Abstract
Advanced oxidation technologies (AOTs) focusing on nonthermal plasma induced by dielectric barrier discharge are adequate sources of diverse reactive oxygen species (ROS) beneficial for water and wastewater treatment. In this study, indigo, peroxytitanyl sulphate and terephthalic acid methods were used to approximate the concentrations of O3, H2O2 and OH produced in a double cylindrical dielectric barrier discharge (DCDBD) plasma configuration. The effect of pH and scavengers as well as the amount of chemical probes on the generation of oxidants was investigated. The efficiency of the DCDBD reactor was further evaluated using methylene blue (MB) as model pollutant. The results demonstrated that the formation of oxidants O3, H2O2 and OH in the DCDBD reactor was pH-dependent. Furthermore, the presence of scavengers such as phosphates, bicarbonates and carbonates in the solution diminished the amount of OH in the system and hence could impact upon the degree of detoxification of targeted pollutants during water and wastewater treatment. The MB simulated dye was totally decomposed into H2O, dissolved CO2 and simpler aqueous entities. Herein the DCDBD design is an adequate AOT that can be used worldwide for effective decontamination of water and wastewater.
Highlights
Textile, pharmaceutical, and other industries utilize a high amount of water and chemicals during their operation and, as a consequence, release large volumes of untreated water and wastewater containing complex and highly recalcitrant persistent organic pollutants (POPs) and microbes into water bodies [1,2]
The indigo method was employed to quantify the amount of O3 produced in the double cylindrical dielectric barrier discharge (DCDBD) reactor over time using distilled water as a model/baseline solution
The results show that the use of too little terephthalic acid (TA) below the molarity of 0.04 M in the DCDBD reactor may not capture many of the OH radicals produced [69]
Summary
Pharmaceutical, and other industries utilize a high amount of water and chemicals during their operation and, as a consequence, release large volumes of untreated water and wastewater containing complex and highly recalcitrant persistent organic pollutants (POPs) and microbes into water bodies [1,2]. Azo dyes present in textile wastewater, pharmaceuticals and personal care products in water and wastewater treatment plants (WWTPs) have been identified as the most persistent pollutants due to their intense colouration and occurrence in water sources which disrupt human health, ecological system, and aquatic lives [3]. This untreated/partially treated wastewater from various industries discharged into rivers, lakes, land etc.
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