O3/H2O2处理嘧啶废水的研究
Study on treatment of wastewater containing pyrimidine by O3/H2O2
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摘要: 采用O3/H2O2法对嘧啶废水进行处理,考察了不同反应条件对嘧啶和COD去除率的影响,并对O3/H2O2降解嘧啶的反应机制和动力学进行了初步探讨。实验结果表明,在pH值为11,反应时间为70 min,O3流量为4 g/h,H2O2投加量为50 mmol/L的条件下,废水的嘧啶和COD的去除率分别达到86.46%和74.97%。嘧啶的去除率随自由基抑制剂叔丁醇增加而降低,说明O3/H2O2降解嘧啶主要为体系中·OH的贡献。同时动力学研究表明,O3/H2O2对嘧啶的降解符合一级反应动力学模型。Abstract: The effects of different conditions on removal rates of pyrimidine and COD were investigated. The reaction mechanism and kinetics on degradation of pyrimidine by O3/ H2O2 were also studied. The experimental results showed that the removal rates of pyrimidine and COD were up to 86.46% and 74.97%, respectively, under the conditions including pH 11, 70 min of reaction time, 4 g/h of ozone flow, and 50 mmol/L of H2O2. The removal rate of pyrimidine deceased with the increasing of the tert-butyl alcohol concentration, which suggested that the degradation of pyrimidine was mainly due to hydroxyl free radical reaction from O3/H2O2process. The kinetic study showed that the degradation of pyrimidine by O3/H2O2 was in accordance with the first-order kinetic model.
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Key words:
- O3/H2O2 /
- wastewater containing pyrimidine /
- COD /
- hydroxyl radical /
- kinetics
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