This study is the first to reveal that the iron-catalyzed photo-activation of persulfate (UV/PS/Fe²⁺system) under mercury-free KrCl excilamp irradiation (222 nm) is capable of simultaneous degradation of an organic pollutant and inactivation of a microorganism in aqueous media using the herbicide atrazine (ATZ) and E. coli as model contaminants, respectively. Deionized water, natural water and wastewater effluents, contaminated with 4 mg/L ATZ and/or 10⁵ CFU/mL E. coli, were sequentially treated by direct UV, UV/PS and UV/PS/Fe²⁺ processes. Lowering the pH to 3.5 accelerated both the degradation and inactivation during the UV/PS/Fe²⁺ treatment of natural water. Comparison of the apparent UV dose-based pseudo first-order rate constants showed the negative effect of E. coli on ATZ degradation by decreasing rates in all of the examined water matrices. This can be due to the competitive effect between ATZ and bacterial cells for reactive oxygen species (ROS). By contrast, E. coli in the presence of ATZ was inactivated faster in natural water and wastewater (but not in deionized water), as compared to the case without ATZ. A scheme of possible synergistic inactivation under ROS exposure in water, containing ATZ, natural organic matter and chloride ions as primary constituents, was proposed. Radical scavenging experiments showed a major contribution of SO₄•^- to ATZ degradation by UV/PS/Fe²⁺ treatment of deionized water and natural water. The UV doses, required for 90% removal of ATZ from natural water and wastewater, achieve 160 mJ/cm² (pH 5.5) and concurrently provide 99.99% E. coli inactivation. These results make the UV/PS/Fe²⁺ system with narrow band UV light sources promising for simultaneous water treatment and disinfection.

这项研究是第一个揭示在无汞KrCl激发电流（222 nm）下铁催化过硫酸盐（UV / PS / Fe ²⁺系统）能够同时降解有机污染物和灭活有机污染物的方法。分别使用除草剂at去津（ATZ）和大肠杆菌作为模型污染物的水介质中的微生物。用直接UV，UV / PS和UV / PS / Fe ²⁺工艺依次处理被4 mg / L ATZ和/或10 ⁵ CFU / mL大肠杆菌污染的去离子水，天然水和废水。将pH值降低至3.5可以加速UV / PS / Fe ²⁺的降解和失活处理天然水。基于表观紫外线剂量的伪一级速率常数的比较显示，大肠杆菌通过降低所有检查的水基质中的速率，对ATZ降解具有负面影响。这可能是由于ATZ和细菌细胞之间对活性氧（ROS）的竞争作用。相比之下，与没有ATZ的情况相比，存在ATZ的大肠杆菌在天然水和废水中（但在去离子水中的）灭活速度更快。提出了一种在水中ROS暴露下可能的协同失活的方案，该方案以ATZ，天然有机物和氯离子为主要成分。自由基清除实验表明，SO ₄ • ^-的主要贡献UV / PS / Fe ²⁺处理去离子水和天然水对ATZ的降解。90％的天然水和废水中的ATZ去除所需的紫外线剂量达到160 mJ / cm ²（pH 5.5），并同时提供99.99％的大肠杆菌灭活作用。这些结果使得具有窄带紫外光源的UV / PS / Fe ²⁺系统有望用于同时进行水处理和消毒。