School of Environment and Civil Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, PR China.
School of Environment and Civil Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, PR China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China; Jiangsu Engineering Laboratory of Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi, Jiangsu, 214122, PR China; Water Treatment Technology and Material Innovation Center, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, PR China.
Chemosphere. 2023 Oct;339:139725. doi: 10.1016/j.chemosphere.2023.139725. Epub 2023 Aug 3.
Dissolved organic matter (DOM) is reported to be a precursor to disinfection by-products (DBPs), which have adverse effects on human health. Therefore, it is crucial to effectively remove DOM before water disinfection. Characteristics of DOM and DBPs formation during advanced treatment processes including coagulation, adsorption, ultraviolet (UV) irradiation, and ozone (O) oxidation in municipal secondary effluent were investigated in this research. DOM was characterized by Fourier transform infrared spectroscopy (FTIR), excitation-emission matrix fluorescence spectroscopy (EEM), and Orbitrap mass spectrometry (Orbitrap MS). Moreover, DBPs formation potential under different advanced treatment processes was also discussed. FTIR results indicated that various functional groups existing in DOM may react with the disinfectant to form toxic DBPs. EEM analysis indicated that DOM in all water samples was dominated by soluble microbial product-like (SMPs) and humic acid-like (HA) substances. The municipal secondary effluent was abundant with DOM and rich in carbon, hydrogen, oxygen, and nitrogen atoms, contained a certain dosage of phosphorus and sulfur atoms, and the highest proportion is lignin. Most of the precursors (CHO features) had positive double bond equivalent subtracted oxygen per carbon [(DBE-O)/C] and negative carbon oxidation state (Cos) in all four different advanced treatment processes. DBPs formation potential (DBPFP) of coagulation, adsorption, UV irradiation, and O oxidation advanced treatment processes were 487 μg L, 586 μg L, 597 μg L, and 308 μg L, respectively. And the DBPs precursors removal efficiency of coagulation, adsorption, UV irradiation, and O oxidation advanced treatment processes were 50.8%, 40.8%, 39.8%, and 69.0%, respectively. This study provides in-depth insights into the changes of DOM in municipal secondary effluent at the molecular level and the removal efficiency of DBPs precursors during coagulation, adsorption, UV irradiation, and O oxidation advanced treatment processes.
溶解有机物（DOM）被报道为消毒副产物（DBPs）的前体，对人类健康有不良影响。因此，在水消毒前有效地去除 DOM 至关重要。本研究考察了包括混凝、吸附、紫外线（UV）辐照和臭氧（O）氧化在内的高级处理工艺中 DOM 的特性和 DBPs 的形成。通过傅里叶变换红外光谱（FTIR）、激发发射矩阵荧光光谱（EEM）和轨道阱质谱（Orbitrap MS）对 DOM 进行了表征。此外，还讨论了不同高级处理工艺下 DBPs 的形成潜力。FTIR 结果表明，DOM 中存在的各种官能团可能与消毒剂反应生成有毒的 DBPs。EEM 分析表明，所有水样中的 DOM 主要由可溶微生物产物样（SMPs）和腐殖酸样（HA）物质组成。城市二级出水富含 DOM，富含碳、氢、氧和氮原子，含有一定剂量的磷和硫原子，最高比例是木质素。在所有四种不同的高级处理过程中，大多数前体物（CHO 特征）具有正的双烯键当量减去氧碳比（DBE-O/C）和负的碳氧化态（Cos）。混凝、吸附、UV 辐照和 O 氧化高级处理工艺的 DBPFPs 分别为 487μg/L、586μg/L、597μg/L 和 308μg/L。混凝、吸附、UV 辐照和 O 氧化高级处理工艺对 DBPs 前体物的去除效率分别为 50.8%、40.8%、39.8%和 69.0%。本研究深入了解了城市二级出水中 DOM 在分子水平上的变化以及在混凝、吸附、UV 辐照和 O 氧化高级处理工艺中 DBPs 前体物的去除效率。
