The Effect of Combined Formulation from Natural and Synthetic Antioxidants Derived from Sewage of Olive Oil Mill in Order to Improve the Oxidative Stability of Sunflower Biodiesel

The olive oil extraction industry generates large amounts of two by-products solid residue and an effluent known as olive mill wastewater that is currently considered olive mill waste. However, they have a great potential to be used as preservatives (single or combined with synthetic ones) of Biodiesel. Biodiesel is an alternative diesel fuel obtained by transesterification of vegetable fats and oils, using alcohol in the presence of a catalyst, but its drawback is of being more prone to oxidation than petroleum-based diesel fuel, can cause the fuel to become acidic and form insoluble gums and sediments and consequently increase its viscosity In this study, in order to increase the stability of biodiesel-based sunflower high oleic acid against the oxidation process during storage and distribution of water after extraction, we added 100 ppm of halo and 200 ppm of antioxidants (BHT + USM) together. Evaluate the effect of synthetic BHT antioxidants. The oxidative stability of biodiesel will determine using the Rancimat method to evaluate. the greater efficiency of the best combination used gas chromatography.