在本研究中，研究了两个可能影响强化混凝过程中消毒副产物前体去除的因素:自然有机物（NOM）特性的季节性变化和絮凝剂助剂的添加。在俄亥俄州的两个饮用水库，在一年的时间里，观察到UV254、有机物分子量或溶解有机碳（DOC）浓度几乎没有变化。随后，满足美国环境保护局（USEPA）强化混凝要求所需的三氯化铁用量变化也很小。在强化混凝过程中，至少在高分子剂量（10 mg/L或更高）下，添加助凝剂对去除吸收紫外线的NOM部分有积极影响。助凝剂的影响取决于聚合物的电荷密度，高电荷密度阳离子聚合物的影响最大，非离子助凝剂的影响相对较小。 还观察到，与所检查的天然水的紫外线吸收部分相比，阳离子絮凝剂助剂在去除合成水源水中的Aldrich humic酸的紫外线吸收部分方面明显更有效。虽然在三氯化铁凝聚过程中，助凝剂增强了UV254的去除，但添加这些聚合物并没有减少溶解的有机碳。包括13个参考文献、表格、图表。

In this study, two factors potentially influencing the removal of disinfection byproduct precursors during enhanced coagulation were examined: seasonal changes in natural organic matter (NOM) characteristics and the addition of flocculant aids. Little variation in UV254, organic matter molecular weight, or dissolved organic carbon (DOC) concentration was observed over the course of one year for two Ohio drinking water reservoirs. Subsequently, the dosage of ferric chloride required to meet United States Environmental Protection Agency (USEPA) enhanced coagulation requirements varied little as well. The addition of flocculant aids had a positive effect on the removal of the UV-absorbing NOM fraction during enhanced coagulation, at least at high polymer dosages (10 mg/L or greater). The influence of flocculant aids depended on the charge density of the polymer, with high charge density cationic polymers having the greatest influence and nonionic flocculant aids having relatively little effect. It was also observed that cationic flocculant aids were significantly more effective at removing the UV-absorbing fraction of Aldrich humic acid in synthetic source water as compared to the UV-absorbing fraction of the natural waters examined. While flocculant aids enhanced UV254 removal during ferric chloride coagulation, addition of these polymers did not reduce dissolved organic carbon. Includes 13 references, tables, figures.