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Effect of Ozonation on Removal of Dissolved Organic Matter by Granular Activated Carbon Process  

Ahn, Hyo-Won (Korea Institute of Water and Environment, Korea Water Resources Corporation)
Chae, Seon-Ha (Korea Institute of Water and Environment, Korea Water Resources Corporation)
Wang, Chang-Keun (Department of Environmental Engineering, Chungnam National University)
Lim, Jae-Lim (Korea Institute of Water and Environment, Korea Water Resources Corporation)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.6, 2008 , pp. 601-608 More about this Journal
Abstract
The objective of this study was to evaluate the effect of ozonation as pretreatment on the removal of dissolved or biodegradable organic matter(DOM or BOM), the variance of DOM fractionation, and microbial regrowth by pilot-scale granular activated carbon processes in which adsorption and biodegradability was proceeding due to long time operation. Regardless of point of ozonation applied, GAC processes with ozonation(i.e., Ozonation combined with GAC Filter-adsorber; Pre O$_3$ + F/A, Ozonation combined with GAC adsorber; Post O$_3$ + GAC) compared with GAC processes without ozonation(i.e., GAC Filter-adsorber; F/A, GAC adsorber; GAC) removed approximately 10 to 20% more of DOC, hydrophilic DOM(HPI), BDOC and AOC after long period of operation that biological activity was assumed to happen. Ozonation was not found to have a significant effect on the removal of DOC, but caused the decrease of AOC by approximately 20%. It was found that the fixed bacterial biomass on GAC media did not show a significant difference between the GAC with ozonation and GAC without ozonation as pre-treatment, whereas the HPC of column effluent was more biostable at Post O$_3$ + GAC compared with F/A or GAC.
Keywords
Granular Activated Carbon(GAC); Ozonation; Dissolved Organic Carbon(DOC); AOC(Assimilable Organic Carbon); BDOC(Biodegradable Dissolved Organic Carbon);
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