Removal of Musty Odor Compound in Drinking Water by Biological Filter

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Abstract
In order to remove the musty odor compound 2-methyl isoborneol (MIB) from drinking water resources at Lake Biwa, a pilot plant of a biological filtration was installed and operated. In this study, the effects of water temperature, pH and initial concentration of MIB on the MIB degradation potential of the ceramic media packed column in the biological filter were studied. Microorganisms on the surface of the granular media were observed under the scanning electron microscope (SEM). Bacteria which were responsible for the degradation were isolated, studied and identified. From this experiment, the extent of the effect of water temperature on the degradation potential was found to be similar to that on the biochemical oxygen demand (BOD) removal activity by an activated sludge. The optimum pH for the degradation potential was seen to be between 7 and 9. The MIB degradation reaction was seen to be almost a first order reaction. On the surface of the washed granular media, coccoid and rod-shaped bacteria were observed. Eleven out of 34 bacteria isolated from the washed media were judged as biodegraders. Some characteristics of 7 Gram negative biodegraders were studied and two strains of Pseudomonasaeruginosa,one strain of Flavobacteriummultivorum, one strain of Pseudomonas sp. and one strain of Flavobacterium sp. were identified.

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