• Title/Summary/Keyword: Ozone($O_3$)

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Development of the DIW-$O_3$ Cleaning Technology Substituted for the Semiconductor Photoresist Strip Process using the SPM (SPM을 이용한 반도체 포토레지스트 제거 공정 대체를 위한 DIW-$O_3$ 방식 세정기술 개발)

  • Son, Yeong-Su;Ham, Sang-Yong
    • 연구논문집
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    • s.33
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    • pp.99-109
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    • 2003
  • Recently the utilization of the ozone dissolved de-ionized water(DIW-$O_3$) in semiconductor wet cleaning process and photoresist stripping process to replace the conventional sulfuric acid and hydro peroxide mixture(SPM) method has been studied. In this paper, we propose the water-electrode type ozone generator which has the characteristics of the high concentration and purity to produce the high concentration DIW-$O_3$ for the photoresist strip process in the semiconductor fabrication. The proposed ozone generator has the dual dielectric tube structure of silent discharge type and the water is both used to electrode and cooling water. Through this study, we obtained the results of the 10.3 wt% of ozone gas concentration at the oxygen gas of 0.5 [liter/min.] and the DIW-$O_3$ concentration of 79.5 ppm.. Through the photoresist stripping test using the produced DIW-$O_3$, we confirmed that the photoresist coated on the silicon wafer was removed effectively in the 12 minutes.

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A Study on the Lamp Type Ozonizer (Lamp 형 오존발생기에 관한 연구)

  • Kang, Cheon-Su;Song, Hyun-Jig;Lee, Kwang-Sik;Lee, Dong-In
    • Proceedings of the KIEE Conference
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    • 1995.07c
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    • pp.1407-1409
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    • 1995
  • This paper describes ozone concenteration($O_{3con}$), ozone generation($O_{3g}$) and ozone yield($O_{3Y}$) of lamp type ozonizer which be performed a role of lighting source and ozonizer. OLamp is consist of two of low pressure mercury lamps. The important conclusions obtained from this paper are as follows, The more quality of supplied gas(Q) decrease, the higher $O_{3con}$ rise. The more quality of supplied gas(Q) increase, the higher $O_{3g}$ some rise. When supplied oxygen 10[l/min] obtained 4,010[mg/kwh] $O_{3Y}$. The Echerichia coli which is reacted on ozone can be sterilized about 95[%].

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Disinfection by Ozone Microbubbles Can Cause Morphological Change of Fusarium oxysporum f. sp. melonis Spores

  • Tamaki, Masahiko;Kobayashi, Fumiyuki;Ikeura, Hiromi;Sato, Michio
    • The Plant Pathology Journal
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    • v.34 no.4
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    • pp.335-340
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    • 2018
  • To investigate the difference in the disinfectant efficiency of ozone microbubbles ($O_3MB$) and ozone millibubbles ($O_3MMB$), the morphological change of the treated Fusarium oxysporum f. sp. melonis spores was observed with scanning and transmission electron microscopies (SEM and TEM). The disinfectant efficiency of $O_3MB$ on F. oxysporum f. sp. melonis spores was greater than that of $O_3MMB$. On observation with SEM, it was revealed that morphological change of F. oxysporum f. sp. melonis spores was caused by $O_3MB$ and $O_3MMB$, and damage to the spore surfaces by $O_3MB$ occurred sooner than that by $O_3MMB$. On observation with TEM, it was furthermore confirmed that F. oxysporum f. sp. melonis spores treated with $O_3MB$ induced wavy deformation of cell membrane and the intracellular change different from that with $O_3MMB$. Therefore, the greater disinfection efficiency of $O_3MB$ was suggested to be caused due to the function of the MB in addition to the oxidative power of $O_3$.

A Study on Removal of Phenol and Its By-Product by Ozone, Ozone/Hydrogen Peroxide and Ozone/Granular Activated Carbon (오존, 오존/과산화수소와 오존/활성탄 처리에 의한 페놀 및 그 부산물의 제거에 관한 연구)

