Degradation of Acid Red B by the combined technology of ozonation and High-voltage pulsed discharge

摘要

In this study, the optimum conditions, the decolorization rate and the possible degradation mechanism were explored for the degradation of Acid Red B by the combined technology of ozonation and high voltage pulsed discharge (HVPD). The results suggested that the decolorization rate of the Acid Red B fitted the pseudo-first-order kinetics with initial dye concentration. The optimum ozone dose and pH was 4.0 g h−1 and 8.0, respectively. Compared to ozone alone, the combination of ozone and HVPD enhanced 25% of the decolorization rate. At the same time, a proposed degradation mechanism was put forward according to the degraded intermediates, which were analyzed by gas chromatography and mass spectrometry for nitrobenzene and benzene sulfonamide acid and were detected by ion chromatography for nitrate and sulfate ions and formic, acetic and oxalic acids. Therefore, the combined technology was a very promoting technology in the wastewater treatment.