Application of portable online LED UV fluorescence sensor to predict the degradation of dissolved organic matter and trace organic contaminants during ozonation

WATER RESEARCH

卷:101

Article

Li, Wen-Tao^1,2  Majewsky, Marius²  Abbt-Braun, Gudrun²  Horn, Harald²  Jin, Jing¹  Li, Qiang¹  Zhou, Qing¹  Li, Ai-Min¹ 

[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210023, Jiangsu, Peoples R China

[2] Karlsruhe Inst Technol, Water Chem & Water Technol, Engler Bunte Ring 1, D-76131 Karlsruhe, Germany

关键词: Online fluorescence monitoring;    Dissolved organic matter;    Trace organic contaminants;    Ozonation;    Humic substances;   

DOI  :  10.1016/j.watres.2016.05.090

来源: Elsevier

【 摘 要 】

This work aims to correlate signals of LED UV/fluorescence sensor with the degradation of dissolved organic matter (DOM) and trace-level organic contaminants (TOrCs) during ozonation process. Six sets of bench-scale ozonation kinetic experiments incorporated with three different water matrices and 14 TOrCs of different reactivity (group I similar to V) were conducted. Calibrated by tryptophan and humic substances standards and verified by the lab benchtop spectroscopy, the newly developed portable/online LED sensor, which measures the UV280 absorbance, protein-like and humic-like fluorescence simultaneously, was feasible to monitor chromophores and fluorophores with good sensitivity and accuracy. The liquid chromatography with organic carbon detector combined with 2D synchronous correlation analysis further demonstrated how the DOM components of large molecular weight were transformed into small moieties as a function of the decrease of humic-like fluorescence. For TOrCs, their removal rates were well correlated with the decrease of the LED UV/fluorescence signals, and their elimination patterns were mainly determined by their reactivity with O-3 and hydroxyl radicals. At approximately 50% reduction of humic-like fluorescence almost complete oxidation of TOrCs of group I and II was reached, a similar removal percentage (25-75%) of TOrCs of group III and IV, and a poor removal percentage (<25%) of group V. This study might contribute to the smart control of advanced oxidation processes for the water and wastewater treatment in the future. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free