Abstract:

In view of the problems of the coking wastewater with high refractory organic matter content, high chromaticity, high toxicity and high difficulty of processing, a combined process including primary catalytic ozonation, microbial enhancement MBR and secondary catalytic ozonation were involved in its depth treatment. The influence of ozone concentrations on COD oxidative degradation and oxidation degradation mechanism in the process of two stage catalytic oxidation were explored. The results showed that when the COD of raw water was 150-200 mg/L, the concentration of O₃ in the two-stage catalytic ozonation was 57 mg/L and 80 mg/L respectively, the COD removal rate of wastewater could reached the optimum. The oxidation degradation process conforms to the first-stage reaction kinetics model. The process has the advantages of high COD removal rate and low cost.

Key words: catalytic ozonation, catalyst, deep processing, coking wastewater

摘要：

针对焦化废水中难降解有机物含量高、色度高、毒性大、处理难度高等问题，研究采用“一级催化臭氧氧化+生物强化MBR+二级催化臭氧氧化”组合工艺对其进行深度处理，探究了臭氧（O₃）浓度在两级催化氧化过程中对COD氧化降解的影响和氧化降解机制。结果表明，当原水COD为150~200 mg/L时，两级催化臭氧氧化废水中的O₃质量浓度分别为57、80 mg/L，能使COD去除率达到最优，氧化降解过程符合一级反应动力学模型。该工艺具有COD去除率高、成本低廉的优点。

关键词: 催化臭氧氧化, 催化剂, 深度处理, 焦化废水

CLC Number: 

• X703