Development and Optimization of Single Filament Plasma Jets for Wastewater Decontamination
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Development and Optimization of Single Filament Plasma Jets for Wastewater Decontamination S. A. Yehia1,2 · M. E. Zarif1,3 · B. I. Bita1 · M. Teodorescu4 · L. G. Carpen1,2 · S. Vizireanu1 · N. Petrea5 · G. Dinescu1,2 Received: 29 March 2020 / Accepted: 21 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract New efficient depollution techniques for water decontamination, purification and disinfection are being sought to replace those classic methods (chemical, filtration, ozonisation, photochemical reactions) that have deficiency for some substances. The use of plasma technologies, discharges in, or in contact with, wastewater are promising approaches for the decomposition of pollutants by highly oxidative radicals, charged particles, UV radiation, etc. produced by plasma. In the present study we report on the potential of radiofrequency single and multiple filamentary Dielectric Barrier Discharge (DBD) jets for the decolorization of methylene blue (MB) dye in water solutions. Optical emission spectroscopy (OES) investigations were performed for the characterization of plasma evolving in air, and in liquid. The decolorization process was monitored by absorption spectroscopy. We determined the decolorization time, according to a variety of external parameters. The key parameters for obtaining the maximum decolorization rate were identified as being the discharge tube diameter, tube nature (glass/ceramic), the injected power in the discharge, the type of reactive gas and the number of filamentary plasma jets. Keywords Submerged plasma in liquid · Filamentary plasma · Wastewater decontamination · Dye decolorization · Methylene blue decolorization
* B. I. Bita [email protected] * S. Vizireanu [email protected] 1
National Institute for Lasers, Plasma and Radiation Physics, 77125 Magurele–Bucharest, Romania
2
Faculty of Physics, University of Bucharest, 77125 Magurele–Bucharest, Romania
3
Faculty of Engineering in Foreign Languages, University “Politehnica” of Bucharest, Bucharest, Romania
4
Institute of Space Science, Subsidiary of National Institute for Lasers, Plasma and Radiation Physics, 77125 Magurele–Bucharest, Romania
5
Scientific Research Centre for CBRN Defense and Ecology, 041309 Bucharest, Romania
13
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Plasma Chemistry and Plasma Processing
Introduction Nowadays, one of the main environmental problems is water pollution [1]. This widespread problem is jeopardizing our health, mainly because the wastewater volume has increased due to the global industrial developments. This wastewater contains harmful organic and inorganic impurities, and these may be responsible for various illnesses. In order to solve this issue, it is necessary to deepen our understanding of the physical–chemical aspects of water-decontamination, in particular those related to treatments for wastewater reprocessing. There are well-known classical methods for water depollution such as chemical methods [2] and filtration [1]. Chemical decontamination involves major disa
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