Ndzimandze Samkeliso S, Mahlangu Oranso T, Muleja Adolph A, Kuvarega Alex T, Nkambule Thabo T I
Institute for Nanotechnology and Water Sustainability (iNanoWS), University of South Africa (UNISA), Science Campus, 28 Pioneer Ave, Florida Park, Roodepoort, Johannesburg 1709, South Africa.
ACS Omega. 2025 Jun 27;10(27):28752-28762. doi: 10.1021/acsomega.4c10339. eCollection 2025 Jul 15.
Natural organic matter (NOM) is one of the major pollutants of concern in drinking water. In this study, the photo-Fenton process was applied for enhanced removal of NOM in drinking water samples collected from four drinking water treatment plants (DWTPs) in the KwaZulu-Natal Province of South Africa. The photo-Fenton process for NOM degradation was performed at pH 3 and a 3:10 ratio of Fe-(II) to HO under simulated solar light. Up to 73% UV reduction and 54% DOC removal after 20 min of irradiation were achieved in batch experiments. A specific ultraviolet absorbance (SUVA) value of 0.89 L/mg·m was attained, which is characteristic of low-molecular-weight organic compounds. Ring-opened oxidation products were detected using the gas chromatography time-of-flight mass spectrometry (GC-TOF MS) multiresidue method. The photo-Fenton process attained 30-55% NOM removal higher than that achieved by the respective sand filters of the DWTPs. Furthermore, the photo-Fenton treatment achieved near-complete (up to 89.0%) removal of chromophoric dissolved organic matter (CDOM) in drinking water. This study presents a potent approach to degrade NOM in drinking water.
天然有机物（NOM）是饮用水中主要的关注污染物之一。在本研究中，采用光芬顿工艺强化去除从南非夸祖鲁-纳塔尔省四个饮用水处理厂（DWTPs）采集的饮用水样品中的NOM。在模拟太阳光下，于pH 3以及Fe-(II)与H₂O₂的比例为3:10的条件下进行光芬顿工艺降解NOM。在批次实验中，辐照20分钟后实现了高达73%的紫外线去除率和54%的溶解性有机碳（DOC）去除率。获得了0.89 L/mg·m的特定紫外吸光度（SUVA）值，这是低分子量有机化合物的特征。使用气相色谱-飞行时间质谱（GC-TOF MS）多残留方法检测到了开环氧化产物。光芬顿工艺实现的NOM去除率比各DWTPs的砂滤器高30 - 55%。此外，光芬顿处理实现了饮用水中发色溶解性有机物（CDOM）近乎完全（高达89.0%）的去除。本研究提出了一种降解饮用水中NOM的有效方法。
