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Study of a hybrid process combining ozonation and ceramic membrane for drinking water treatment (I) : manganese removal  

Jin, Kwang Ho (한국수자원공사)
Lim, Jae Lim (한국수자원공사)
Lee, Kyung Hyuk (한국수자원공사)
Wang, Chang Gun (충남대학교)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.6, 2008 , pp. 633-640 More about this Journal
Abstract
In this research, the $3.6m^3/day$ scale pilot plant consisting preozonation, coagulation, flocculation, and ceramic membrane processes was operated for long term period to evaluate the validity of ceramic membrane filtration process for treating lake water containing high concentration manganese. The higher concentration of dissolved manganese($Mn^{2+}$) was effectively oxidized to the bigger insoluble colloidal manganese ($MnO^2$) by 1~2 mg/L ozone. The colloidal manganese reacted with coagulant (poly aluminium chloride, PAC) and then formed the big floc. Ceramic membrane rejected effectively manganese floc during membrane filtration. Dissolved organic carbon(DOC) removal was dependent upon $Mn^{2+}$ concentration. While average $Mn^{2+}$ concentration was 0.43 and 0.85 mg/L in raw water, DOC removal rate in preozonation was 26.5 and 13.5%, respectively. The decrease rate of membrane permeability was faster without preozonation than with preozonation while membrane fouling decreased with NOM oxidation by ozone. In conclusion, raw water containing high concentration of manganese can be effectively treated in preozonation-coagulation-ceramic membrane filtration system.
Keywords
Ceramic membrane filtration; Preozonation; Manganese; TMP;
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