The presence of Dissolved Organic Matter (DOM) can exert a strong influence on the effectiveness of the UV/chlorine process. This study examined the impact of five DOM isolates with different characteristics on the degradation kinetics of model contaminant primidone (PM) during UV/chlorine treatment. The formation of Disinfection By-Products (DBPs) from DOM after 15-min UV/chlorine treatment followed by 24 h chlorination was investigated and compared with chlorination alone. The use of chemical probes and radical scavengers revealed that ^•OH and ClO• were the main radical species responsible for the loss of PM at acidic and alkaline conditions, respectively. All tested DOM isolates significantly inhibited the decay of PM. A strong negative correlation (>0.93) was observed between the decay rate constants of PM and SUVA of DOM isolates, except for EfOM isolate, which induced the strongest inhibitory effect due to its higher abundance in sulfur-containing functional groups (i.e., sink of ^•OH/Cl^• radicals). Compared with chlorination, the formation of Adsorbable Organic Chlorine (AOCl) and Trichloromethane (TCM) during the UV/Chlorine process was enhanced and hindered for low SUVA isolates and high SUVA DOM, respectively. However, Dichloroacetonitrile (DCAN) formation was generally lower for all isolates except for Ribou Reservoir DOM at pH 8.4 because of its high reactive nitrogenous DBP precursors at caustic conditions. However, when normalized to the chlorine consumed, the UV/Chlorine process always led to a lower DBPs formation compared with chlorination alone.

溶解有机物（DOM）的存在会对UV /氯过程的有效性产生很大影响。这项研究检查了五个不同特性的DOM分离物对UV /氯处理过程中模型污染物primidone（PM）降解动力学的影响。研究了15分钟的UV /氯处理，随后24 h氯化处理后DOM形成的消毒副产物（DBP），并将其与单独的氯化处理进行了比较。使用化学探针和自由基清除剂发现^•OH和ClO•是分别在酸性和碱性条件下导致PM损失的主要自由基。所有测试的DOM分离物均显着抑制PM的衰减。观察到DOM分离物的PM和SUVA的衰减速率常数之间有很强的负相关性（> 0.93），但EfOM分离物由于其在含硫官能团中的丰度较高（即，^• OH / Cl ^•部首）。与氯化相比，UV /氯过程中可吸附有机氯（AOCl）和三氯甲烷（TCM）的形成分别得到增强，而对于低SUVA分离物和高SUVA DOM则受阻。但是，除了pH 8.4的Ribou Reservoir DOM外，所有分离株的二氯乙腈（DCAN）的形成通常都较低，这是因为其在苛刻条件下的高活性含氮DBP前体。但是，当对消耗的氯进行归一化处理时，与单独进行氯化处理相比，UV /氯处理始终导致较低的DBP生成量。