been used for cooking or frying. UCOs are usually found in the food
processing industry such as restaurants and fast foods, as well as in
households. Table of contents. Used Cooking Oil can often be found from
deep-fry food stalls. UCOs are oils and fats that have been used for
cooking or frying in the food processing industry, restaurants, fast
foods and at consumer level, in households. The European Waste Catalogue
(EWC) classifies them as Municipal Wastes (household waste and similar
commercial, industrial and institutional wastes) including separately
collected fractions, under the code 20 01 25 (edible oils and fats). UCO
obtained from waste water treatment plants is also considered
non-hazardous materials with a different code: 19 08 09 (grease and oil
mixture from oil/water separation containing edible oil and fats).