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Dubowski Y, Alfiya Y, Gilboa Y, Sabach S, Friedler E. A combined approach of electrodialysis pretreatment and vacuum UV for removing micropollutants from natural waters. WATER RESEARCH 2024; 251:121152. [PMID: 38277830 DOI: 10.1016/j.watres.2024.121152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/24/2023] [Accepted: 01/15/2024] [Indexed: 01/28/2024]
Abstract
Advanced oxidation processes (AOPs) augment traditional water treatment methods, enhancing the removal of persistent contaminants. Efficiency of AOPs that utilize UV radiation for oxidants generation (e.g., ·OH) is reduced in water matrices that contain substants that may act as inner UV filters and/or scavengers for the generated radicals. Among such interfering compounds are major inorganic ions and dissolved organic matter that are naturally present in realistic waters. Thus, to improve AOPs efficiency it is desirable to separate the target pollutants from these natural species before treatment. Here the potential of electrodialysis as such pretreatment was investigated. The impact of this pretreatment on photo-oxidation of the pharmaceutical carbamazepine (CBZ) under VUV (λ<200 nm) irradiation, which yields ·OH generation via water homolysis, was tested in different water matrices. The obtained results indicate that in all tested solutions: Deionized water, groundwater, surface water, and treated wastewater, the addition of electrodialysis pretreatment successfully separated the target micropollutant CBZ from the major natural ions and to some extend the NOM, resulting faster degradation rates of CBZ and its transformation products in the following VUV-based AOP. Energy cost calculations indicated that addition of this pretreatment step reduces the overall energy demand of the system (i.e., energy consumption for the electrodialysis step was smaller than the energy gained by reducing the required VUV irradiation dose).
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Affiliation(s)
- Yael Dubowski
- Faculty of Civil and Environmental Engineering, Technion 32000, Israel.
| | - Yuval Alfiya
- Faculty of Civil and Environmental Engineering, Technion 32000, Israel
| | - Yael Gilboa
- Faculty of Civil and Environmental Engineering, Technion 32000, Israel
| | - Sara Sabach
- Faculty of Civil and Environmental Engineering, Technion 32000, Israel
| | - Eran Friedler
- Faculty of Civil and Environmental Engineering, Technion 32000, Israel
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Kovoor George N, Wols B, Santoro D, Borboudakis M, Bell K, Gernjak W. A novel approach to interpret quasi-collimated beam results to support design and scale-up of vacuum UV based AOPs. WATER RESEARCH X 2022; 17:100158. [PMID: 36325477 PMCID: PMC9619181 DOI: 10.1016/j.wroa.2022.100158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 10/04/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
UV-C at 254 nm and vacuum UV (VUV) at 185 nm are the two major emission lines of a low-pressure mercury lamp. Upon absorption of VUV photons, water molecules and selected inorganic anions generate hydroxyl (HO.) and other redox radicals, both capable of degrading organic micropollutants (OMPs), thereby offering the opportunity to reduce H2O2 and energy consumption in UV-based advanced oxidation process (AOP). To be successfully scaled-up, the dual-wavelength VUV+UV/H2O2 AOP requires laboratory-scale experiments to establish design criteria. The figures of merit typically used for reporting and interpreting quasi-collimated beam results for UV-based AOPs (time, dose, absorbed energy and EEO) are insufficient and inaccurate when employed for dual-wavelength AOP such as the VUV+UV/H2O2 AOP, and do not support system scale-up. In this study, we introduce a novel figure of merit, useful absorbed energy (uAE), defined as fraction of absorbed energy that results in the generation of oxidative radicals. Here, results of quasi-collimated beam VUV+UV/H2O2 AOP experiments on four different water matrices are used to introduce 2D plots that employ both uAEUV and uAEVUV as a novel method to represent laboratory-scale experiments of VUV+UV/H2O2 AOP and demonstrate how the 2D plots sufficiently support scale-up of the AOP.
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Affiliation(s)
- N. Kovoor George
- University of Girona, Plaça de Sant Domènec, 3, 17004 Girona, Spain
- Wetsus, European Center of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911MA Leeuwarden, the Netherlands
| | - B.A. Wols
- Wetsus, European Center of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911MA Leeuwarden, the Netherlands
- KWR Water Research Institute, Groningenhaven 7, 3433 PE Nieuwegein, the Netherlands
| | - D. Santoro
- Trojan Technologies, 3020 Gore Rd, London, ON N5V 4T7, Canada
- USP Technologies Canada ULC, 3020 Gore Rd, London, ON N5V 4T7, Canada
| | - M. Borboudakis
- Wetsus, European Center of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911MA Leeuwarden, the Netherlands
| | - K. Bell
- Brown and Caldwell, Walnut Creek, CA94596 , California, United States
| | - W. Gernjak
- Catalan Institute for Water Research (ICRA), 17003 Girona, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), 08100 Barcelona, Spain
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