活性红M-3BE在多级臭氧气浮工艺中的迁移转化特性

针对传统污泥法对印染废水中有机物去除效果有限的问题，利用多级臭氧气浮中试实验系统(DOIF)对活性红M-3BE印染废水进行深度处理，研究不同操作参数对DOIF工艺处理效果的影响，优化DOIF工艺。为进一步确定印染废水中有机物的迁移转化过程，采用紫外可见分光光度计、三维荧光(3D-EEM)和液相色谱等方法进行了分析。结果表明，臭氧气浮氧化脱色效果良好，臭氧投加量、PAC投加量和回流比分别为21 mg?L-1、9 mg?L-1和40%的情况下，废水脱色率和DOC去除率分别达到99.1%和25.2%。臭氧气浮降解活性红M-3BE的工艺中，臭氧催化氧化过程中的矿化起主要作用。其作用机理推测为，首先活性红M-3BE非对称断键为Ⅰ、Ⅱ和Ⅲ，其次Ⅰ分解为2种中间产物，并随后分解为萘和萘酚，Ⅱ分解为均三嗪，Ⅲ分解为苯环。多级臭氧气浮工艺对活性红M-3BE印染废水去除效果明显，为后续臭氧气浮技术工程化应用提供了参考依据。

Transformation of reactive red M-3BE during the treatment process of the dual-step ozone induced flotation

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.