  • 배현주;김영규;정문호
    • Journal of Environmental Health Sciences
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    • v.23 no.3
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    • pp.121-129
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    • 1997
  • This study was performed to delineate the removal phenol in solutions using of ozone, ozone/$H_2O_2$ and ozone/GAC. The disinfection by-product of phenol by ozonation, hydroquinone, was analyzed and it's control process was investigated. The followings are the conclusions that were derived from this study. 1. The removal efficiency of phenol by ozonation was 58.37%, 48.34%, 42.15%, and 35.41% which the initial concentration of phenol was 5 mg/l, 10 mg/l, 15 mg/l, and 20 mg/l, respectively. 2. The removal efficiency of phenol by ozonation was 42.95% at pH 4.0 and 69.39% at pH 10, respectively. The removal efficiencies were gradually increased, as pH values were increased. 3. With the ozone/$H_2O_2$ combined system, the removal efficiency of phenol was 72.87%. It showed a more complete degradation of phenol with ozone/$H_2O_2$ compared with ozone alone. 4. When ozonation was followed by filtration on GAC, phenol was completely removed. 5. Oxidation, if carried to completion, truly destroys the organic compounds, converting them to carbon dioxide. Unless reaction completely processed, disinfection by-products would be produced. To remove them, ozone/GAC treatment was used. The results showed that disinfection by-product of phenol by ozonation, hydroquinone, was completely removed. These results suggested that ozone/GAC should also be an appropriate way to remove phenol and its by-product.

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A Study on the Characteristics of the High Concentration Ozone Generator for the Semiconductor Wafer Cleaning with the Ozone Dissolved De-ionized Water (반도체 웨이퍼의 오존 수(水) 세정을 위한 고농도 오존발생장치 특성 연구)

  • 손영수;함상용;문세호
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.52 no.12
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    • pp.579-585
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    • 2003
  • Recently the utilization of the ozone dissolved de-ionized water(DI-O3 water) in semiconductor wet cleaning process to replace the conventional RCA methods has been studied. In this paper, we propose the water-electrode type ozone generator which has the ozone gas characteristics of the high concentration and high purity to produce the high concentration DI-O3 water for the silicon wafer surface cleaning process. The ozone generator has the dual dielectric tube structure of silent discharge type and the water is both used to electrode and cooling water. We investigate the performance of the proposed ozone generator which has the design goal of the concentration of 7[wt%] and ozone generation quantity of 6[g/hr] at flow rate of 1[$\ell$/min). The experiment results show that the water electrode type ozone generator has the characteristics of 8.48[wt%] of concentration, 8.08[g/hr] of generation quantity and 76.2[g/kWh] of yield and it's possible to use the proposed ozone generator for the DI-O3 water cleaning process of silicon wafer surface.

Evaluation of Applicability and Economical Efficiency of Peroxone Process for Removal of Micropollutants in Drinking Water Treatment (정수처리에서 미량유해물질 제거를 위한 Peroxone 공정의 적용성 및 경제성 평가)

  • Son, Hee-Jong;Kim, Sang-Goo;Yeom, Hoon-Sik;Choi, Jin-Taek
    • Journal of Environmental Science International
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    • v.22 no.7
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    • pp.905-913
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    • 2013
  • We compared the applicability and economical efficiency of peroxone process with those of ozone process in the existing water treatment plant on downstream of Nakdong River. After comparing the peroxone process for removing geosmin with the ozone process in lab scale test, peroxone process showed much higher removal efficiency than the ozone process at the same ozone dosage. Proper range of $H_2O_2/O_3$ ratio were 0.5~1.0 and the half-life of geosmin was about 5.5~6.8 min when the $H_2O_2/O_3$ ratio was set to 0.5 during 1~2 mg/L of ozone dosage. Peroxone process could reduce the ozone dosage about 50 to maximum 30% for the same geosmin removal efficiency compared to the ozone process in the pilot scale test. In case of 1,4-dioxane treatment, peroxone process could have 3~4 times higher efficiency than ozone process at the same ozone dosage. The results of estimating the economical efficiency of ozone and peroxone process for treating geosmin and 1,4-dioxane by using pilot scale test, in case of the removal target was set to 85% for these two materials, the cost of peroxane process could be reduced about 1.5 times compared to ozone process, and in the same production cost peroxone process could have 2~3 times higher removal efficiency than ozone process. The removal efficiency by peroxone process showed a large difference depending on the physicochemical characteristics of target materials and raw water, therefore detailed examination should be carried out before appling peroxone process.

Change of Microbial Community on Ozonation of Sewage Sludge to Reduce Excess Sludge Production (폐슬러지 감량화 및 재활용을 위한 오존 처리시 하수슬러지내의 미생물 군집구조의 변화)

  • Hong, Jun-Seok;Lim, Byung-Ran;Ahn, Kyu-Hong;Maeng, Sung-Kyu
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.1
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    • pp.59-65
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    • 2004
  • The change of the microbial community structure in excess sludge of different sewage treatment plants by ozone treatment was investigated by quinone profiles. The resulting ozone dosage ranged from 0.1 to $0.4gO_3/gTS$. In terms of overall sludge reduction, more than 50% reduction of the total sludge mass could be achieved by ozone treatment at $0.4gO_3/gTS$. Quinone concentration and type in sludge of different treatment plants were remarkably decreases with increasing ozone dose. Ubiquinones(UQs)-8, -10 and MK-8 were still remained in the ozonized sludge at $0.4gO_3/gTS$. The results of this study showed that the remaining microorganisms belong to UQs-8, -10 and MK-8 were difficult to destruct cell membrane or wall by ozonation. Fecal Streptococci and Salmonella were not detected at ozone dose of $0.2gO_3/gTS$, but Fecal Coliform was not detected at ozone dose of $0.4gO_3/gTS$.

