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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

Liu, Yanan, Shen, Xue, Sun, Jihui, Li, Pan, Zhang, Ai
Journal of chemical technology and biotechnology 2019 v.94 no.2 pp. 494-504
air, aniline, anions, carbonates, cations, chlorides, copper, electric potential, electrodes, geometry, hydrogen peroxide, hydroxyl radicals, iron, manganese, metal ions, microbubbles, nitrates, ozone, sulfates, wastewater
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