| Title |
Analysis of Taste and Odor Compounds in Drinking Water Supplies Using CLSA ( closed - loop stripping apparatus ) and GC / MS |
| Authors |
배병욱(Byung Uk Bae),김영일(Young Il Kim),김현영(Hyun Young Kim),김계남(Gye Nam Kim) |
| Abstract |
For better analysis of taste and odor (T&O) compounds in drinking water supplies, CLSA(closed-loop stripping apparatus) technique, a newly developed concentrating method, was used in combination with gas chromatography/mass spectrometry(GC/MS) and gas chromatography(GC). The recovery factors of CLSA for two typical T&O compounds, Geosmin and 2-MIB (2-methylisoborneol), were 76.3 and 58.8%, respectively. Analysis of raw water taken from Daechung water supplies showed that there was 3.4 ng/l of 2-MIB on August 17, 1998 and 78.0 ng/l of Geosmin on September 29, 1998, respectively. This result indicates that there was remarkable change in the dominant T&O compound after the heavy rainfall. When 20 ㎎/l of PAC (powdered activated carbon) was added to raw water and mixed for 20 minutes, Geosmin decreased from 78.0 to 4.85 ng/l and sensory data also decreased from 130 to 20 TON(threshold odor number). Thus, PAC could be used to cope with the T&O problems in conventional water treatment facilities. The successful analysis of T&O compounds in drinking water supplies which present in nanogram level might give a new momentum for developing more positive treatment method. In addition, the instrumental analysis in combination with sensory data might give more informations on the behavior of T&O compounds in raw water, treated water, and distribution system and on the efficiency of treatment methods(adsorption and oxidation). used for coping with T&O episode. |