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Removal characteristics of NOMs in a slow sand filter at different media depth and operation time  

Park, Noh-Back (충북대학교 환경공학과)
Park, Sang-Min (충북대학교 환경공학과)
Seo, Tae-Kyeong (충북대학교 환경공학과)
Jun, Hang-Bae (충북대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.4, 2008 , pp. 467-473 More about this Journal
Abstract
Natural organic matter (NOM) removal by physico-chemical adsorption and biological oxidation was investigated in five slow sand filters with different media depths. Non-purgeable dissolved organic carbon(NPDOC) and $UV_{254}$ absorbance were measured to evaluate the characteristics of NOM removal at different filter depths. Removal efficiency of NOM was in the range of 10-40% throughout the operation time. At start-up of the filters packed with clean sand media, NOM was probably removed by physico-chemical adsorption on the surface of sand through the overall layer of filter bed. However, when Schumutzdecke layer was built up after 30 days operation, the major portion of NPDOC was removed by biological oxidation and/or bio-sorption in lower depth above 50 mm. NOM removal rate in the upper 50 mm filter bed was $0.82hr^{-1}$. It was about 20 times of the rate($0.04hr^{-1}$) in the deeper filter bed. Small portion of NPDOC could be removed in the deeper filter bed by both bio-sorption and biodegradation. SEM analysis and VSS measurement clearly showed the growth of biofilm in the deeper filter bed below 500 mm, which possibly played an important role in the NOM removal by biological activity besides the physco-chemical adsorption mechanism
Keywords
SSF(slow sand filter); NOM(natural organic matter); Filter depth; physico-chemical adsorption; Biological activity;
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Times Cited By KSCI : 2  (Citation Analysis)
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