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PEROXONE(Ozone/Hydrogen Peroxide)공정에서의 부식산 분해 및 포름알데히드의 생성
김계월,이동석,Kim, Kei Woul,Rhee, Dong Seok 한국분석과학회 2001 분석과학 Vol.14 No.1
본 연구에서는 자연수 중에 존재하는 용존 유기물 중 난분해성 물질인 부식산을 효과적으로 분해 처리하기 위한 한 방법으로 PEROXONE 공정을 적용하였다. 이 공정의 적용시 $H_2O_2$의 농도, $H_2O_2$의 주입시기, 그리고 수용액의 초기 pH 및 알카리도를 변화시키며 TOC와 $UV_{254}$ 변화를 측정함으로써 부식산의 분해를 조사하였다. 동시에 GC/ECD를 사용하여 각 조건에서 생성되는 포름알데히드의 농도 변화를 살펴보았다. 이 실험을 통해 PEROXONE 공정 적용시 $H_2O_2$의 주입농도와 주입시기 그리고 초기 pH가 부식산의 제거율을 높이는데 매우 중요함을 확인하였다. 초기 $H_2O_2$ 농도가 5mg/L, $H_2O_2$ 주입시점이 5분, 초기 pH가 10.5인 강알칼리성 영역에서 TOC 제거율이 가장 높았으며 수중에 알칼리도가 존재할 경우에는 유기물 분해율이 감소하였다. 반응 중 생성되는 포름알데히드의 농도는 오존단독 처리에 비해 PEROXONE 공정에서 더 낮게 나타났으며, 본 연구에서 실험한 pH 영역 중 pH 5.0에서 상대적으로 많은 포름알데히드가 생성되었다. This research was studied the action of the coupling ozone-hydrogen peroxide on aqueous humic acid. PEROXONE process is enhanced the generation of hydroxyl radicals which is effective for degradation of organic matters. Therefore the changes of $UV_{254}$ and TOC were investigated through the change of concentrations, injection time of $H_2O_2$, initial pH of aqueous humic acid and concentrations of radical savenger as $HCO_3{^-}$ in the PEROXONE processes. And the GC/ECD was used to detect the formaldehyde formed by ozonation of humic acid. From the experimental results, concentrations and injection time of $H_2O_2$ and initial pH in solution in the PEROXONE processes were very important for enhancing the efficiency of degradation in humic acid. The results indicated that removal efficiency of TOC was the highest when concentration of $H_2O_2$ was 5mg/L, injection time of $H_2O_2$ was 5 minutes and initial pH in solution was 10.5. And presence of alkalinity in solution was reduced the efficiency of treatment. The formaldehyde were formed less PEROXONE processes than only ozone. When initial pH in solution were changed from 3.5 to 10.5, the formaldehyde were formed highest concentration at pH 5.
UV/H_2O_2, UV/TiO_2 시스템에서 염료의 색도 및 COD 제거
김계월,박정미,심수진,이희정,이동석 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A
The Photocatalytic decolorization and degradation of commercial dyes were studied using a batch reactor. Degussa P25 titanium dioxide and H_2O_2 were used as the photocatalyst and proved to be effective for dyes degradation when they were irradiated with UV light. The light source was a 20W low pressure mercury lamp. Three different kinds of dyes, such as direct dye(congo red), acid dye(acid black) and disperse dye(disperse blue) were tested. Extending the UV only treatment up to 120min, direct dye was decolorized to 60% and degraded to 30% as COD. On the other side, acid and disperse dyes were eliminated less than 10% as color and COD. But, color and COD were eliminated about 90% for all of the three dyes by UV/H_2O_2 system. And then the most effective decolorization was done for direct dye with 96% removal efficiency by UV/TiO_2 system at 120min 500mg/L of TiO_2.