Abstract
In dye decolorization tests a non-thermal plasma (NTP) corona discharge generated by a high voltage pin-to-ground plate displayed 82% color removal within 11 min. Total color removal was accomplished after 28 min. Different salts such as KCl, NaCl, CaCl2 and AlCl3 were utilized to check the influence of conductivity changes on the dye decolorization process. Higher dye solution conductivity improved the color removal efficiency. The discharge energy and degradation efficiency were computed for diverse concentrations for NaCl, KCl, CaCl2 and AlCl3, whereby it was noticed that the salts generally have a small impact on the level of dye decolorization using corona discharge. In addition, the essential reactive species involved in the oxidation of organic dye compounds such as ozone (O3) generated in treated water and hydrogen peroxide (H2O2) were investigated and the energetic species that produced the non-thermal plasma at the optimum operation time were determined. Energy yields for decolorization and Electrical Energy per Order (EE/O) were calculated for different concentrations of NaCl, KCl, CaCl2 and AlCl3. This work may help in designing plasma systems appropriate for treatment of industrial wastewaters polluted by dyes.
Highlights
Contamination in wastewaters created during manufacturing process is a very serious issue around the planet, and in Egypt
There are a variety of ways to generate non-thermal plasmas which include dielectric barrier discharge (DBD), RF, and corona discharge
The increasing conductivity signals a reduction in color removal efficiency
Summary
Contamination in wastewaters created during manufacturing process is a very serious issue around the planet, and in Egypt. In the old-style treatment methods waters, may be treated by either chemical or biological methods. These techniques often have some issues like the duration and cost of treatment, the requirement for big facilities, and the existence of some pollutants that are not degraded. There are a variety of ways to generate non-thermal plasmas which include dielectric barrier discharge (DBD), RF, and corona discharge. Corona discharge is considered a problem in power transmission applications, due to the losses caused and the generation of radio interference in high voltage transmission lines and equipment, but on the other hand corona discharges in gases have found many practical applications, for example in plasma reactors, electrophotography, electrostatic separation, cold plasma chemistry, air pollution control, electrostatic printing, etc.
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