NOVELTY - Obtaining fat and/or oil from industrial waste comprises: collecting industrial waste e.g. waste from effluent treatment industries; acidifying industrial waste by adding e.g. phosphoric acid, and heating; separating organic matter from fluids; extracting fat and fatty acids with non-polar solvent and subjecting to slow shaking; separating fat, fatty acids and solvent from remaining organic matter; heating the mixture including fat, fatty acids and solvent, and recovering solvent; putting non-fat organic matter and fatty acids into a pool with microalgae; and verifying acidity of the mixture.    USE - The process is useful for obtaining fat and/or oil from industrial waste, where the fat and/or oil are useful as raw materials for producing fuels (claimed).    ADVANTAGE - The process provides fat and/or oil by using raw materials which are not derived from oilseeds thus allowing arable land for the production of foodstuffs and making it unnecessary to deforest.    DETAILED DESCRIPTION - Obtaining fat and/or oil from industrial waste comprises: a prior stage comprising collecting industrial waste e.g. production waste, bad batches, sewage effluents from the dairy and meet-processing industry and waste from effluent treatment industries; a first stage comprising acidifying the industrial waste by adding either hydrochloric, sulfuric or phosphoric acid in an amount sufficient to cause the pH of the waste to reach 1.8-2.4, and heating the waste at 44-55 degrees C; a second stage comprising separating the most of organic matter from fluids by centrifuging at 1800-2500 rpm for 25-35 minutes; a third stage comprising extracting fat and fatty acids by adding a non-polar solvent, where the non-polar solvent is added at minimum of 20/80 and a maximum of 40/60, and subjecting the mixture to slow shaking for 25-35 minutes; a fourth stage comprising separating fat, fatty acids and solvent from the remaining organic matter by centrifuging at 1800-2200 rpm for 25-35 minutes; a fifth stage comprising heating the mixture including fat, fatty acids and solvent at 50-60 degrees C and at a pressure 180-200 mmHg for 50-75 minutes, and recovering the solvent by distillation; a sixth stage comprising putting the nonfat organic matter and the fatty acids into a pool with microalgae; and seventh stage comprising verifying the acidity of the mixture of fat and fatty acids resulting from distillation, and including, if applicable, transesterification, if acidity is lower than 2%, and prior esterification, if the acidity is higher than 2%.    DESCRIPTION OF DRAWING(S) - The figures shows a block diagram of the process for obtaining fat and/or oil from industrial waste.    Acidification (1)    Centrifugation (2)    Fat and fatty acid extraction (3)    Separation (4)    Distillation (5)