Characterization of aquatic humic substances to DBPs formation in advanced treatment processes for conventionally treated water

An advanced water treatment demonstration plant consisted of ozone/granular activated carbon processes was operated to study feasibility of the processes. Natural organic matter (NOM) from raw and process waters at the demonstration plant was isolated into humic and non-humic fractions by physicoche...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-05, Vol.143 (1), p.486-493
Main Authors: Kim, Hyun-Chul, Yu, Myong-Jin
Format: Article
Language:English
Subjects:
1H NMR
A253/ A203 ratio
Applied sciences
Atmospheric pollution
Chlorine - chemistry
Disinfection
Disinfection by-product (DBPs)
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
FT-IR
Humic Substances
Humic substances (HS)
Magnetic Resonance Spectroscopy
Molecular Weight
Pollution
Spectroscopy, Fourier Transform Infrared
Water Pollutants, Chemical - chemistry
Water Purification - methods
Water treatment and pollution
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Summary:An advanced water treatment demonstration plant consisted of ozone/granular activated carbon processes was operated to study feasibility of the processes. Natural organic matter (NOM) from raw and process waters at the demonstration plant was isolated into humic and non-humic fractions by physicochemical fractionation method to investigate characteristics of humic fraction (i.e., humic substances, HS) as a predominant haloform reactant. Ozone did not significantly oxidize the carboxylic fraction (from 39.1 to 35.9%), while GAC removed some of the carboxylic fraction (from 35.9 to 29.1%). Formation potential of trihalomethanes (THMs) as compared to haloacetic acids formation potential (HAAFP) was highly influenced by HS. Higher yields of THMs resulted from chlorination of HS with a higher phenolic content and phenolic fraction in the HS gradually decreased from 60.5% to 15.8% through the water treatment. The structural and functional changes of HS were identified by elemental, Fourier-transform infrared (FT-IR) and proton nuclear magnetic resonance ( 1H NMR) analyses, and these results were mutually consistent. The functional distribution data obtained by using A-21 resin could be used to support the interpretation of data obtained from the spectroscopic analyses. Decreases in ratio of UV absorbance at 253 nm and 203 nm ( A 253/ A 203) and DBPFPs/DOC showed consistent trends, therefore, A 253/ A 203 ratio may be a good indicator for the disinfection by-product formation potentials (DBPFPs).
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.09.063