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Membranes
Volume 9
Issue 2
10.3390/membranes9020027
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Article

Treatment of Two-Phase Olive Mill Wastewater and Recovery of Phenolic Compounds Using Membrane Technology

by
Varvara Sygouni
1,2,
Alexis G. Pantziaros
1,2,
Iakovos C. Iakovides
1,
Evangelia Sfetsa
1,
Polychronia I. Bogdou
1,2,
Emilia A. Christoforou
1,2 and
Christakis A. Paraskeva
1,2,*
1
Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece
2
Foundation for Research and Technology Hellas, Institute of Chemical Engineering Science, Stadiou Str., Platani, GR-26504 Patras, Greece
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(2), 27; https://doi.org/10.3390/membranes9020027
Submission received: 13 December 2018 / Revised: 10 January 2019 / Accepted: 26 January 2019 / Published: 5 February 2019
(This article belongs to the Special Issue Application of Membrane Filtration in Water and Industrial Wastes Treatment Processes)
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Abstract

The semi-solid wastes (pomace or alperujo) produced in the two-phase olive oil extraction process contains extremely high organic load and phenolic substances. Efficient treatment of such kinds of wastes using membrane filtration, should be sought to reduce the hazardous effects to the environment. On the other hand, phenolic compounds can be isolated and purified up to a level of commercial exploitation using the membrane technology. Firstly, the extraction process with mixtures of water and ethanol was optimized by testing extraction parameters (e.g., solvent’s mixture, duration, and temperature) at laboratory scale. Next, extraction was conducted using larger volumes and the treatment was continued in a pilot membrane filtration system, consisted of ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) membranes. The extracted solution from the olive oil pomace was fed to the pilot membrane filtration system, where all fat, lipids, and solids were removed while the phenolic compounds were concentrated in the retentate streams of NF and/or RO. Total phenolic content (TPC) at the RO’s concentrate stream was 225 mg/L and at the final effluent was lower than 10 mg/lt. The chemical oxygen demand (COD) value at the final effluent was much lower (~280 mg/L) than in the feed stream (>32,000 mg/L).
Keywords: phenols; extraction; membrane filtration; two phase pomace; olive mill solid waste phenols; extraction; membrane filtration; two phase pomace; olive mill solid waste

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MDPI and ACS Style

Sygouni, V.; Pantziaros, A.G.; Iakovides, I.C.; Sfetsa, E.; Bogdou, P.I.; Christoforou, E.A.; Paraskeva, C.A. Treatment of Two-Phase Olive Mill Wastewater and Recovery of Phenolic Compounds Using Membrane Technology. Membranes 2019, 9, 27. https://doi.org/10.3390/membranes9020027

AMA Style

Sygouni V, Pantziaros AG, Iakovides IC, Sfetsa E, Bogdou PI, Christoforou EA, Paraskeva CA. Treatment of Two-Phase Olive Mill Wastewater and Recovery of Phenolic Compounds Using Membrane Technology. Membranes. 2019; 9(2):27. https://doi.org/10.3390/membranes9020027

Chicago/Turabian Style

Sygouni, Varvara, Alexis G. Pantziaros, Iakovos C. Iakovides, Evangelia Sfetsa, Polychronia I. Bogdou, Emilia A. Christoforou, and Christakis A. Paraskeva. 2019. "Treatment of Two-Phase Olive Mill Wastewater and Recovery of Phenolic Compounds Using Membrane Technology" Membranes 9, no. 2: 27. https://doi.org/10.3390/membranes9020027

APA Style

Sygouni, V., Pantziaros, A. G., Iakovides, I. C., Sfetsa, E., Bogdou, P. I., Christoforou, E. A., & Paraskeva, C. A. (2019). Treatment of Two-Phase Olive Mill Wastewater and Recovery of Phenolic Compounds Using Membrane Technology. Membranes, 9(2), 27. https://doi.org/10.3390/membranes9020027

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