Title:
A Biorefinery for the Valorization of Orange Residues
Author(s):
Echeverri, A., Forero-Rojas, L.F., Durán-Aranguren, D. , Carazzone, C., Sierra, R.
Document(s):
Paper
Slide presentation
Abstract:
Large amounts of orange residues (peels, seeds, and leftover pulp) are discarded by an orange juice shop within the campus of Universidad de los Andes. These residues contain valuable substances that can be extracted and also, they can be used to produce biofuels by biotechnological routes. This project evaluates the valorization of orange residues by taking advantage of each one of its components and transforming them into useful products. The purpose of this work was first to characterize this residue using standard NREL procedures. After that, the production of biogas was evaluated using the Biological Methane Potential (BMP) test, and the production of ethanol using Saccharomyces bayanus. Essential oils and pectin were extracted in order to evaluate its influence on the yields of methane and ethanol from orange residues. Compositional analysis showed that orange waste contains considerable amounts of hemicellulose (28.0 ± 0.77%), pectin (26.4 ± 0.35%), and extractives (18.7 ± 0.58%). The maximum methane production was obtained using the untreated residue (291 ± 2.7 mL CH4/gVS), which produced 4.5 times more methane than the inoculum alone. Untreated samples of orange waste produced at least 50 mL CH4/gVS more than samples without pectin and without oil. A decrease of 100 mL CH4/gVS was found when oil and pectin were removed at the same time in comparison with the non-treated sample. The experimental results were successfully adjusted to the first-order and modified Gompertz models, with adjustment coefficients higher than 88% in all cases. The production of ethanol and glycerol is enhanced due to the presence of essential oils and pectin in comparison to the other conditions. A maximum concentration of 43.9 ± 5.5 mg/L of ethanol and 1.8 ± 0.08 mg/L of glycerol were obtained using the untreated residue. Main phytochemical substances were identified in the extracts showing the possibility to produce biogas and bioethanol in conjunction with the retrieval of oils, terpenes and polyphenols.
Keywords:
bioethanol, biogas, composition, pectin, orange residues, bioactive compounds
Topic:
Biomass Conversion to Intermediate Bioenergy Carriers, Sustainable Biofuels and Bio-Based Products
Subtopic:
Biorefineries
Event:
29th European Biomass Conference and Exhibition
Session:
3BO.9.2
Pages:
733 - 739
ISBN:
978-88-89407-21-9
Paper DOI:
10.5071/29thEUBCE2021-3BO.9.2
Price:
FREE
