紫外联合过氧乙酸工艺降解废水中磺胺甲恶唑  

Combined Process of UV and Peracetic Acid for Sulfamethoxazole Degradation in Wastewater

作　　者：王婷 刘义青 田琳 付永胜 WANG Ting;LIU Yiqing;TIAN Lin;FU Yongsheng(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《净水技术》2024年第11期85-91,140,共8页Water Purification Technology

基　　金：四川省科技厅应用基础研究项目(2021YJ0385)。

摘　　要：文章研究了紫外联合过氧乙酸(UV/PAA)对水中磺胺甲恶唑(SMX)的降解,探讨了pH、PAA用量、SMX初始浓度以及常见水体成分对SMX降解的影响,分析了SMX在该体系中的降解机理,探讨了SMX可能的降解途径。结果表明:UV/PAA体系对SMX的降解符合准一级反应动力学模型,其对SMX的降解优于单独UV和单独PAA对SMX的降解。该体系在酸性条件下对SMX的降解率明显高于中性和碱性条件;提高PAA浓度,SMX的降解效率随之逐渐增大,但提高SMX初始浓度,SMX的降解效率却随之逐渐降低。NO_(3)^(-)、HCO_(3)^(-)的存在可以明显促进SMX的降解;而天然有机物的存在对SMX的降解有显著的抑制作用。在UV/PAA体系中,共检出5种SMX降解产物,由此提出了4种可能的SMX转化途径,包括羟基化、断键反应、氨基氧化和偶联反应。In this paper,the combined process of ultraviolet(UV)and peracetic acid(UV/PAA)for sulfamethoxazole(SMX)degradation in water was investigated.The effects of pH,PAA dosage,initial SMX concentration and common water constituents on the degradation of SMX in UV/PAA system were evaluated,and the degradation mechanism and pathways of SMX in this system were explored.The results showed that the degradation of SMX by UV/PAA system was in accordance with the pseudo-first order kinetic model,and the degradation of SMX by this system was superior to that by UV alone and PAA alone.The degradation efficiency of SMX in this system under acidic conditions was significantly higher than that under neutral and alkaline conditions.The degradation of SMX gradually increased by increasing the concentration of PAA,but gradually diminished by increasing the initial concentration of SMX.The presence of NO_(3)^(-) and HCO_(3)^(-) could significantly promote SMX degradation,while natural organic matter had an obvious inhibitory effect on the degradation of SMX.Five SMX degradation products were detected in UV/PAA system,which led to the proposal of four possible SMX transformation pathways,including hydroxylation,bond-breaking reaction,amino oxidation and coupling reaction.

关 键 词：紫外光 过氧乙酸 磺胺甲恶唑 有机自由基 羟基自由基 

分 类 号：X703[环境科学与工程—环境工程]