aquatic fulvic acids are major precursors of disinfection by-products.

Microfiltration (MF)

A pressure-driven membrane filtration process that separates particles down to approximately 0.1 μm diameter from influent water using a sieving process.