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 7):34-41.
Evolution of Dissolved Organic Matter Molecular Properties Analyzed by FT-ICR MS in Water Treatment Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
7 7
Page:
34-41
Column:
Date of publication:
2021-04-01
- Keywords:
- dissolved organic matter（DOM）; molecular characteristics; FT-ICR MS; water treatment process
- 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.
Last Update:
2021-04-01