• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.215-216
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• 2003

대기환경에 대한 오존의 영향이 증대되면서 오존에 대한 관심이 증대되었다. 이에 따라 대기중 오존 농도를 정확히 측정할 수 있는 오존 측정기에 대한 관심도 고조되고 있는 실정이다. 오존을 측정하기 위한 방법은 분석하는 방법에 따라 Ion Chromatography, UV/Vis Spectrometer, Spectrofluorimeter, Spectrometer(reflection)방법 등을 들 수 있으며(Zhou and Smith, 1997, Geyh etal. 1997), 이들 중 Spectrometer(reflection)를 이용하는 방법이 비교적 간단하다. 이 방법은 대기 중 오존과 반응하여 색도가 변화하는 착색제를 사용하여 색도 변화를 관측하여 오존 농도를 평가하는 방법이다. (중략)

• Korean Journal of Food Science and Technology
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• v.47 no.5
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• pp.586-592
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• 2015

This study was performed to determine optimum approaches for control of microorganisms in school refectories and kitchens. A reduction of more than 5.0 log CFU/mL was noted for Escherichia coli O157:H7, Salmonella Typhimurium, Listeria monocytogenes, Staphylococcus aureus, and Streptococcus mutans after treatment with 5 ppm ozone water for 60 s. Treatment of different vegetables with ozone water for 5 min showed bactericidal effects with 2-4 log reduction of viable cell number; the bactericidal effects differed according to the kinds of vegetables. The viable cell number on kitchen apparatus and tableware was not detected by ozone water treatment for 60 s. In addition, the count of the bacteria floating in the air in refectories and kitchens decreased 2.0 log CFU/1,000 L air to 0-1 CFU/1,000 L air on treatment with 45 ppm ozone gas for 12 hr. Therefore, ozone water and ozone gas may be good candidates as antimicrobial agents that can be used to improve sanitary conditions in school refectories and kitchens.

• Journal of Bio-Environment Control
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• v.31 no.1
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• pp.35-42
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• 2022

To investigate the effects of ozonated water concentration and soaking time on adventitious root formation of willow, we studied the efficiency of root cuttings in the revegetation technology of biological engineering of willows. The ozonated water concentrations were used for 5 minutes and 2 hours at 1, 5, 10, 15, 20 ppm by soaking method and then the shoot characteristics were observed. The number and length of adventitious roots were determined. The results indicated that 20 ppm of ozonated water for 2 hours and 1 ppm of ozonated water for 5 minutes resulted in leaves turned wither away and no adventitious root production. Considering the appearance, number and length of the adventitious root, soaking willow cuttings into the ozonated water with dissolved ozone concentration, 5 ppm for 2 hours and 10-15 ppm for 5 minutes were suitable for generating adventitious roots.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.10
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• pp.549-555
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• 2017

The purpose of this study is to investigate how ozone-dissolution-tank structure affects micro-ozone-bubble distribution, energy consumption and water treatment efficiency. The partition walls inside the ozone-dissolution-tank generate pressure changes, shear forces, and swirling flows, which change the size of the bubble diameter. The size of the bubble diameter differs by 10.5% depending on the partition walls. Changes in ozone-bubble diameter are related to energy consumption. As the ozone-bubble becomes smaller, the bubble generation energy increases, but the ozone production energy decreases as the dissolution efficiency increases. Therefore, an ozone-dissolution-tank should be determined by means of an optimal condition producing a micro-ozone-bubble with a minimum sum of bubble generation energy and ozone production energy. The energy consumed to inject the same amount of ozone into the effluent differs by 2.5% depending on the partition walls. However, considering the water treatment efficiency, the conditions for selecting the ozone-dissolution-tank are variable. This is because the free radicals that increase as the ozone-bubble gets smaller are very efficient for water treatment. Even at the same ozone injection concentration, the water treatment efficiency differs by 10.4% according to the partition walls. Therefore, we have studied ozone-dissolution-tank structure which produces reasonable ozone-bubble considering water treatment efficiency and energy efficiency.

• Journal of the Korean Applied Science and Technology
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• v.34 no.2
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• pp.394-399
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• 2017

The goal of this study is to suggest the technology and the way of developing ergonomic shampoo device, which is able to adjust the height and to be devided, and it uses ozone water. As a result of developing the device, it can complete better the effect of preventing water splash than existing devices by making neck holding part higher. And it is also made with ergonomic design, therefore, the head of shampoo candidate can be drawn into it more easily. By adjusting water temperature($38^{\circ}C$) to candidate's taste through water heater attached to water bucket, when a candidate is being shampooed, it can help keep warm shampooing without delaying. We could know the process through temperature sensor. And we could also know the utility of its own sterilization(1PPM) and purification. Finally, ozone water was measured for 20 minutes and the ozone concentration was measured to be less than 1 PPM to ensure stability. All parts of the mobile shampoo stand together with the hot water device and the ozonated water conversion device were designed so as not to be inconvenient for the user to use.

