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Although microfiltration (MF) and ultrafiltration (UF) processes are effective for removingpathogenic microorganisms such as Giardia and Cryptosporidium, they are relatively ineffectivefor controling organic pollutants and taste and odor materials (TOM). Thus, post-treatmentprocesses were adopted to gain control of these pollutants, including granular activated carbon(GAC), biological activated carbon (BAC = Ozone + GAC), or nanofiltration (NF).In this study, the effectiveness of post-treatment MF process was examined in pilot scaletests. Various system configurations were analyzed, including MF-GAC, MF-BAC, and MF-NF,in terms of removal efficiency and operation cost. Moreover, the post-treatments for MF werecompared with those for conventional water treatment (rapid sand filtration: RSF) to verify theassumption that there is an additional advantage for combining MF and GAC/BAC.The work was done at pilot scale using a 50 msup3/sup/day plant with submerged microfilters(Cleanfil-S20, Kolon, Korea) and a 15 msup3/sup/day plant with a conventional water treatment system.Five process combinations ran in parallel, including MF-GAC, MF-BAC, MF-NF, RSF-GAC,and RSF-BAC. Each process had the treatment capacity of 7.5 msup3/sup/day, except for MF-NFhaving the capacity of 7~10 msup3/sup/day. Raw water collected from the Han River was used as feedwater and poly-aluminum chloride was used as coagulants. Samples were taken to monitor thequalities of treated water. TOMs such as 2-MIB and geosmin was spiked into the raw water insome cases to further investigate the efficiency of these processes. Includes 3 references, table, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 5File Size: 1 file , 810 KB