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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
Author(s) -
Liu Yanan,
Shen Xue,
Sun Jihui,
Li Pan,
Zhang Ai
Publication year - 2019
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5796
Subject(s) - aniline , dielectric barrier discharge , degradation (telecommunications) , dielectric , matrix (chemical analysis) , nonthermal plasma , materials science , coupling (piping) , chemical engineering , chemistry , analytical chemistry (journal) , plasma , composite material , environmental chemistry , optoelectronics , organic chemistry , electrical engineering , physics , quantum mechanics , engineering
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 (Cu 2+ , Fe 2+ and Mn 2+ ), while it was also found that with the presence of certain anions (CO 3 2− , Cl − , NO 3 − and SO 4 2− ), the degradation process was inhibited by more than 40%. The coexisting organics did not influence aniline removal. Active species (•OH, H 2 O 2 and O 3 ) 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