Abstract
Water scarcity and water contamination due to the extensive use of organic compounds in industries trigger us to adopt modern techniques for wastewater treatment. In this research, we developed a new dielectric barrier discharge (DBD) system which was evaluated for the degradation of nitrobenzene in water under different experimental arrangements. DBD produces an enormous amount of active species like O3, •O, O2+ and O2− and •OH to degrade the pollutants. In this study, NB (Nitrobenzene) was treated from wastewater by changing the gas flow rate, adopting different carrier gas, by adding inhibitors and promoters and the effect of applied voltage on the production of active species to check the effectiveness of the DBD system. The DBD system was evaluated based on input power, degradation efficiency and energy yield compared with other advanced oxidation processes. The energy yield of the DBD system was 1.253 mg/kWh for the degradation of 20 mg/L of NB to 75% in 60 min with the discharge power of 0.538 W, which displays better results in comparison with the other AOPs regarding energy yield and the degradation efficiency of the pollutant. The results illustrate the significance of the system and further suggest its application to industrial-scale treatment.
Highlights
Water scarcity and water pollution are major issues in the world at present
We focused to evaluate the dielectric barrier discharge (DBD) plasma reactor for the removal of NB applying different experimental conditions such as the effects of changing the gas flow rate, the frequency of the input gas, the effects of different inhibitor and promoter and effects of adding methanol
The DBD system was evaluated based on the degradation efficiencies and by comparing the reaction kinetics and energy yield with other published works to know the effectiveness of this system
Summary
Water scarcity and water pollution are major issues in the world at present. Persistent organic pollutants (POPs) are compounds that have alarming concerns because of their toxicity, bioaccumulation and perseverance among the ecosystems. Nitrobenzene (NB, Figure 1) is one of the nitro-aromatic compounds that has been used to produce aniline, dyes, explosives and various pharmaceutical products [2]. It is used as an organic solvent in water and soil because of its dispersive nature. We focused to evaluate the DBD plasma reactor for the removal of NB applying different experimental conditions such as the effects of changing the gas flow rate, the frequency of the input gas, the effects of different inhibitor and promoter and effects of adding methanol.
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