College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
Water Res. 2022 Jun 30;218:118492. doi: 10.1016/j.watres.2022.118492. Epub 2022 Apr 22.
Algal organic matter (AOM) is a potential precursor of disinfection byproducts (DBPs) in water treatment. It is a major challenge to identify macromolecular DBPs due to the diversity of AOM. In this study, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR/MS) was applied to diagnose the AOM diversity after algae removal by plasma oxidation and to recognize the macromolecular DBPs in subsequent chlorination. Significant removal of AOM released by M. aeruginosa, C. raciborskii, and A. spiroies was achieved by plasma oxidation, accompanied by decrease in the proportion of CHNO formulas and increase in CHO formulas. Without plasma treatment, chlorination generated approximately 2486 macromolecular carbonaceous DBPs (C-DBPs) and 1984 nitrogenous DBPs (N-DBPs), with CHOCl and CHNOCl as the most abundant DBPs. The numbers of C-DBPs and N-DBPs decreased by 63.3% and 62.9%, respectively, if plasma treatment was applied prior to chlorination. Network computational analysis revealed that Cl substitution was the main formation pathway of AOM-derived DBP formation rather than HOCl addition. The precursors of macromolecular DBPs contained a characteristic atomic number of C and O (7 ≤ C ≤ 18; 3 ≤ O ≤ 11). This study firstly disclosed the relationship between AOM diversity and novel macromolecular DBPs during algae-laden water treatment.
藻源有机物（AOM）是水处理中消毒副产物（DBPs）的潜在前体。由于 AOM 的多样性，识别大分子 DBPs 是一个重大挑战。在这项研究中，傅里叶变换离子回旋共振质谱（FT-ICR/MS）被应用于诊断藻类去除后的 AOM 多样性，并识别随后氯化过程中的大分子 DBPs。等离子体氧化显著去除了铜绿微囊藻、斜生栅藻和螺旋鱼腥藻释放的 AOM，同时 CHNO 公式的比例降低，CHO 公式的比例增加。如果不进行等离子体处理，氯化会产生约 2486 种大分子含碳 DBPs（C-DBPs）和 1984 种含氮 DBPs（N-DBPs），其中 CHOCl 和 CHNOCl 是最丰富的 DBPs。如果在氯化之前进行等离子体处理，C-DBPs 和 N-DBPs 的数量分别减少了 63.3%和 62.9%。网络计算分析表明，Cl 取代是 AOM 衍生 DBP 形成的主要途径，而不是 HOCl 加成。大分子 DBPs 的前体含有特征原子数 C 和 O（7 ≤ C ≤ 18；3 ≤ O ≤ 11）。本研究首次揭示了藻类污染水处理过程中 AOM 多样性与新型大分子 DBPs 之间的关系。
