UV/氯高级氧化工艺降解水中典型药品和个人护理品(PPCPs)的效能与机理研究

Pharmaceuticals and personal care products (PPCPs) as emerging pollutants have become a major concern not only because of the threat posed to health and safety of the aquatic life but also due to their continuous accumulation in aquatic environment and development of antibiotic-resistant microbial strains. Single classical water treatment techniques have been generally inadequate for the removal of these hazardous substances. Combined UV/chlorine advanced oxidation processes (AOPs) is an exciting technology for removal of these pollutants because of high selectivity and degradation efficiency of chlorine free radicals. Degradation efficiency and reaction mechanism of amine-based and/or nitro-based PPCPs by combined UV/chlorine processes will be investigated in this program. These PPCPs such as ranitidine, nizatidine, doxylamine and carbinoxamine had been found had higher NDMAFPs and THMFPs after chlorine and chloramine disinfection. First of all, degradation kinetics of the selected typical PPCPs by combined UV/chlorine AOPs will be systematically investigated. Secondly, transformation products of the four typical PPCPs by combined UV/chlorine AOPs will be identified with the aid of high performance liquid chromatography combined with mass spectroscopy (LC-MS), and the degradation pathway of the selected PPCPs will be proposed based on the identification. Thirdly, the influence rule of different reaction conditions and water quality parameters on degradation of typical PPCPs by UV/chlorine AOPs will be researched. Finally, Formation potentials of disinfection by-products by UV/chlorine AOPs will be evaluated.

药品和个人护理品（PPCPs）是水中的一类新兴污染物，对人类健康和生态安全构成威胁。传统技术对PPCPs的控制十分有限。针对水中基于胺和硝基官能团的PPCPs在氯和氯胺消毒过程中，极易生成卤代硝基甲烷、亚硝胺类含氮消毒副产物的文献报道，选取水中常见的4 种典型PPCPs：ranitidine（雷尼替丁）和nizatidine（尼扎替丁）以及doxylamine(抗敏安)和carbinoxamine（卡比沙朋），结合UV/氯体系的Cl•、Cl2•–等含氯自由基选择性强、降解效率高的特点，提出采用UV /氯高级氧化技术对PPCPs进行降解效能和机理研究。系统地研究UV /氯技术对典型PPCPs降解的动力学；采用液相色谱和质谱联用等手段，研究这4种典型PPCPs的降解产物和降解途径；研究不同条件和不同水质参数对典型PPCPs降解的影响；研究UV/氯降解典型PPCPs生成消毒副产物的规律。

药品和个人护理品（PPCPs）是水中的一类新兴污染物，对人类健康和生态安全构成威胁 。传统技术对PPCPs的控制十分有限。针对水中基于胺和硝基官能团的PPCPs在氯和氯胺消毒过 程中，极易生成卤代硝基甲烷、亚硝胺类含氮消毒副产物的文献报道，选取水中常见的4 种典型含胺基和硝基官能团的PPCPs：ranitidine（雷尼替丁）和nizatidine（尼扎替丁）以及doxylamine(抗敏安)和car binoxamine（卡比沙朋），进行UV /氯高级氧化技术对PPCPs进行降解效能和机理研究，同时研究UV/Chlorine技术对它们产生的消毒副产物NDMAFPs和THMFPs生成势的减少作用。系统地研究了UV /氯技术对典型PPCPs降解的动力学；采用液相色谱和质谱联用等手段，研究了这4种典型PPCPs的降解产物和降解途径；研究了不同条件对典型PPCPs降解的影响；研究了UV/氯降解典型PPCPs生成消毒副产物的规律。.测定PPCPs及其NDMAFPs在不同剂量的氯氧化过程中的变化。分析了氧化产物结构与NDMAFP变化的关系。结果表明，用氯和UV/氯高级氧化法去除PPCPs是有效的。然而，只有紫外/氯能有效地降低NDMAFPs。对于所选4PPCPs紫外线/氯（氯剂量在10 mg/L）可以去除95%以上PPCPs和90%左右NDMAFPs。氧化后NDMAFPs的减少有两种可能的反应途径。