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Impact of Advanced Oxidation Products on Nanofiltration Efficiency

1
Department of Environmental Engineering, Textile Research Institute, Brzezińska 5/15 Str., 92-103 Łódź, Poland
2
Department of Bioprocess Engineering, Faculty of Process and Environmental Engineering, Lodz University of Technology, Wólczańska 213 Str., 90-924 Łódź, Poland
*
Author to whom correspondence should be addressed.
Water 2019, 11(3), 541; https://doi.org/10.3390/w11030541
Received: 30 December 2018 / Revised: 5 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Advanced Oxidation Technologies in Industrial Wastewater Treatment)
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Abstract

The aim of the work was to determine the influence of salicylic acid (SA) oxidation products on the effectiveness of their further removal in the membrane filtration process. Two commercial polyamide-based polymer membranes, HL (GE Osmonics) and TS80 (TriSepTM), were used and characterized by SEM microscopic analysis, contact angles, and free surface energy. The products of salicylic acid oxidation, 2,3- and 2,5-dihydroxybenzoic acid and catechol, were determined and their impact on the removal of unreacted salicylic acid in the nanofiltration process was investigated. It was also checked to what extent and why they were retained or not by the membranes. The results of the research have shown that the main product of salicylic acid oxidation, 2,3-dihydroxybenzoic acid, has a negative impact on the retention of salicylic acid in the nanofiltration stage, while the other product, catechol, improves SA retention. The determined values of contact angles correlate well with solubility (S) of the tested compounds, which increases in the following order SSA < S2,3-DHBA < SCAT, while the contact angle of the membrane decreases. Nevertheless, it has been shown that some oxidation products can penetrate the environment due to poorer membrane separation properties of these products. View Full-Text
Keywords: nanofiltration; AOPs (advanced oxidation processes); wastewater; salicylic acid; membrane characterization nanofiltration; AOPs (advanced oxidation processes); wastewater; salicylic acid; membrane characterization
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Żyłła, R.; Milala, R.; Kamińska, I.; Kudzin, M.; Gmurek, M.; Ledakowicz, S. Impact of Advanced Oxidation Products on Nanofiltration Efficiency. Water 2019, 11, 541.

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