Separation and Purification of Polyphenols from Pericarpium Granati Using Macroporous Resins and Evaluation of its Anti-Streptococcus mutans Activity in vitro

BACKGROUND Olive mill wastewaters (OMWs) represent a major environmental concern due to their high organic load and phytotoxic activity. The selective recovery of phenolic compounds (PCs) from OMW is promising, thanks to the antioxidant and antimicrobial properties of PCs. The goal of this work was to perform a life cycle assessment (LCA) and cost–benefit analysis (CBA) of a full‐scale process of PC adsorption/desorption on resin Amberlite XAD16N. The industrial process was designed on the basis of laboratory tests aimed at performing a preliminary process optimization. RESULTS Adsorption tests were conducted at different velocities in a 1.8‐m column packed with XAD16N. The optimal superficial velocity and retention time (2.78 m h–1 and 0.56 h) allowed the attainment of satisfactory performances in terms of resin operating capacity (0.46), PC adsorption yield (0.92), PC mass fraction in the sorbed product (0.50 gPC/gVS) and specific antioxidant activity (3–6 gascorbic acid/gPC). Six consecutive adsorption/desorption cycles, operated with the same resin load, resulted in stable process performances. The LCA indicated that the environmental impact of the process could be decreased markedly through the addition of an anaerobic digestion step for the production of irrigation‐quality water and fertilizers from the dephenolized OMW. The PC market price required for the generation of a positive business case resulted relatively low (€1.7–13.5 kgPC–1). CONCLUSION The results indicate that the proposed PC adsorption/desorption technology, if integrated with an anaerobic digestion step, represents a promising solution for the treatment and valorization of OMW, a major agro‐industrial waste in Mediterranean countries. © 2019 Society of Chemical Industry

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Continuous flow adsorption of phenolic compounds from olive mill wastewater with resin XAD16N: life cycle assessment, cost–benefit analysis and process optimization

Frascari

Bacca

Wardenaar

et al. 2019

J of Chemical Tech & Biotech

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

Frascari

Rubertelli

Arous

et al. 2019

Chemical Engineering Journal

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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 ionexchange 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). Resinspecific 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.

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Adsorption technologies to recover and concentrate food polyphenols

Pérez-Larrán

Díaz-Reinoso

Moure

et al. 2018

Current Opinion in Food Science

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Separation and Purification of Polyphenols from Pericarpium Granati Using Macroporous Resins and Evaluation of its Anti-Streptococcus mutans Activity in vitro

Cited by 3 publications

References 14 publications

Continuous flow adsorption of phenolic compounds from olive mill wastewater with resin XAD16N: life cycle assessment, cost–benefit analysis and process optimization

Continuous flow adsorption of phenolic compounds from olive mill wastewater with resin XAD16N: life cycle assessment, cost–benefit analysis and process optimization

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

Adsorption technologies to recover and concentrate food polyphenols

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