分体式流化床催化臭氧–絮凝工艺深度处理焦化废水生化尾水

采用催化臭氧–絮凝联用工艺处理焦化废水生化尾水, 寻求最优处理效果, 探究废水中溶解性有机污染物的特征和降解过程。通过自主设计的分体式流化床催化臭氧装置对废水进行处理, 结果表明, 在30%体积比的催化剂投加量、3 L/min的臭氧流量以及700 mg/L的絮凝剂投加量这一最佳反应条件下, 焦化废水生化尾水的COD去除率为83.7%, TOC去除率为72.3%。紫外–可见光谱和三维荧光光谱分析结果表明, 焦化废水生化尾水中普遍存在的芳香族化合物、腐殖酸类物质、可溶性微生物的代谢产物和富里酸类物质在催化臭氧化阶段被部分降解, 最终在絮凝阶段实现残留污染物和惰性中间产物的去除。

Split Fluidized Bed Catalytic Ozone-Flocculation Process for AdvancedTreatment of Biochemical Tail Water from Coking Wastewater

The catalytic ozonation-flocculation combined process was applied for the treatment of the biochemical tail water of coking wastewater. The optimal treatment performance was investigated and the characteristic and degradation process of dissolved organic pollutants in wastewater was studied. A self-designed split type fluidized bed catalytic ozonation reactor was adopted for the experiment. The results showed that under the optimal reaction conditions (30% catalyst dosage ratio, 3 L/min ozone flow rate, and 700 mg/L flocculant dosage), the COD removal rate of coking wastewater biochemical tail water was 83.7%, and the TOC removal rate was 72.3%. Through the analysis of ultraviolet-visible spectrum and three-dimensional fluorescence spectrum, the smell aromatic compounds, humic acid, soluble microbial metabolites, and fulvic acid material, generally presented in coking wastewater biochemical tail water, was partially degraded during the stage of catalytic ozonation, which was eventually removed in the flocculation stage. The intermediate was also degraded in the flocculation stage.