臭氧氧化去除吐氏酸溶液COD的动力学研究

研究了臭氧氧化条件下，吐氏酸水溶液在鼓光反应器内的COD去除动力学，考察了pH值、温度、自由基抑制剂及进气口臭氧浓度等因素对反应的影响。结果表明：在pH=8左右时，COD去除效果较好；在17－30℃范围内，温度对反应影响不大；自由基抑制剂明显影响氧化效果，说明氧化过程是分子臭氧和其分解产生的自由基共同参与的结果；氧化降解效果与进气中臭氧浓度与正相关；臭氧氧化明显改善吐氏酸的生物降解性能，BOD5／COD可达0．18。研究表明：吐氏酸臭氧化的COD去除过程符合一级反应动力学。

Study on Kinetics for Removal COD from Tobias Acid Solution by Ozonation

This paper focusing on COD removal kinetics of Tobias acid solution ozonation in a bubble reactor. Effects of some kinetic parameters such as pH, temperature, radical inhibitor and ozone dosage have been studied. The result showed: when pH was 8 the removal rate was the highest; the temperature has no evident effect on the reaction;radical inhibitor (HCO3-)repressed ozonation greatly indicated that the process was due to ozone molecules and radicals; oxidation and reduction rate were directly correlated to the ozone dosage of the inlet; ozonation improved apparently the biodeg-radation ability of Tobias acid whose BOD5/COD was from 0.013up to 0.18 after ozonation;the reaction followed the pseudo first-order kinetics versus the COD.