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KMID : 0382420030290050133
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Korean Journal of Environmental Health Society
2003 Volume.29 No. 5 p.133 ~ p.138
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Bacterial Growth on GAC (granular activated carbon) in a Water Purifier
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Lee Dong-Geun
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Abstract
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Comparison of water qualities, including bacterial distributions and activities, in influent and effluent of a water purifier for drinking water was done to clarify the possibility of bacterial growth on granular activated carbon (GAC) in a water purifier. GAC of two filters, before and after reverse osmosis (RO) filter as pre-GAC and post-GAC filters, were also studied. HPC (heterotrophic plate count) of effluent (7.0×10¹~6.3×10³ CFU/㎖) were higher than influent (3.5×10¹-1.9×10³CFU/㎖) in the water purifier until 50 days (summer) and after 50 days, vise versa. HPC was 10 fold higher in pre-GAC than post-GAC filter. It may represent that RO filter can’t eliminate all bacteria. Bacterial activities on GAC were 12.13~17.94㎍ INT-formazan/g-GAC/h in pre-GAC and 10.68-18.42㎍ INT-formazan/g-GAC/h in post-GAC. No pathogen was detected and Acinetobacter sp. were dominant bacteria on GAC. Moraxella, Clavibacter, Pseudomonas, and Corynebacterium sp. were also detected on GAC.
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