Effects of ozonation and coagulation on effluent organic matter characteristics and ultrafiltration membrane fouling |
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Authors: | Kwon Jeong Dae-Sung Lee Do-Gun Kim and Seok-Oh Ko |
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Institution: | Department of Civil Engineering, Kyung Hee University, Yongin 446-701, Korea;Institute of Construction Technology, KUMHO Engineering & Construction, Yongin 449-822, Korea;Department of Civil Engineering, Kyung Hee University, Yongin 446-701, Korea;Department of Civil Engineering, Kyung Hee University, Yongin 446-701, Korea |
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Abstract: | Effluent organic matter (EfOM) is the major cause of fouling in the low pressure membranes process for wastewater reuse. Coagulation and oxidation of biological wastewater treatment effluent have been applied for the fouling control of microfiltration membranes. However, the change in EfOM structure by pre-treatments has not been clearly identified. The changes of EfOM characteristics induced by coagulation and ozonation were investigated through size exclusion chromatography, UV/Vis spectrophotometry, fluorescence spectrophotometry and titrimetric analysis to identify the mechanisms in the reduction of ultrafiltration (UF) membrane fouling. The results indicated that reduction of flux decline by coagulation was due to modified characteristics of dissolved organic carbon (DOC) content. Total concentration of DOC was not reduced by ozonation. However, the mass fraction of the molecules with molecular weight larger than 5 kDa, fluorescence intensity, aromaticity, highly condensed chromophores, average molecular weight and soluble microbial byproducts decreased greatly after ozonation. These results indicated that EfOM was partially oxidized by ozonation to low molecular weight, highly charged compounds with abundant electronwithdrawing functional groups, which are favourable for alleviating UF membrane flux decline. |
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Keywords: | effluent organic matter fouling ultrafiltration oxidation molecular weight distribution acidity |
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