Treatment of aniline contaminated water by a self‐designed dielectric barrier discharge reactor coupling with micro‐bubbles: optimization of the system and effects of water matrix

Abstract

BACKGROUND A self‐designed dielectric barrier discharge reactor coupling with micro‐bubbles (DBD/MB) system is proposed as a promising method to remove aniline in waste water. The optimum geometric dimensions of the reactor and the operating parameters of the DBD/MB system as well as the influence of the water matrix (including cations, anions, and coexisting organics) were investigated. The functional mechanisms of the DBD/MB system were explored. RESULTS By setting the double‐dielectric barrier discharge reactor (DDBD) with electrode gap as 5 mm, discharge voltage as 50 kV, and air intake flow of the MB generator as 40 mL min−1, the aniline removal efficiency reached 82% within an hour. The removal efficiency could be promoted by the presence of metal ions (Cu2+, Fe2+ and Mn2+), while it was also found that with the presence of certain anions (CO32−, Cl−, NO3− and SO42−), the degradation process was inhibited by more than 40%. The coexisting organics did not influence aniline removal. Active species (•OH, H2O2 and O3) generated in the DDBD/MB treatment and micro‐bubbles played important roles in the aniline degradation process. CONCLUSIONS This study provides fundamental information for the application of a DDBD/MB system to effectively remove aniline from water. © 2018 Society of Chemical Industry

Degradation of glucocorticoids in water by dielectric barrier discharge and dielectric barrier discharge combined with calcium peroxide: performance comparison and synergistic effects

“…(b)]. Because elevated conductivity hinders effective degradation of organic chemicals, a decrease in conductivity as a result of CaO 2 addition provides a conducive environment that enhances GC removal during DBD/CaO 2 treatment. Similar observations, that addition of CaCl 2 increased the wastewater purifying ratio while using nonthermal plasma treatment, were made by Qi et al.…”

Advanced Oxidation Processes for Emerging Contaminant Removal

“…The increase of the surface charges (ζ potentials) of the MBs, which were measured during their collapse, supported the hypothesis that the significant increase in ion concentration around the shrinking gas-water interface provided the mechanism for radical generation. Studies showed that compared with plasma treatment alone, the presence of MBs can significantly improve the treatment efficiency, and preliminary studies speculate that the presence of MBs can improve gas-liquid mass transfer in plasma water treatment [154,155]. MBs were introduced with different carrier gases (air, N2 and Ar) in the needleplate pulsed discharge reactor to enhance the interface reaction [156].…”

“…In addition to the different molecular structures of pollutants, the design and experimental conditions of a nonthermal plasma reactor also have a great influence. Due to the particularity of in situ Studies showed that compared with plasma treatment alone, the presence of MBs can significantly improve the treatment efficiency, and preliminary studies speculate that the presence of MBs can improve gas-liquid mass transfer in plasma water treatment [154,155]. MBs were introduced with different carrier gases (air, N 2 and Ar) in the needle-plate pulsed discharge reactor to enhance the interface reaction [156].…”

Colorimetric quantification of aqueous hydrogen peroxide in the DC plasma-liquid system

“…This investigation might be the first documented study of the discharge plasma-liquid interactions. Since then, applications of the plasma-liquid systems have been extensively explored [2], such as in wastewater treatment [3][4][5][6][7][8][9][10][11][12], nanomaterial synthesis [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], plasma medicine [30,31], plasma agriculture [32,33], and analytical chemistry [34][35][36][37][38][39][40][41][42]. These applications are mainly based on the physical and chemical processes induced by the interplay between the plasma and the liquid.…”