Abstract
Effect of Water Parameters on Decolourization Efficiency of Organic Dyes by Dielectric Barrier Discharge Plasma
Highlights
Organic dyes in aqueous solution are widely used in many manufacturing techniques, especially in the textile industry
The concentration of hydrogen peroxide formed in the two dye solutions during plasma treatment was found to increase with the plasma treatment time
Cesaro et al [2013] have examined the combination of advanced oxidation processes (AOP) with conventional biological processes; they used main standard tests and parameters for wastewater biodegradability assessment and found that the action mechanism of AOPs relies on the formation of high reactive oxidant species, mainly hydroxyl radicals
Summary
Organic dyes in aqueous solution are widely used in many manufacturing techniques, especially in the textile industry. As organic dyes show high solubility in water, making them difficult to remove by conventional methods, the treatment of industrial dyeing effluents should be performed before being discharging in waste streams [Anjaneyulu et al 2005]. Different techniques of advanced oxidation processes (AOP) can be used for the degradation of organic dyes in the effluent water. Oturan et al [2014] describe AOPs as promising, efficient, and environmental-friendly methods developed to principally remove persistent organic pollutants (POPs) from waters and wastewaters, and they consider the performances of various types of AOPs, based on the chemical, photochemical, sonochemical, and electrochemical reactions in degradation and destruction of toxic and/or POPs in aquatic media. Microwave plasma jet (MWPJ) submerged into water was used by [Hamdan et al 2018] in order to study its feasibility in wastewater treatment and found that a significant improvement in the efficiency is achieved by adding 1–3% of N2 to the Ar gas, which should be attributed to a combined effects of NH radicals, having high redox potential, and the backward reactions of H2O2 to form the OH radicals with NO and NO2. [Preis et al 2013] employed pulsed Corona discharge (PCD) with the objective of establishing the ratio of ozone and OH radicals contributions directly formed from water to oxidation of rapidly reacting phenol and slowly reacting oxalate and they concluded that the PCD method appeared to be highly effective in the oxidation of phenol, surpassing the closest competitor, conventional ozonation, in energy efficiency
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