活性红M-3BE在多级臭氧气浮工艺中的迁移转化特性

Because of the limited removal efficiency for organic matters in printing and dyeing wastewater by traditional sludge process, the pilot-scale test system of the dual-step ozone induced flotation (DOIF) was developed for the advanced treatment of the printing and dyeing wastewater of reactive red M-3BE in this study. The effects of different operation parameters on DOIF treatment efficiency were studied for the optimization of this process. Then UV-vis spectrophotometer, three-dimensional fluorescence (3D-EEM) and liquid chromatography were used to identify the transformation of organic compounds in printing and dyeing wastewater. The results showed that a good decolorization performance was obtained by ozone flotation oxidization in DOIF process. At the ozone dosage of 21 mg∙L^-1, PAC dosage of 9 mg∙L^-1, and 40% reflux ratio, both the decolorization efficiency of the printing and dyeing wastewater of reactive red M-3BE and removal rate of DOC were 99.1% and 25.2%, respectively. During the degradation processing of reactive red M-3BE by DOIF, the mineralization of ozone catalytic oxidation process played a major role. The mechanism was speculated that the bonds of reactive red M-3BE were asymmetrically broken as Ⅰ, Ⅱ and Ⅲ. Then Ⅰ was decomposed into two intermediates with naphthalene and naphthol as the subsequent decomposition products. Ⅱ and Ⅲ were decomposed into mesitylene triazine and benzene ring, respectively. An obvious removal effect of printing and dyeing wastewater of reactive red M-3BE was proved for DOIF process, which provides a reference for its engineering application.