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- 주제어 : $UV/H_2O_2$ 산화 (검색결과 8 건)
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사진현상폐수의 UV-자유반사 반응조에서의 UV/H<sub>2</sub>O<sub>2</sub> 고급산화처리
최경애,김영주,Choi, Kyung-Ae,Kim, Young-Ju 대한환경공학회 2000 대한환경공학회지 Vol.22 No.2
난분해성 폐수인 사진현상폐수의 $UV/H_2O_2$ 및 $H_2O_2$의 고급산화에 의한 오염물질의 제거 실험을 실시하였다. $UV/H_2O_2$ 산화에서 $H_2O_2$의 분해로 $OH^-$ 라디칼이 발생되는데 파장 190~300 nm의 UV가 반응의 촉매 역할을 한다. $OH^-$ 라디칼은 수명은 짧으나 강력한 산화력을 갖고 있는데, 이 산화력은 폐수처리에서 폐수나 액상 폐기물의 유기물질을 제거하는데 이용된다. 본 연구에서 기존의 tube형 반응조의 단점을 보완한 UV-자유반사 반응조를 제작하여 사용하였으며 UV원으로는 수은 고압램프가 이용되었다. 본 실험에서는 반응시간과 $H_2O_2$ 주입량 및 pH 변화에 따른 오염물의 처리효율의 변화를 조사하였는데 $H_2O_2$의 주입량이 증가할수록 처리효율이 높았으나 그 차이는 미미하였으며, pH 8에서 보다는 3에서 처리효율이 약간 높았으나 그 차이 역시 크지 않았다. 본 연구에서 사진현상폐수 처리의 적정 운전조건은 pH 8, $H_2O_2$ 주입량은 유입수의 COD를 기준으로 한 1.3배 화학량론적 주입으로 나타났는데, 5시간의 처리에서 $COD_{Cr}$, TOC 및 색도의 제거효율은 각각 약 47.5%, 75.0% 및 91.5%로 나타났다. 반응 후 생분해성의 지표인 BOD/COD 비는 초기 0.04에서 0.21로 약 5.3배 증가하였다. In this study, UV-catalyzed $H_2O_2$ oxidation and $H_2O_2$ oxidation to remove contaminants from photo processing chemicals were investigated at various conditions. Photo processing chemicals contains high concentrations of organic compounds and has very low biodegradability. Hydrogen peroxide is subjected to gradual decomposition as metastable substance. In the process, short-lived and highly reactive hydroxyl radicals are formed. The decomposition can be significantly accelerated by use of appropriate catalyst, such as ultraviolet radiation. The experiments were conducted in a UV-free reflecting reactor in batch and a high-pressure mercury lamp was used as UV source. Mixing, cooling and ventilation of the reactor were operated during experiments. In $UV/H_2O_2$ oxidation and $H_2O_2$ oxidation, the removal efficiencies of $COD_{Cr}$, TOC and chromaticity increased with the increase of $H_2O_2$ dosage and were higher in the controlled pH condition of 3 than in original pH condition of 8. In $UV/H_2O_2$ oxidation under the optimum condition of pH 8 and 1.3 stoichiometric $H_2O_2$ dosage, the removal efficiencies of $COD_{Cr}$, TOC and chromaticity were 47.5%, 75.0% and 91.5% respectively and $BOD/COD_{Cr}$ ratio was significantly increased from 0.04 to 0.21.
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광촉매를 이용한 Pyrazine류 화학폐수내 난분해성 물질 제거에 관한 연구
김성준 ( Sung-joon Kim ),곽규동 ( Gyu-dong Gwak ),신철호 ( Chul-hoo Sin ),정태섭 ( Tae-sub Jeong ),원찬희 ( Chan-hee Won ) 한국환경기술학회 2005 한국환경기술학회지 Vol.6 No.4
난분해성 물질들은 368nm UV가 광촉매에 조사될 때 TiO2에서 발생되는 강력한 OH 라디칼에 의해 CO2나 H2O로 광산화된다. 본 연구의 광촉매 적용은 Pyrazines 화학 폐수내 난분해성 물질들을 분해시키기 위해 광촉매를 적용하였다. 단순 TiO2에 UV만을 조사하였을 경우 유기물 제거율이 45% 정도 였으며, 더 많은 OH radical을 생성시켜 최대 산화력을 얻기 위해 펜톤산화 과정을 추가한 실험에서는 반응시작 3시간까지는 약 50%의 제거율을 보였으나 그 이후로는 제거 효율이 둔화되었다. 여기에 산화보조제로서 H2O2를 반응기에 10분간격으로 연속주입하여 실험한 결과 유기물 제거 98.8%의 제거효율을 나타내었다. H2O2의 연속주입에 따른 경제성을 고려하여 새롭게 시도된 광촉매가 코팅된 활성탄에 O3과 UV 조사 실험시 유기물 99.9%의 제거효율을 보였다. 본 연구에서 제시한 방법으로 광촉매 산화반응조를 운영한다면 화학폐수내의 난분해성 오염물질을 제거하기 위한 공정으로 활용될 수 있을 것으로 기대된다. Non-degradable materials are completely mineralized to CO<sub>2</sub> and H<sub>2</sub>O by the attack of active radical species generated from TiO<sub>2</sub>, photocatalysts when the photocatalysts are irradiated by 368nm UV light. Application method of photocatalysts is studied for decomposing non-degradable materials in pyrazines chemical wastewater. An organism oxidation test that is only used by UV is resulted in 45% removal efficiency. For the maximum oxidation ability, more OH radical is produced by Fenton Oxidation process but it is showed to about 50% removal efficiency from beginning oxidation reaction to 3 hours. After 3 hours, the removal efficiency is slowdown. When H<sub>2</sub>O<sub>2</sub>, supplementary oxidation material, is injected to pilot plant, the result of test is showed to 98.8% removal efficiency. Because of economic aspects, the new method is researched by combination of activated carbon which is coated by catalysis, O<sub>3</sub>, and UV. This process remove 99.9% of the organic matters. This process is expected in that it can be utilized to remove non-degradable materials in pyrazines chemical wastewater.
