In drinking water treatment plants, reduction of trihalomethane formation potential (THMFP) can be reached through precursor removal prior chlorine disinfection. In this work, the impact of TiO₂/UVA photocatalytic process on THMFP has been studied using different phenolics (phenol, resorcinol, catechol, hydroquinone and gallic acid) and citric acid as NOM surrogates. A solution of each surrogate was photocatalytically treated at pH 7 applying different UVA doses and then chlorinated. Resorcinol oxidation by TiO₂/UVA and THMFP reduction go hand in hand, indicating that the intermediates hardly form THMs when chlorinated. For the rest of surrogates, intermediates with medium-high specific THMFP (maximum values 40–120 μg CHCl₃ (mg DOC)⁻¹ for phenols; and ∼1000 μg CHCl₃ (mg DOC)⁻¹ for citric acid) are initially formed and disappear at higher UVA doses. TiO₂/UVA treatment of water matrices with high and low specific UV absorption at 254 nm (SUVA₂₅₄) (Sigma-Aldrich humic acid, pH 7; and water from Villar del Rey reservoir; Badajoz-Spain), was also investigated. For surface water UVA doses higher than 5 kWh m⁻³ were needed to achieve a THMFP below 100 μg THM L⁻¹. During water treatment, an initial negative impact of AOPs in general and TiO₂/UVA in particular on THMFP is expected.

在饮用水处理厂中，可以通过在氯气消毒之前先去除前体来降低三卤甲烷生成潜能（THMFP）。在这项工作中，已经研究了使用不同的酚类（苯酚，间苯二酚，邻苯二酚，对苯二酚，对苯二酚和没食子酸）和柠檬酸作为NOM替代物来研究TiO ₂ / UVA光催化工艺对THMFP的影响。使用不同的UVA剂量在pH 7下对每种替代物的溶液进行光催化处理，然后进行氯化处理。TiO ₂ / UVA和间苯二酚还原反应对间苯二酚的氧化作用相辅相成，表明中间体在氯化时几乎不形成THM。对于其他替代物，是具有中等高比重THMFP（最大值40–120μgCHCl ₃（mg DOC）^-1）的中间体用于苯酚；最初形成约1000μg的CHCl ₃（柠檬酸的mg DOC）^-1，并在较高的UVA剂量下消失。还研究了用TiO ₂ / UVA处理在254 nm（SUVA ₂₅₄）（Sigma-Aldrich腐殖酸，pH 7；比利亚德尔德尔雷水库；巴达霍斯-西班牙）中的水的高和低比紫外线吸收的水基质。对于地表水，需要高于5 kWh m ^-3的UVA剂量才能使THMFP低于100μgTHM L ^-1。在水处理过程中，一般而言，AOP尤其是TiO ₂ / UVA对THMFP会产生最初的负面影响。