Real-Scale Integral Valorization of Waste Orange Peel via Hydrodynamic Cavitation | doi.page

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Real-Scale Integral Valorization of Waste Orange Peel via Hydrodynamic Cavitation

Processes2019Vol. 7(9), pp. 581–581

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Francesco Meneguzzo, Cecilia Brunetti, Alexandra Fidalgo, Rosaria Ciriminna, Riccardo Delisi, Lorenzo Albanese, Federica Zabini, Antonella Gori, Luana Beatriz dos Santos Nascimento, Anna De Carlo, Francesco Ferrini, Laura M. Ilharco, Mario Pagliaro

Abstract

Waste orange peel represents a heavy burden for the orange juice industry, estimated in several million tons per year worldwide; nevertheless, this by-product is endowed with valuable bioactive compounds, such as pectin, polyphenols, and terpenes. The potential value of the waste orange peel has stimulated the search for extraction processes, alternative or complementary to landfilling or to the integral energy conversion. This study introduces controlled hydrodynamic cavitation as a new route to the integral valorization of this by-product, based on simple equipment, speed, effectiveness and efficiency, scalability, and compliance with green extraction principles. Waste orange peel, in batches of several kg, was processed in more than 100 L of water, without any other raw materials, in a device comprising a Venturi-shaped cavitation reactor. The extractions of pectin (with a remarkably low degree of esterification), polyphenols (flavanones and hydroxycinnamic acid derivatives), and terpenes (mainly d-limonene) were effective and efficient (high yields within a few min of process time). The biomethane generation potential of the process residues was determined. The achieved results proved the viability of the proposed route to the integral valorization of waste orange peel, though wide margins exist for further improvements.

Citations Over TimeTop 1% of 2019 papers

Abstract

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