臭氧氧化法处理焦化废水生化出水的反应动力学

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＇E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R。=0．9991，表观反应速率常数k。。=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。

Reaction kinetics of biological treatment of coking wastewater by ozonation

The kinetics of COD removal from the was investigated. The experimental results indicated ozonation process of biologically treated coking wastewater that ozonation of COD from biologically treated coking wastewater followed the apparent first-order kinetic model（the correlation coefficient R2 is 0. 9991, and the ap- parent rate constants kAbs is 1.01 ×10^-3）s-1） , and the COD removal was primarily oxidized by highly active hydroxyl radicals, under the conditions（the ozone dose of 8.50 mg/min, reaction temperature of 20 ℃ and the initial pH value of 10.61 ）. The results also indicated that the COD removals were similarly satisfied the appar- ent-first-order reaction kinetics depending on different ozone doses （50 - 12.75 mg/min） , different reaction temperatures （ 10 - 40℃ ） and different initial pH values （3.76 - 12.53）. With the increase of the ozone dose, the apparent rate constants of the COD removal increased from （0. 46×10^-3）s-1 to （0.78 ×10^-3）s-1, and with the increasing of reaction temperature, the apparent rate constant increased from （0. 427×10^-3）s-1to （1.40 ×10^-3）s-1. The higher reaction temperature of system has the less extent of the enhanced removal rate. The appar- ent rate constant increased from （0. 218×10^-3）s-1 s to （ 1.01 ×10^-3）s-1 with the initial pH values from 3.76 to 10. 61, but it decreased to （0. 857 ×10^-3）s-1 at initial pH value of 12.53.