Title:
Potential of Gulupa (Purple Passion Fruit) Waste for Biorefineries
Author(s):
Durán-Aranguren, D., Bernal-Álvarez, L., Morantes, G., Sierra, R.
Document(s):
Paper
Poster
Abstract:
Food waste in the form of fruit residue is an issue of global importance with a scarce and short-sighted supply of viable solutions. In Colombia alone, approximately 12 million tons of food waste produced annually, most of which accumulates and overflows in landfills, producing a plethora of undesirable materials and effects. Taken this into account, the peels of the Passiflora edulis f. edulis(or gulupa, as it is colloquially known) were studied for its use in a biorefinery. The Passiflora edulis f. edulis, a member of the Passiflora family (akin to the P. edulis f. flavicarpa, or the passionfruit), is a tropical fruit common to the Colombian cordillera. In the first place, a compositional analysis was done in order to thoroughly characterize the content of the peel using NREL protocols for measuring total solids, extractives, cellulose, hemicellulose, lignin, ash and pectin. Due to its rich composition, the gulupa peel could be used as a source of pectin, dyes, and biomass for biogas production. The biogas, a fuel composed primarily of the greenhouse gas methane, was collected in a set of bioreactors which were employed using a modified version of the VDI4630 protocol. This analysis involved carrying out an experimental design in which one predominant component of the fruit’s peel, the pectin, was taken as a variable: biogas production from the peels with and without this compound was analysed. A central composite design was used with three continuous variables each having two levels: pH, time and extraction temperature, to evaluate % pectin recuperation using citric acid. On the other hand, ethanol extraction was employed to retrieve the pigments that the fruit contained, and they were identified qualitatively. Regarding biogas production, peels that did not contain pectin produced significantly less methane ~100 ml CH4/gVS than the ones with no extraction, mainly due to the absorption of CO2 into the solid matrix. Results of the experimental design demonstrate that conditions that maximize pectin recovery are 1.5 pH, 90., and 120 min. Nonetheless, with a maximum recovery of pectin of 32% and a minimum recovery of pectin around 28% it is possible to operate in other conditions that reduce process time and energy consumption.It is worth to consider the possibility for industrial production of pectin. From the qualitative analysis of the ethanol extracted solutions from gulupa peel it was found presence of chalcones, aurones, leucoanthocyanidins, tannins, saponins, alkaloids, sterols, naphthoquinones, and antroquinones. The gulupa waste biorefinery, is self-sustainable material driven biorefinery with the possibility to be implemented in producing countries.
Keywords:
biogas, biorefinery, lignocellulosic sources, bioproducts, pectin, dyes
Topic:
Biomass Conversion Technologies for Energy Carriers, Chemicals and Materials
Subtopic:
Biorefineries
Event:
27th European Biomass Conference and Exhibition
Session:
3CV.5.10
Pages:
1303 - 1309
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-3CV.5.10
Price:
FREE
