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Molecular Size Distributions of NOM in Conventional and Advanced Water Treatment Processes  

Choi, Il-Hwan (Water Analysis and Research Center, Korea Water Resources Corporation)
Jung, Yu-Jin (Water Analysis and Research Center, Korea Water Resources Corporation)
Publication Information
Journal of Korean Society on Water Environment / v.24, no.6, 2008 , pp. 682-689 More about this Journal
Abstract
The purpose of this study was to find out the variation between molecular size distribution (MSD) of natural organic matter (NOM) in raw waters after different water treatment processes like conventional process (coagulation, flocculation, filtration) followed by advanced oxidation process (ozonation, GAC adsorption). The MSD of NOM of Suji pilot plant were determined by Liquid Chromatography-Organic Carbon Detection (LC-OCD) which is a kine of high-performance size-exclusion chromatography (HPSEC) with nondispersive infrared (NDIR) detector and $UV_{254}$ detector. Five distinct fractions were generally separated from water samples with the Toyopearl HW-50S column, using 28 mmol phosphate buffer at pH 6.58 as an eluent. Large and intermediate humic fractions were the most dominant fractions in surface water. High molecular weight (HMW) matter was clearly easier to remove in coagulation and clarification than low molecular weight (LMW) matter. Water treatment processes removed the two largest fractions almost completely shifting the MSD towards smaller molecular size in DW. No more distinct variation of MSD was observed by ozone process after sand filtration but the SUVA value were obviously reduced during increase of the ozone doses. UVD results and HS-Diagram demonstrate that ozone induce not the variation of molecular size of humic substance but change the bond structure from aromatic rings or double bonds to single bond. Granular activated carbon (GAC) filtration removed 8~9% of organic compounds and showed better adsorption property for small MSD than large one.
Keywords
Granular activated carbon (GAC); High-performance size-exclusion chromatography (HPSEC); Liquid chromatography-organic carbon detection (LC-OCD); Molecular size distribution (MSD); Natural organic matter (NOM);
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Times Cited By KSCI : 3  (Citation Analysis)
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