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Waste Manag

Title:		Valorization of strawberry extrudate waste: Recovery of phenolic compounds by direct-hydrothermal treatment and subsequent methane production by mesophilic semi-continuous anaerobic digestion
Author(s):		Cubero-Cardoso J; Jimenez-Paez E; Trujillo-Reyes A; Serrano A; Urbano J; Rodriguez-Gutierrez G; Borja R; Fermoso FG;
Address:		"Instituto de Grasa, Spanish National Research Council (CSIC). Campus Universidad Pablo de Olavide, Building 46. Ctra. de Utrera, km. 1, 41013 Seville, Spain; Laboratory of Sustainable and Circular Technology. CIDERTA and Chemistry Department, Faculty of Experimental Sciences. Campus de 'El Carmen', University of Huelva, 21071 Huelva, Spain. Electronic address: j.cubero@dqcm.uhu.es. Instituto de Grasa, Spanish National Research Council (CSIC). Campus Universidad Pablo de Olavide, Building 46. Ctra. de Utrera, km. 1, 41013 Seville, Spain; Institute of Water Research, University of Granada, 18071 Granada, Spain. Instituto de Grasa, Spanish National Research Council (CSIC). Campus Universidad Pablo de Olavide, Building 46. Ctra. de Utrera, km. 1, 41013 Seville, Spain. Institute of Water Research, University of Granada, 18071 Granada, Spain; Department of Microbiology, Pharmacy Faculty, University of Granada, Campus de Cartuja s/n, 18071 Granada, Spain. Laboratory of Sustainable and Circular Technology. CIDERTA and Chemistry Department, Faculty of Experimental Sciences. Campus de 'El Carmen', University of Huelva, 21071 Huelva, Spain. Instituto de Grasa, Spanish National Research Council (CSIC). Campus Universidad Pablo de Olavide, Building 46. Ctra. de Utrera, km. 1, 41013 Seville, Spain. Electronic address: fgfermoso@ig.csic.es"
Journal Title:		Waste Manag
Year:		2023
Volume:		20230725
Issue:
Page Number:		310 - 318
DOI:		10.1016/j.wasman.2023.07.016
ISSN/ISBN:		1879-2456 (Electronic) 0956-053X (Linking)
Abstract:		"Strawberry extrudate (SE) is an underused by-product from strawberry industry. Recovery of the phenolic compounds present in SE would represent a very interesting valorisation option. Two main challenges need to be solved, firstly, the solubilisation and recovery of the phenolic compounds contained in SE, and, after that, the stabilisation of the resulted de-phenolized SE. The present research evaluates the potential of a biorefinery process combining a hydrothermal pre-treatment, followed by a phenolic extraction process and, finally, the anaerobic digestion of the remaining SE for producing energy that will contribute to compensate the energy requirements of the whole system. Following the hydrothermal pre-treatment at 170 degrees C for 60 min, an extraction of 0.6 +/- 0.1 g of gallic acid per kilogram of SE was achieved using an adsorbent resin, representing a recovery rate of 64 %. Long-term semi-continuous anaerobic digestion of de-phenolized SE was evaluated at different organic loading rates to evaluate the stability of the process. The anaerobic digestion of pre-treated SE achieved a stable methane production value of 243 +/- 34 mL CH(4).g volatile solids(-1).d(-1) at an organic loading rate (ORL) of 1.25 g volatile solids.L(-1).d(-1). During the operation at this ORL, the control parameters including pH, alkalinity, soluble chemical organic demand (sCOD), and volatile fatty acid (VFA) remained stable and consistently constant. Specifically, the VFA in the reactor during this stable period achieved a value of 102 +/- 128 mg O2/L. Also, an economic balance showed that the minimal price of the generated phenolic extract for having benefited from the proposed biorefinery system was 0.812 euro.(g of gallic acid equivalents)(-1), a price within the range of phenolic compounds used in the food industry"
Keywords:		Anaerobiosis *Fragaria Bioreactors Methane Agro-waste Biorefinery Economic assessment Hydrothermal pre-treatment Phenolic compounds recovery;
Notes:		"MedlineCubero-Cardoso, Juan Jimenez-Paez, Elena Trujillo-Reyes, Angeles Serrano, Antonio Urbano, Juan Rodriguez-Gutierrez, Guillermo Borja, Rafael Fermoso, Fernando G eng 2023/07/28 Waste Manag. 2023 Sep 1; 169:310-318. doi: 10.1016/j.wasman.2023.07.016. Epub 2023 Jul 25"