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하수처리수의 3차처리를 위한 고도산화법(AOP)의 적용성에 관한 연구
정은호 ( Eunho Chung ),정종태 ( Jongtai Jung ),한상윤 ( Sangyun Han ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.5
Ozone has been applied in combination with various processes for the tertiary treatment of municipal wastewater. However, in Korea, the ozone process is mainly employed for the reuse of tertiary treated wastewater, and an enhanced advanced oxidation process (AOP) is needed to realize the large-scale reuse of treated wastewater. In this study, various AOPs employing ozone (only ozone process, O<sub>3</sub>+H<sub>2</sub>O<sub>2</sub>, O<sub>3</sub>+UV, O<sub>3</sub>+GAC) were used to analyze the TOC, CODcr, and color treatment efficiencies of municipal wastewater and evaluate its applicability of wastewater reuse. The O<sub>3</sub>+H<sub>2</sub>O<sub>2</sub> process showed the highest TOC removal efficiency of 62.0%, while the O<sub>3</sub>+GAC and only ozone processes exhibited the TOC removal efficiencies of 58.9% and 59.3%, respectively. The TOC removal pattern of the O<sub>3</sub>+UV process was similar to that of the O<sub>3</sub>+H<sub>2</sub>O<sub>2</sub> process. The TOC removal efficiency of the O<sub>3</sub>+UV process, 61.0%, was slightly lower than that of the O<sub>3</sub>+H<sub>2</sub>O<sub>2</sub> process. The CODcr removal efficiencies of the O<sub>3</sub>+UV and O<sub>3</sub>+H<sub>2</sub>O<sub>2</sub> processes were 75.8% and 77.0%, respectively. However, the TOC and CODcr removal efficiencies were different within the error range, so there was no significant difference in the processing efficiencies of the methods investigated. The color removal efficiencies of the O<sub>3</sub>+UV (57.8%) and O<sub>3</sub>+H<sub>2</sub>O<sub>2</sub> (57.4%) processes were 57.8%, 57.4%. respectively and it showed similar pattern.
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하수 2차 처리수 재이용을 위한 저압 및 중압 고도산화시스템의 성능평가
안규홍,안석,맹승규,김기팔,홍준석,정민우,권지향,Ahmed, Zubair 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4
In the present study, the feasibility of UV/H₂O₂ systems was investigated using low and medium-pres sure lamps on biologically treated wastewater effluents for secondary effluent reclamation. Two types of UV lamps were used as the light sources (a 33W lowpressure mercury lamp and a 350-W mediumpressure mercury lamp). The results from these UV systems showed that the removal of organic compounds could be achieved in the contact time of longer than 30min (i.e., low UV doses). Efficiencies of color removal and disinfection were far better than those of organic matters measured as TOC, DOC and TCOD_(cr). In the low pressure lamp UV system, it has been found that DOC and color removals were 60.9 and 86.2% with 50㎎/L of H₂O₂ and contact times of 30 minute, respectively. Whereas, with the mediumpressure lamp UV system, TOC, DOC and color removal were 27.1, 5.6 and 95% with 14.3㎎/L of H₂O₂ and 14 minute of contact times, respectively. Both systems could be applied for the reclamation of secondary effluent treated with biological treatment processes.
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자외선/H<sub>2</sub>O<sub>2</sub> 처리시 남조류 기인 유기물 특성이 수산화 라디칼 반응성 및 운전조건에 미치는 영향
남숙현 ( Sookhyun Nam ),이주원 ( Juwon Lee ),김은주 ( Eunju Kim ),황태문 ( Tae-mun Hwang ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.4
This study interrogates the influence of algal organic matter on hydroxyl radial (ㆍOH) scavenging factors. The ㆍOH scavenging factor represents the rate at which ㆍOH is scavenged by background substances in aqueous solutions, which is key to the design and operation of UV/H<sub>2</sub>O<sub>2</sub> processes for water treatment. Extracellular organic matter (EOM) and intracellular organic matter (IOM) were extracted from cyanobacteria acquired from lake water. Synthetic water was manufactured by using either EOM or IOM, and the resulting hydroxyl radical scavenging factors were measured and compared. The organic properties of the EOM and IOM were analyzed by using liquid chromatography organic carbon detection (LC-OCD) and fluorescence excitation-emission matrices (F-FEM). Analyses revealed that EOM samples exhibited strong peaks associated with tryptophan-like, fulvic-like, and humic-like (excitation/emission 250-260/380-480) substances. By comparison, the tryptophan-like peak was dominant in IOM samples. Six components were observed in LC-OCD chromatograms, with neutrals being the highest component of both of EOM and IOM, yet EOM also had high humics and LMW acids. This study proposes a predictive model that estimates the optimal UV and H2O2 doses necessary to maximize the removal of target compounds. Removal of 90% of the target compound (D90) required 6.8 mg/L of hydrogen peroxide at 1200 mJ/㎠. When comparing theoretical prediction with experimental values, the difference in the elimination rate was less than 10%.
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