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臭氧氧化法处理焦化废水生化出水的反应动力学

Keywords: 臭氧氧化,焦化废水,动力学,表观反应速率常数

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Abstract:

对臭氧氧化去除焦化废水生化出水COD的反应动力学及其影响因素进行了实验研究,结果表明,在臭氧投加量为8.50mg/min,反应温度为20℃和初始pH为10.61条件下,对COD的降解符合表观一级反应动力学模型,其相关系数R2=0.9991,表观反应速率常数kAbs=1.01×10-3s-1。该条件下,臭氧氧化对COD的降解主要来源于高活性羟基自由基的强氧化作用。在不同的臭氧投加量(4.25~12.75mg/min)、不同的反应温度(10~40℃)和不同的初始pH(3.76~12.53)下,COD的降解也同样遵循一级反应动力学规律。随着臭氧投加量的增大,COD降解的表观反应速率常数从(0.554×10-3)s-1增加到(1.06×10-3)s-1;随着反应温度的升高,表观反应速率常数从(0.427×10-3)s-1增加到(1.40×10-3)s-1,温度越高反应速率提高的幅度却越小;在初始pH3.76~10.61范围内,表观反应速率常数从(0.218×10-3)s-1增加到(1.01×10-3)s-1,在初始pH为12.53时表观反应速率常数下降到(0.857×10-3)s-1。

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