Used cooking oil (UCO) is a by-product of the food industry that is made up of oils and fats that have been used for cooking, frying, or preserving food: CompositionUCO is a mixture of triglycerides, diglycerides, monoglycerides, and free fatty acids. The composition of UCO depends on the type of oil used and the chemical changes that occur during food preparation. SourcesUCO can come from households, restaurants, or food industry factories. It can also include waste from using cooking oil to lubricate food processing machinery. BenefitsUCO can be reused in many ways, including:Renewable fuels: UCO can be refined into renewable fuels that can replace fossil fuels. Raw materials: UCO can be used to produce raw materials for polymers and chemicals, which can be used to make bio-based plastics. Household items: UCO can be used to make soaps, beauty products, pet food, and lamp oil.