UV-H_2O_2联用工艺去除水中阿特拉津的研究

采用间歇式反应器考察了UV-H2O2高级氧化技术去除水中阿特拉津的效果及其影响因素,并进行了相关的反应动力学研究。结果表明,在pH值6.9,阿特拉津初始浓度500μg/L,紫外辐照强度172μW/cm2时,H2O2投加量50mg/L,反应10min后,阿特拉津的去除率90%。UV-H2O2联用工艺对阿特拉津的降解符合一级反应动力学。H2O2在该联用工艺降解阿特拉津中具有双重作用,一方面,当H2O2投加量较小时,一级反应速率常数随H2O2投加量的增加基本呈现线性增加的趋势;另一方面,当H2O2浓度增加到一定程度(90mg/L)后,阿特拉津的降解速率随H2O2浓度的变化已不明显,而H2O2浓度为102mg/L时,则出现了抑制作用。

Study on Removal of Atrazine from Water Using UV-H2O2 Combination Process

Effect on atrazine removal from water and its affecting factors of the advanced oxidation technology UV-H2O2 were studied in batch reactors.The relevant kinetic analysis was conducted as well.The results show that at the conditions of pH 6.9,initial atrazine concentration as 250μg/L,UV irradiation intensity as 172μW/cm2 and H2O2 dosage as 50 mg/L with 10 minutes reaction time,the removal rate of atrazine reached above 90%.The degradation of atrazine accorded with first-order reaction kinetics.H2O2 played bidirectional role in the degradation of atrazine.On one hand,when the dosage of H2O2 was low,the speed constant of first-order reaction increased with the H2O2 dosage linearly;On the other hand,when the H2O2 concentration increased to a certain extent（90mg/L）,the rate of atrazine degradation with the H2O2 dosage insignificantly.Inhibition of H2O2 appeared when the concentration reached 102mg/L.