XU Hang,WEN Xin,WANG Yue-ting,et al.Evolution of Dissolved Organic Matter Molecular Properties Analyzed by FT-ICR MS in Water Treatment Process[J].China Water & Wastewater,2021,37(7):34-41.
基于FT-ICR MS分析水处理中DOM分子特性的演变
- Title:
- Evolution of Dissolved Organic Matter Molecular Properties Analyzed by FT-ICR MS in Water Treatment Process
- 关键词:
- 溶解性有机物; 分子特性; 傅里叶变换离子回旋共振质谱法; 水处理工艺
- Keywords:
- dissolved organic matter（DOM）; molecular characteristics; FT-ICR MS; water treatment process
- 摘要:
- 研究了溶解性有机物（DOM）在水厂全流程处理工艺中的演变，并利用FT-ICR MS技术深入分子层面探究小分子DOM的分子组成、质荷比、芳香性等变化。结果表明，DOM总浓度呈下降趋势，小分子DOM（分子质量<1 ku）在水厂中占比最大且去除效果最差。小分子DOM中CHO-DOM（仅含C、H、O，占比为48.75%~53.13%）的多样性和相对丰度占主导地位，木质素/CRAM类化合物（68.12%~72.05%）占显著优势。预氯化对小分子DOM的去除量低、生成量高，混凝沉淀对CHO-DOM和CHON-DOM（仅含C、H、O、N）有较好的去除效果，普通砂滤和生物活性炭过滤对DOM的影响较小，加氯消毒工艺影响最大，去除了大量芳香性/不饱和度高的小分子DOM，CHO-DOM的相对丰度趋于平缓，CHON-DOM中C13H20NO9跃升至最大丰度，CHOS-DOM（仅含C、H、O、S）的相对丰度明显增加，出现多个突出的高H/C化合物。总体上小分子DOM向高H/C、低O/C转移，出水中碳水化合物类、单宁酸类占比下降，稠环化合物类基本被去除，脂质类、类蛋白类和木质素/CRAM类占比增加，小分子DOM的芳香性或不饱和度大大降低。
- Abstract:
- Evolution of dissolved organic matter (DOM) in the whole process of a water treatment plant was explored, and variations in molecular composition, mass-to-charge ratio and aromatics of small molecule DOM were further analyzed by FT-ICR MS at the molecular level. Profile of total concentration of DOM was a downward trend, and the small molecule DOM (molecular weight <1 ku) accounted for the largest proportion in the water treatment plant and its removal effect was the weakest. The diversity and relative abundance of CHO-DOM (only containing C, H and O, which accounted for 48.75%-53.13%) predominated, and the lignin/CRAM compounds (68.12%-72.05%) had the largest proportion in small molecule DOM. Pre-chlorination had low removal efficiency and high generation of small molecule DOM. Coagulation-sedimentation had good removal effect on CHO-DOM and CHON-DOM. Ordinary sand filtration and biological activated carbon filtration had little influence on small molecule DOM, while chlorination disinfection had the greatest influence on small molecule DOM. Chlorination disinfection process removed a large number of small molecule DOM with high aromatic/unsaturated degree. Variations in the relative abundance of CHO-DOM tended to be stable. The relative abundance of C13H20NO9 in CHON-DOM became the maximum. The relative abundance of CHOS-DOM increased significantly and multiple prominent high H/C compounds appeared. On the whole, DOM with small molecules transferred into compounds with high H/C and low O/C. The proportion of carbohydrates and tannis in the effluent was reduced, the polycyclic aromatic hydrocarbon compounds were basically removed, the proportion of lipids, proteinaceous and lignin/CRAM was increased, and the aromatic or unsaturation of small molecule DOM was greatly reduced.
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