The Effect of Ozone of the Improvement of Dehydration in Treatment of Sewage Sludge Measuring SRF (SRF측정에 의한 하수슬러지의 탈수 개선을 위한 오존 효과)

  • 황상용;손종렬;이용성
    • Journal of Environmental Health Sciences
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    • v.19 no.4
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    • pp.44-50
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    • 1993
  • This paper has concentrated on estimating the improvement of sludge dewaterability for the application of ozone in sewage treatment plant sludge. The experiment for the study was conducted by batch reactor, contacting ozone (5.0 g O$_3$/hr/l) to waste sludge and measured the Specific Resistance to Filtrate (SRF) varying pH, pressure and reaction time of ozone. And then checked the dissolved solids concentration of flitrate. The results of experiment were as follows: 1. When the total solids concentration of excess sludge was 9, 000 mg/l, the optimum injection rate of ozone was 5.0 g O$_3$/hr/l, and then pressure was 50 cm Hg for the measuring SRF. 2. In the range of pH 3~5, the effect of ozone injection was excellent, but it was unsatisfactory in the range of pH 9~11. Therefore, the ozone injection by acidifying pH level was effective in improving the dewaterability of sludge. 3. It was estimated that the dissolved solids concentration of flitrate was increased in proportion to the injection rate of ozone.

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Formation behaviour of Bromate in Processes of Advanced Water Treatment System using Nakdong river water (고도정수처리 공정에서 브로메이트의 거동 평가)

  • Kim, Young-Jin;Hyun, Kil-Soo
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.4
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    • pp.605-610
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    • 2011
  • The objectives of this study are to investigate a bromate behaviour in the processes of advanced water treatment system (AWTS: preozonation, coagulator-settler, rapid sand filter, postozonation, biological activated carbon (BAC) beds) and to investigate the effects of ozonation, pH and ammonia nitrogen on bromate (${BrO^-}_3$) formation. As a result, $BrO_3$ was not detected in the processes of the AWTS without ozonation, while it was detected in a preozonated and postozonated water. For $BrO_3$ formation during June to November, the $BrO_3$ concentration of <9.4${\mu}g/L$ was observed in postozonated water, while it was reduced to about 46% by BAC beds. When applied ozone dosage and ozone contact time for influent with $Br^-$ of <0.3mg/L were 0.5-2.0mg/L.min and 10 min., $BrO_3$ concentration increased with increasing ozone dosage. Longer contact time and lower ozone level also was needed to inhibit the formation of $BrO_3$. At ozone dosage of 1.4 mg/L.min, the formation rate of $BrO_3$ increased with increase of pH value. When $NH_4-N$ concentration increased from 0.1mg/L to 0.4mg/L, $BrO_3$ concentration decreased to about 38%. These results revealed that $BrO_3$ concentration increased with increasing Br level, ozone dosage, and pH value, while it decreased with increase of $NH_4-N$ concentration.

Development of Activated Graphite Felt Electrode Using Ozone and Ammonia Consecutive Post Treatments for Vanadium Redox Flow Batteries (오존, 암모니아 순차적 처리를 통한 바나듐 레독스 흐름 전지용 활성화 카본 펠트 전극 개발)

  • CHOI, HANSOL;KIM, HANSUNG
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.4
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    • pp.256-262
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    • 2021
  • A carbon felt electrode was prepared using ozone and ammonia sequential treatment and applied as an electrode for a vanadium redox flow battery (VRFB). The physical and electrochemical analyses demonstrate that the oxygen groups facilitate nitrogen doping in the carbon felt. Carbon felt (J5O3+NH3), which was subjected to ammonia heat treatment after ozone treatment, showed higher oxygen and nitrogen contents than carbon felt (J5NH3+O3), which was subjected to ammonia heat treatment first and then ozone treatment. From the charging/discharging of VRFB, the J5O3+NH3 carbon felt electrode showed 14.4 Ah/L discharge capacity at a current density of 150 mA /cm2, which was 15% and 33% higher than that of J5NH3+O3 and non-activated carbon felt (J5), respectively. These results show that ozone and ammonia sequential treatment is an effective carbon felt activation method to increase the performance of the vanadium redox flow battery.