Costs food waste valorization

The author and colleagues have already written a revision on the valorization processes for waste cooking or frying oils (WFO) (Pinzi et al., 2014). Nevertheless, they deserve a special mention in this section due to its high quantity (15 million tons per year), easy availability and low-cost transformation methods (Lopresto et al., 2015). The conversion of all available WFO into biodiesel would cover the world demand for biofuels, increasing production sustainability, eliminating a harmful waste from the environment and overcoming the competition with food markets. 

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