Shandong Province City Water Supply and Drainage Water Quality Monitoring Center, Jinan, 250101, China.
Environ Sci Pollut Res Int. 2024 Sep;31(43):55636-55647. doi: 10.1007/s11356-024-34823-4. Epub 2024 Sep 6.
The existence of natural organic matter (NOM) causes many problems in drinking water treatment processes. The degradation of different fractions of NOM in drinking water was studied using the ultraviolet/persulfate (UV/PS) process. The NOM was separated into hydrophobic (HPO), transition hydrophilic (TPI) and hydrophilic (HPI) fractions by reverse osmosis and XAD series resins. The effects of degradation were evaluated by dissolved organic carbon (DOC), UV, three-dimensional fluorescence-parallel factor analysis (EEM-PARAFAC), and trihalomethane formation potential (THMFP). The results showed that UV/PS process could remove the three fractions of DOC, UV, as well as the fluorescent components humic acid-like (C1 and C2) and protein-like (C3). The maximum removal rates of DOC of HPO, TPI, and HPI fractions were 34.6%, 38.4%, and 73.9%, respectively, and the maximum removal rates of UV were 72.1%, 86.3%, and 86.8%, respectively. The removal rate of the three fluorescent components can reach 100%, and C3 is easier to remove than C1 and C2 under the low PS dosage conditions. The order of kinetic degradation rate constant of UV first-order reaction is HPI > TPI > HPO. The optimum pH conditions for the degradation of HPO, TPI, and HPI fractions were acidic, basic, and neutral, respectively. The specific THMFP of HPO was higher than that of TPI and HPI. The specific THMFP of HPO and TPI fractions increased with the increase of radiation time, while the HPI fraction showed the opposite trend. THMFP has different degrees of correlation with DOC, UV, C1, and C2. This study can provide a theoretical basis for the selection of the UV/PS process for drinking water sources containing NOM with different characteristics.
天然有机物（NOM）的存在给饮用水处理工艺带来了许多问题。本研究采用紫外/过硫酸盐（UV/PS）工艺对饮用水中不同 NOM 组分的降解进行了研究。通过反渗透和 XAD 系列树脂将 NOM 分离成疏水性（HPO）、过渡亲水性（TPI）和亲水性（HPI）组分。通过溶解有机碳（DOC）、紫外吸光度（UV）、三维荧光-平行因子分析（EEM-PARAFAC）和三卤甲烷生成潜能（THMFP）评估了降解效果。结果表明，UV/PS 工艺可以去除三种 DOC、UV 和腐殖酸类（C1 和 C2）和蛋白质类（C3）荧光组分。HPO、TPI 和 HPI 组分的 DOC 去除率分别为 34.6%、38.4%和 73.9%，UV 去除率分别为 72.1%、86.3%和 86.8%。三种荧光组分的去除率均可达到 100%，在低 PS 投加量条件下，C3 比 C1 和 C2 更容易去除。UV 一级反应动力学降解速率常数的顺序为 HPI>TPI>HPO。HPO、TPI 和 HPI 组分的最佳降解 pH 条件分别为酸性、碱性和中性。HPO 的特定 THMFP 高于 TPI 和 HPI。HPO 和 TPI 组分的特定 THMFP 随辐照时间的增加而增加，而 HPI 组分则呈相反趋势。THMFP 与 DOC、UV、C1 和 C2 具有不同程度的相关性。本研究可为不同特性 NOM 饮用水源选择 UV/PS 工艺提供理论依据。
