Briquettes of citrus peel and rice husk
2020
Magnago, Rachel Faverzani | Costa, Susana Claudete | Assunção Ezirio, Maria Julia de | Godoy Saciloto, Vitoria de | Cremona Parma, Gabriel Oscar | Gasparotto, Emerson Silveira | Gonçalves, Affonso Celso | Tutida, Alessandra Yula | Barcelos, Ricardo Luis
Agro-industrial waste is among the most abundant and accessible sources of biomass for conversion to solid biofuel, but sustainable bioenergy must be highly efficient. Therefore, the high and low heating value of briquettes produced from citrus peels (pear orange, ponkan tangerine, tahiti lemon), rice and yellow potato was evaluated, both from conventional and organic cultivation. For this, apparent density, total moisture and ash content of twelve compositions were determined. Compressive strength and smoke density using Ringelmann scale were also determined. In addition, the amount of nutrients (N, P, K, Ca and Mg) and heavy metals (Cu, Zn, Fe, Mn, Pb and Al) from the ashes of five samples were measured by FAAS. The high heating value of the specimens varied between 14.6 and 17.2 MJ/kg and low heating value between 13.1 and 15.8 MJ/kg, with the wood between 7.12 and 10.47 MJ/kg, and all samples presented suitable maximum resistance for the storage and handling of solid biofuel for domestic use. Although the nutrients are present in the samples, it was observed that the biomasses of organic cultivation had higher nitrogen content, and the values of Cu, Zn, Fe, Pb and Al were lower in the samples, and in other nutrients variations in quantities occurred. The smoke density for solid biofuel with biomass from organic cultivation was lower than those found in specimens from conventional cultivation. All the briquettes developed showed capability to replace traditional sources of heat.
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