Purification of olive mill wastewater phenols through membrane filtration and resin adsorption/desorption

On the Purification of Agro-Industrial Wastewater by Membrane Technologies: The Case of Olive Mill Effluents

“…Zagklis et al [66] tested the fractionation of OMW-3 exiting a previous membrane process comprising NF and RO by a three-step resin process. The nonionic XAD4, XAD16, and XAD7HP resins were selected.…”

Comparison between different liquid-liquid and solid phase methods of extraction prior to the identification of the phenolic fraction present in olive oil washing wastewater from the two-phase olive oil extraction system

“…On the other hand, for the recovery of these valuable phenolic compounds on an industrial scale, La Scalia et al (2017) tested membrane filtration and reverse osmosis processes, whereas Zagklis et al (2015) used filtration though membranes followed by resin adsorption/desorption, and vacuum distillation for the final concentration of phenols. Zafra et al (2006) only used a liquid-liquid micro-extraction with ethyl acetate, and Elkacmi et al (2017), after OMW delipidation with hexane, also extracted the phenolic compounds with ethyl acetate.…”

“…A particularity in this study has been the utilization of OMW generated by the two-phase olive oil system, which is a more recent process which involves a reduction in wastewater volume but an increased concentration in organic matter in comparison with the OMW obtained in the three-phase process (Borja et al 2006) whose samples have been used in other works (Allouche et al, 2004;De Marco et al, 2007;Zagklis et al, 2015). Moreover, OOWW from vertical centrifuge machines generated by the two-phase olive oil extraction system and wastewater derived from the washing of the olives were used in this work, in comparison with other studies where phenolic compounds have been identified in OMW in general, consisting of a mixture of washing oil wastewater, olive washing wastewater and other residues generated in the oil industry.…”

Use of solar distillation for olive mill wastewater drying and recovery of polyphenolic compounds

“…During the last years, several articles have been published, suggesting methods for the recovery of these compounds from OMW. The applied methods include adsorption onto resins and other sorbent materials, solvent extraction, supercritical fluid extraction, selective concentration by ultrafiltration and other membrane systems (Galanakis et al, 2010;El-Abbassi et al, 2011;Scoma et al, 2011;Ena et al, 2012;Kalogerakis et al, 2013;Rahmanian et al, 2014;Zagklis et al, 2015). The main weaknesses of these methods that hamper their implementation in full-scale are the requirement for OMW pretreatment in order to reduce significantly solids concentration, as well as their high cost either due to the use of chemicals for pre-concentration and/or extraction of target compounds or due to the significant energy requirements.…”