Valorisation of olive mill wastewater by phenolic compounds adsorption: development and application of a procedure for adsorbent selection

Frascari, Dario and Rubertelli, Giorgia and Arous, Fatma and Ragini, Alessandro and Bresciani, Letizia and Arzu, Antonio and Pinelli, Davide (2018) Valorisation of olive mill wastewater by phenolic compounds adsorption: development and application of a procedure for adsorbent selection. [Preprint]
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A procedure for the selection of the optimal adsorbent for phenolic compounds (PC) recovery from PC-rich wastes and wastewaters was innovatively proposed and applied to compare 4 neutral resins (Amberlite XAD16N, Optipore SD-2, Amberlite FPX66, Amberlite XAD761) and 1 ion-exchange resin (Amberlite IRA958 Cl) for PC recovery from a Tunisian olive mill wastewater (OMW). In the initial batch isotherm tests a neutral resin (XAD16N) performed best thanks to its high PC sorption capacity (81 mgPC/gdry resin) and PC content in the sorbed product (0.19 gPC/gvolatile solids). Also ion-exchange resin IRA958, used in OH form in this work, resulted interesting thanks to its satisfactory performances and very low cost (8 €/L). These two pre-selected resins were further compared by means of continuous-flow adsorption/desorption tests conducted in a 1-m packed column. The results indicate that if a low (20%) breakpoint is selected, XAD16N leads to a PC-richer sorbed product (0.14 gPC/gvolatile solids) and a higher operating capacity (0.30) than IRA958. Conversely, if a very high (90%) breakpoint is selected, the two resins produce similar desorbed products in terms of both PC content (0.19-0.21 gPC/gvolatile solids) and antioxidant capacity (4.6-4.9 gascorbic acid equivalent/gPC). Resin-specific dynamic desorption procedures led to very high PC desorption yields (87-95%). The identification of the actual PCs present in the final desorbed product indicated for XAD16N a higher capacity to preserve the integrity of the PC mixture of the studied OMW. OMW microfiltration (0.2 μm pore-size) led to a 99.8% suspended solid removal - thus protecting the packed column from potential clogging - with a very low PC loss.

Document type
Frascari, DarioUniversity of Bologna0000-0001-9258-8208
Rubertelli, GiorgiaUniversity of Bologna
Arous, FatmaUniversité de Tunis El Manar
Ragini, AlessandroUniversity of Bologna
Bresciani, LetiziaUniversity of Parma
Arzu, AntonioDOW Italia
Pinelli, DavideUniversity of Bologna
phenolic compounds; adsorption; ion exchange; resin selection; antioxidant activity; olive mill wastewater
Deposit date
12 Dec 2018 13:29
Last modified
23 May 2019 09:46
Project name
MADFORWATER - DevelopMent AnD application of integrated technological and management solutions FOR wasteWATER treatment and efficient reuse in agriculture tailored to the needs of Mediterranean African Countries
Funding program
EC - H2020

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