The conversion mechanisms of chlorine species (including free chlorine, monochloramine (NH₂Cl), dichloramine, and total chlorine), nitrogen species (including ammonium (NH₄⁺), nitrate (NO₃⁻), and nitrite (NO₂⁻)) as well as the formation of disinfection by-products (DBPs) in a UV-activated mixed chlorine/chloramines system in water were investigated in this work. The consumption rates of free chlorine and NH₂Cl were significantly promoted in a HOCl/NH₂Cl coexisting system, especially in the presence of UV irradiation. Moreover, the transformation forms of nitrogen in both ultrapure and HA-containing waters were considerably affected by UV irradiation and the mass ratio of free chlorine to NH₂Cl. NO₃⁻ and NO₂⁻ can be easily produced under UV irradiation, and the removal efficiency of total nitrogen with UV was obvious higher than that without UV when the initial ratio of HOCl/NH₂Cl was less than 1. The roles of different radicals in the degradation of free chlorine, NH₂Cl and NH₄⁺ were also considered in such a UV-activated mixed chlorine/chloramines system. The results indicated that OH• was important to the consumption of free chlorine and NH₂Cl, and showed negligible influence on the consumption of NH₄⁺. Besides, the changes of DOC and UV₂₅₄ in HA-containing water in UV-activated mixed chlorine/chloramines system indicated that the removal efficiency of DOC (24%) was much lower than that of UV₂₅₄ (94%). The formation of DBPs in a mixed chlorine/chloramines system was also evaluated. The yields of DBPs decreased significantly as the mass ratio of HOCl/NH₂Cl varied from 1 : 0 to 0 : 1. Moreover, compared to the conditions without UV irradiation, higher DBPs yields and DBP-associated calculated toxicity were observed during the UV-activated mixed chlorine/chloramine process.

氯物质（包括游离氯，氯胺（NH的转换机构₂ Cl）的，二氯胺，和总氯），氮物种（包括铵（NH ₄ ⁺），硝酸（NO ₃ ^- ），和亚硝酸根（NO ₂ ^- ）在这项工作中，还研究了紫外线活化的水中氯/氯胺混合系统中消毒副产物（DBP）的形成。在HOCl / NH _2中，游离氯和NH ₂ Cl的消耗速率显着提高Cl共存体系，特别是在紫外线照射下。此外，紫外线辐射和游离氯与NH ₂ Cl的质量比极大地影响了超纯水和含HA的水中氮的转化形式。NO ₃ ^-和NO ₂ ^-可以很容易地在紫外光照射下产生的，并用UV总氮的去除率比明显高于无UV当次氯酸/ NH的初始比例₂氯是小于1的不同的作用自由基降解游离氯，NH ₂ Cl和NH ₄ ⁺在这种紫外线活化的氯/氯胺混合体系中也考虑了这一点。结果表明，OH·对游离氯和NH ₂ Cl的消耗很重要，对NH ₄ ⁺的消耗影响可忽略不计。此外，紫外线活化氯/氯胺混合体系中含HA的水中DOC和UV ₂₅₄的变化表明，DOC的去除效率（24％）远低于UV ₂₅₄（94％）。还评估了氯/氯胺混合体系中DBP的形成。随着HOCl / NH ₂的质量比，DBPs的产率显着下降。Cl在1∶0至0∶1之间变化。此外，与未进行UV照射的条件相比，在UV活化的氯/氯胺混合过程中观察到更高的DBP产率和与DBP相关的计算毒性。