Treatment of aniline wastewater by using dielectric barrier discharg

The nonthermal plasma technology using dielectric barrier discharge(DBD) was investigated for the treatment of aniline wastewater. The effects of the distance between electrodes and solution, input power, plasma-treatment time, different initial pH of wastewater solutions, addition of inorganic anions(Cl^-, SO_42-, CO_32-)and Fe²⁺on the decompositon were studied. The experimental results indicated that abatement of 100 mg/L aniline wastewater increased with the input power. Under the same conditions, higher abatement was obtained when the distance between electrode and solution was zero mm. About 84.32% of aniline was removed after 10 min plasma-treatment time, at an input power of 480 W. The initial pH had a significant impact on the removl of aniline. Weak acid and weak alkaline conditions were conducive to the aniline treatment. It was found that the extent of degradation increased with the addition of certain NaCl, Na₂SO₄, Na₂CO₃ and Fe_.²⁺The removal of aniline could be increased to 94.52% while 50 mg/L NaCl(calculated by the concentration of Na⁺) was added to the solution. About 99.72% of aniline was removed after 10 min plasma-treatment time with concentration of 50 mg/L initial Fe²⁺.