A physicochemical-biotechnological approach for an integrated valorization of olive mill wastewater |
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Authors: | Scoma Alberto Bertin Lorenzo Zanaroli Giulio Fraraccio Serena Fava Fabio |
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Institution: | Department of Civil, Environmental and Materials Engineering (DICAM), Unit of Environmental Biotechnology and Biorefineries, Faculty of Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy. alberto.scoma2@unibo.it |
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Abstract: | An integrated physicochemical-biotechnological approach for a multipurpose valorization of olive mill wastewaters was studied. More than 60% of the wastewater natural polyphenols were recovered through a solid phase extraction procedure, by employing Amberlite XAD16 resin as the adsorbent and ethanol as the biocompatible desorbing phase. Thereafter, the dephenolized effluent was fed to a mesophilic anaerobic acidogenic packed-bed biofilm reactor for the bioconversion of the organic leftover into volatile fatty acids (VFAs). A VFAs concentration of 19 gCODL(-1) was obtained, representing more than 70% of the COD occurring in the anaerobic effluent. The biotechnological process was assessed by means of bio-molecular analyses, which showed that the reactor packed bed was mostly colonized by bacteria of the Firmicutes phylogenetic group. The biorefinery scheme developed in this study allowed the obtainment of 1.59 g of polyphenols per liter of wastewater treated and 2.72 gCODL(-1) day(-1) of VFAs. |
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Keywords: | Polyphenols Volatile fatty acids Packed bed biofilm reactor Vukopor DGGE |
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