Abstract
Overcoming the disadvantages of electrolysis and photoelectrochemical processes is essential to create an integrated system with organic matter treatment and ion removal. Although electrodialysis and photoelectrochemical methods have broad application areas, there are some limitations due to their working principles. While electrodialysis shows excellent efficiency in ion separation, it needs pre-treatment for organic matters. Similarly, while photoelectrochemical methods are successful in treating organic matter, they are insufficient in ion separation. A new integrated photoelectrochemical reactor with ion-exchange membranes was developed to combine electrodialysis and photoelectrochemical processes to overcome those disadvantages. The desalination and treatment performance of the new reactor were tested by using humic acid and sodium chloride solution. Investigation of the desalination performance in the reactor was carried out with 1 g/L sodium chloride under different applied potentials of 1 V, 3 V, 5 V, and 10 V. The desalination performance of the reactor was found to be 46.08%, 54.10%, 66.67%, and 42.05%, respectively. Also, 56% of organic removal was obtained during desalination. Also, toxicity analyses were carried out to investigate the disinfection by-products effect on the system, and no toxicity increase in the treated solution was observed. This study shows that electrodialysis and photoelectrochemical processes can work as an integrated system in the same reactor. However, further improvement and optimization in the reactor are still required to achieve better treatment and removal efficiency.
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Acknowledgements
The authors would like to thank Balkan Arif Aydin for his valuable contribution. This study was supported by the Istanbul University-Cerrahpasa (Grant Number: 55897), Turkish Scientific and Technical Research Council and ERA-NET co-fund Action Water JPI (Project Acronym: ECOSAFEFARMING—Grant number 117Y194).
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Aydin, M.I., Selcuk, H. Development of a UV-based photocatalytic electrodialysis reactor for ion separation and humic acid removal. Int. J. Environ. Sci. Technol. 20, 5913–5924 (2023). https://doi.org/10.1007/s13762-022-04358-7
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DOI: https://doi.org/10.1007/s13762-022-04358-7