and fats used for the production of biodiesel (including edible and inedible, animal fats and cooking oils). After this, transesterification is necessary, a technique that transforms fatty acids into a compound called alkyl, that is, biodiesel. Oils are triglycerides made up of three fatty acid chains linked by a glycerin molecule. In the process, the conversion of these triglycerides is carried out using a catalyst, such as bleach, and an alcohol, such as methanol, which replaces glycerin. After a reaction at constant temperature, by decantation or by centrifugation, biodiesel is obtained. In the study, a first conventional transesterification was carried out and, in parallel, the reaction parameters were optimized in a second phase using ultrasound.

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This technique is more sustainable than the Bahamas Phone Number List conventional one since it requires less catalyst, usually highly polluting. In addition, ultrasound is faster, which reduces the energy consumption required for the transformation. The use of biofuels has advanced notably in recent years. However, 95% of biodiesel feedstock comes from edible crops such as palm, soy, and rapeseed oil. This means that an exclusive industry for the production of vegetable fuels has been developed that could negatively affect the food supply chain and the environmental balance due to the intensive use of the soil. For this reason, the scientific community is exploring other alternative ways to obtain oils from non-edible products. Thus, the experts observed the possibility of reusing

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organic waste from food for the extraction of fats that would allow its transformation into vegetable fuels. In this way, they achieve a double objective; recycle waste and achieve a sustainable product. The study has been carried out through the project ‘Biorefinery design through the recovery of waste from the food sector’ of the Ministry of Economy and Business and the Interreg contract for cross-border cooperation between Spain and Portugal, ‘POCTEP’. microalgae Chlorella sorokiniana under different trophic conditions with the traditional higher cost carbon sources, such as glucose or sucrose, and alternative low-cost carbon sources, coming from carob, wine or biodiesel residues, rich in acetate and glycerol ”, he adds. Thus, taking advantage of the

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