Abstract
The rapid growth in world population brings with it the need for improvement in the current technology for water purification, in order to provide adequate potable water to everyone. Although an advanced oxidation process has been used to purify wastewater, its action mechanism is still not clear. Therefore, in the present study we treat dye-polluted water with gamma rays and dielectric barrier discharge (DBD) plasma. We study the wastewater treatment efficiency of gamma rays and DBD plasma at different absorbed doses, and at different time intervals, respectively. Methyl orange and methylene blue dyes are taken as model dyes. To understand the effects of environment and humidity on the decolorization of these dyes, we use various gas mixtures in the DBD plasma reactor. In the plasma reactor, we use the ambient air and ambient air + other gas (oxygen, nitrogen, and argon) mixtures, respectively, for the treatment of dyes. Additionally, we study the humidity effect on the decolorization of dyes with air plasma. Moreover, we also perform plasma simulation in different environment conditions, to understand which major radicals are generated during the plasma treatments, and determine their probable densities.
Highlights
In recent years, drastic increases in pollutants in water resources have been detected[1,2,3]
dielectric barrier discharge (DBD) plasma parameters and analysis of reactive species generated in the gas phase
We can conclude that plasma reactors with different feeding gases and gamma rays have strong potential to decolorize methyl orange and methylene blue dyes
Summary
The dependence of power density as a function of voltage that we obtained, using these gases in the treatment chamber at atmospheric pressure. In these conditions, we analyzed the concentration of H2O2, NO2−, NO3−, O3, OH, and NO after the DBD plasma. The degradation of organic dyes (methyl orange and methylene blue) using gamma rays and DBD plasma in the presence of different gases (O2, N2, Ar, and Air) is a complex process. These simulation studies show that the densities of O, O3, and OH are high in given plasma conditions and due to their high reduction potential it helps in the degradation of dyes
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