오존(O3)입상활성탄(GAC) 공정을 이용한 맛냄새 …

1 , 26 , 2 , , 4 , 2012 .. 237 (O3). (GAC) . Evaluation of Removal Characteristics of Taste and Odor causing Compounds and Organic matters using Ozone/Granular Activated Carbon(O3/GAC) Process 1 . 1 . 2 . 2 . 2 . 3 . 1*Young Wan Gil Keun Wook Ki Goo Kim3 Seung Kwan Hong1 1 2 3 ( ) (2012 1 20 ; 2012 4 10 ; 2012 4 12 )AbstractThis study assessed the removal characteristics of taste and odor causing compounds (2-methylisoborneol and geosmin) and organic matters, using a pilot-scale ozone/granular activated carbon (O3/GAC) process treating surface water of Pal-dang reservoir in the Han river over a 3-month period. Experiments were conducted to verify the removal efficiency of O3/GAC process which has two different empty bed contact time (EBCT) (O3/GAC column 1 : 10 min and 2 : min) with min contact time of ozonation at mg/L O3.

2 Spiking test using geosmin and 2-MIB was also conducted systematically to mimic the conditions when the algae appears, specifically at the levels similar to the concentrations experienced (geosmin: 250 ng/L) in the winter of 2011. In single ozonation process, organic materials, disinfection by-products (DBPs) and their precursors were disassembled but not removed completely. Meanwhile, it was verified that organic matters, taste and odor causing compounds, and DBPs were well removed when sequentially passing through the GAC process. The pilot results also showed that GAC column with larger EBCT achieved higher removal efficiency. Specifically, in spiking tests, single O3 process showed approximately 89% removal efficiency of geosmin and 2-MIB.

3 O3/GAC combined process demonstrated excellent removal of geosmin and 2-MIB, which are higher than 95%. Key words : Geosmin, Granular activated carbon (GAC), Organic matters, Ozonation, 2-Methylisoborneol (2-MIB)1.. , 20~30 . , 2011 .. , 11 .. 2-MIB geosmin , geosmin 2-MIB . 20 ng/L (Lloyd, 1998).*Corresponding author Tel: +82-2-929-3910, Fax: +82-2-928-7656, E-mail: Journal of Korean Society of Water and , , , April, 2012 (O2) (GAC) Journal of Korean Society of Water and , , , April, 2012238.

4 (Bruce, 2002), 2015 14 . 10 (O3/GAC) , . (Ozonation process), (Advanced Oxidation Process, AOP), (Granular activated carbon, GAC) , (Biological activated carbon, BAC) , (Membrane filtration) , . O3/GAC pilot-plant . ( , 2007) , pilot-plant O3/GAC GAC (Dissolved organic carbon, DOC) .. (Empty bed contact time, EBCT) .. GAC BAC(Biological activated carbon) ( , 2000) , O3/GAC pilot-plant EBCT 4 18 TOC, UV254 , THMs EBCT.

5 , GAC BAC 20 cm~320 cm TOC, THMs, KMnO4 , GAC BAC . , O3/GAC . GAC BAC . GAC , DOC GAC 2-MIB , (Disssolved organic matter, DOM) 2-MIB GAC . , DOC 2 mg/L 3 (Ahn, 2007). 2-MIB geosmin , 2-MIB geosmin (Ho, 2010) .. (Ho, 2010) (Rangel-Mendez, 2005) , . O3/GAC , O3/GAC.

6 , , ( , 2004), . O3/GAC . , , 26 , 2 , , 4 , 2012 .. 239 EBCT . O3/GAC pilot-plant .. GAC EBCT , . 2-MIB geosmin 2-MIB 41 84 ng/L, geosmin 48 270 ng/L (Spiking-test) .. 2. O3/GAC pilot-plant , EBCT.

7 Pilot-plant 2011 7 4 , . , . geosmin 2-MIB , 2-MIB geosmin (O3/GAC) . pilot-plant Table 1. pH ~ , ~ NTU, ~ mg/L , , pH.. [ ] pH [NTU]alkalinity[mg/L as CaCO3] 1. Pilot-plant Pilot-plant Fig. 1 2 , (O3), (GAC) , EBCT .Fig 1. Pilot-plant Pilot-plant GAC 1 GAC 2.

8 GAC 1 2 GAC , Table 2 . (O2) (GAC) Journal of Korean Society of Water and , , , April, 2012240 [mm] 1,500 1,700 H 1 310 6,000 H 1 W 1,100 L 1,000 H 1,000 1 400 5,500 H 2 W 1,000 L 1,000 H 1,200 1 Table 2. Pilot-plant Pilot-plant Table 3 . 6% 64 m3/day , 60m3/day , GAC 1 2 30m3/day . 60 m3 / day m m 1 mg / L min 30 m3/day m m m2 GAC 1 GAC 2 m3 m3 min10 min (LV) m /hr + m/min (15 L/min) m/min (30 L/min)Rinse m/min (60 L/min) 1 min + 3 min Rinse10 minDrain1 minTable 3.

9 Pilot-plant mg/L 1mg/L TOC , . , , C pilot-test . EBCT 5 15 , GAC 1 EBCT 15 min , EBCT GAC 2 EBCT 10min . A/B m/hr , Noritz (Noritz GAC 1240) . pilot-plant 12 , 2011 6 29 9 23 4 . Table 4 . 1 m , NTU.

10 ItemPropertiesunitIodine numbermin. 1,020-Molasses number(USA)min. 230-Abrasion number (AWWA method)min. 75-Particle size > 12 mesh ( mm)max. 5mass %Particle size > 12 mesh ( mm)max. 4mass %Moisture (as packed)max. 2mass %Methylene blue adsorption22g / 100 gTotal surface area ( )1,175m2 / gApparent density480kg / m3 Density backwashed and drained420kg / m3 Ball-pan hardness97-Uniformity content7mass %Water soluble %pHAlkaline-Dechlorination having 4. , 26 , 2 , , 4 , 2012 .. Pilot-plant , pH, , 6 , geosmin, 2-MIB, DOC, TOC, UV254, KMnO4, SUVA, THMs, HAAs, THMs-FP, HAAs-FP 1 . Standard method , Table 5 . pH pH-meter HACH-2100AN Turbidimeter(HACH) -TOCU ltraviolet and photocatalystTOC Analyzer(SHIMADZU)DOCUV254 Standard methodDR 5000 Spectrophotometer (HACH)KMnO4 - THMs THMs-FP GC-MS Tekma 3000 P&TAgilent 5975c GC/MS HAAs HAAs-FPLLC- Varian cp-3800 GC/ECDG eosminSPME-GC/MS GC(7890A)/MS(5975C)(Agilent Technologies)2-MIBT able 5.