Results identify important tools for the qualification and quantification of the effects of coffee waste properties on energy production processes. After a careful evaluation of the possible uses of coffee grounds, the aim of this research was to show a broad characterization of coffee waste for energy purposes through physical and chemical analyses that highlight the most significant quality indexes, the interactions between them and the quantification of their importance. Indeed, thanks to their composition, they can be used in the production of biodiesel, as a source of sugar, as a precursor for the creation of active carbon or as a sorbent for the removal of metals. The many organic compounds contained in coffee residues suggest that their recovery and use could be very beneficial. Silver skin and spent coffee grounds (SCG) are the main residues of the coffee industry. Among the main types of agro-industrial waste, soluble coffee residues represent a significant quantity all over the world. Every year, a large amount of agro-industrial, municipal and forest residues are treated as waste, but they can be recovered and used to produce thermal and electrical energy through biological or thermochemical conversion processes. Thus, environmental pollution has become a profound problem. Industrial development and increased energy requirements have led to high consumption of fossil fuels.
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