Wastewater glossary
Terms explained with numbers from the facility database.
WWTP
Wastewater Treatment Plant
Biosolids
Treated sewage sludge
Filter press
Plate-and-frame and belt filter presses for sludge dewatering
FOG
Fats, oils and grease
Equalization tank
Flow equalization basin
Centrate
Liquid separated from sludge in a centrifuge
Ozonation
Ozone disinfection and oxidation
Activated sludge
Suspended-growth biological treatment
Oxidation ditch
Ring-shaped extended-aeration activated sludge reactor
Anaerobic digester
Sludge stabilisation with biogas recovery
NPDES permit
National Pollutant Discharge Elimination System