Abbreviations

The following is NOT a list of ALL the abbreviations used in the field of wastewater treatment.  It is however a list of some the more common abbreviations that may be encountered on a wastewater exam.  Many of these are explained in detail on the Definitions page.

  • AOR -Actual Oxygen Requirement
  • BOD – Biochemical Oxygen Demand
  • BTU – British Thermal Units
  • COD – Chemical Oxygen Demand
  • CRT – Cathode Ray Tube
  • DAF – Dissolved Air Flotation
  • DO – Dissolved Oxygen
  • F/M – Food to Microorganism ratio
  • HTH – High Test Hypochlorite
  • LPG – Liquefied Petroleum Gas
  • MCC – Motor Control Center
  • MCRT – Mean Cell Retention Time
  • MGD – Million Gallons per Day
  • MLSS – Mixed Liquor Suspended Solids
  • MLVSS – Mixed Liquor Volatile Suspended Solids
  • MPN – Most Probable Number (of coliform organisms)
  • NEC – National Electric Code
  • NPSH – Net positive Suction Head
  • ORP- Oxidation Reduction Potential
  • OSHA – Occupational Safety and Health Act
  • PCB’s – Polychlorinated Biphenyls
  • PSA – Pressure Swing Adsorption (oxygen generation)
  • RAS – Return Activated Sludge
  • RBC’s – Rotating Biological Contactors
  • SCR – Silicon Control Rectifier
  • SOR – Standard Oxygen Requirement
  • SOUR – Specific Oxygen Uptake Rate
  • SVI – Sludge Volume Index
  • SRT – Solids Retention Time (same as MCRT)
  • SS – Suspended Solids (same as TSS)
  • TKN – Total Kjeldhal Nitrogen
  • TOC – Total Organic Carbon
  • TS – Total Solids
  • TSS – Total Suspended Solids (same as SS)
  • USEPA – United States Environmental Protection Agency
  • VS – Volatile Solids
  • VSS – Volatile Suspended Solids
  • WAS – Waste Activated Sludge
  • WPCF – Water Pollution Control Federation
  • cu ft – cubic feet
  • deg – degrees
  • gal – gallon
  • gpd – gallons per day
  • hp – horsepower
  • lbs – pounds
  • kw – kilowatt
  • kwH – kilowatt-hour
  • mg/l – milligrams per liter
  • ppm – parts per million
  • psi – pounds per square inch
  • rpm – revolutions per minute
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