Wastewater Treatment: Guidance Notes on Grease Management

Fats and oils found in wastewater are commonly referred to as FOG (Fats, Oils and Greases).  FOG may be derived from butter, lard, vegetable fats, oils, meats, nuts and cereals and are generated in large quantities in food businesses.

  • FOG causes problems because it does not break down easily and solidifies at lower temperatures. 
  • FOG entering the sewerage system results in accumulation and blockages in pipes and equipment which results in increases in the time and money required to treat the waste at the wastewater treatment plant.
  • All food businesses (including factories with certain types of canteen facilities) must install and maintain grease traps to prevent the FOG entering the sewer system. 
  • The main aim of the grease trap is to separate the grease from the rest of the wastewater. 

Limerick County Council have produced a guidance note on grease management to assist businesses address FOG.
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