• Korean Journal of Materials Research
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• v.8 no.6
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• pp.532-537
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• 1998

The purpose of this study was to investigate the behavior of ozone in DI water and the reaction with wafers during the semiconductor wet cleaning process. The solubility of ozone in DI water was not only dependent on the temperature but also directly proportional to the input concentration of ozone. The lower the initial ozone concentration and the temperature, the longer the half-life time of ozone. The reaction order of ozone in DI water was calculated to be around 1.5. The redox potential reached a saturation value in 5min and slightly increased as the input ozone concentrations increased. The completely hydrophilic surface was created in Imin when HF etched silicon wafer was cleaned in ozonized DI water containing higher ozone concentrations than 2ppm. Spectroscopic ellipsometry measurements showed that the chemical oxide formed by ozonized DI water was measured to be thicker than that by piranha solution. The wafers contaminated with a non-ionic surfactant were more effectively cleaned in ozonized DI water than in piranha and ozonized piranha solutions.

• Food Science and Preservation
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• v.8 no.4
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• pp.379-384
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• 2001

This study was conducted to investigate the changes in quality of soybean sprouts grown by ozone treatment during storage. Soybean spouts were cultivated under conditions of ozone water watering after soaking in water (W/W), watering after soaking in ozone water (O/W), ozone water watering after soaking in water (W/O) and ozone water watering after soaking in ozone water (O/O). The ozone concentration in soaking of soybean and watering of soybean sprouts was 0.3 ppm, respectively. No significant difference in shelf-life between W/W soybean sprouts and ozone treated samples showed. But shelf-life of soybean sprouts stored in 0.01 ㎜ polyethylene film at 10$\^{C}$ and 20$\^{C}$ prolonged 4 and 2 days, respectively. The slow growth of total microbe in the ozone treated samples stored at 10$\^{C}$ was observed, whereas that of products at 20$\^{C}$ showed rapid growth during storage. However, no great difference occurred among samples in the changes of moisture, vitamin C and chlorophyll content during storage. Higher hardness of soybean spouts stored at 10$\^{C}$ and 20$\^{C}$ was kept in the O/W and W/O products. Color, flavor and overall acceptability evaluated by sensory teat during storage had higher scores in O/W products as compared to the other samples.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1997.10a
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• pp.67-67
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• 1997

정수공정은 "원수 -1 침사지 1 전염소 -1 전오존 -1 침전지 1 여과지 1 후오존 1 GAC 4 후염소 1 가정수"로 이루어져 있으며 전처리 공정으로 염 소와 오존을 주입하게 되는데, 여기서 전염소 처리 공정으로 인해 잔류 유리염 소가 수중의 유기물질과 반웅하여 유해성 유기염소 화합물 (i.e.. Trihalomethane, Haloacetonitriles, Chlorophenol 등)을 생성하는 것으로 알려져 있다. 이러한 이유로 고도 정수처리 공정에서는 강한 산화력을 지닌 대체 산화 제로서 오존을 이용하고 있다. 전오존 처리공정은 OOC와 탁도 제거에 있어 응 집제 주입량을 감소시키는 것과 더불어 전오존 효과 (산화, 생분해 증대, 살균 등)를 얻을 수 있는 것으로 알려져 왔다. 그러나 낙동강과 같이 유기물이 많은 원수에 과다한 오존이 주입되면 수중 의 유기물이 저분자화 또는 응집이 어려운 오존 산화물로 변화하여 응집제의 소비가 많아지게 된다. 실제, 오존을 응집 효과에 대해서 pilot plant로 운전한 결과 전오존에 의해 입자성 물질의 제거 효율은 향상된 반면에 유기물 제거는 뚜렷한 효과를 볼 수 없었다고 보고되었다 (류, 1997). 본 연구에서는 물금 지역의 원수와 응집-침전 공정까지 거치는 각각의 처 리수에 대해서 전처리가 응집에 미치는 영향을 천연유기물질 (NOM)의 조성 변화로 파악하였다. 그 방법으로 천연유기물질 (NOM)을 XAD-1, -4 수지를 이 용하여 소수성 물질 (hydrophobic components)과 친수성 물질 (hydrophilic components)로 분리 및 농축하여 용존 유기물이 처리 과정에서 어떻게 변화하 는지를 조사하여 개선된 상수 처리 시스템을 설계하는데 기초 자료를 제공하고 수질 관리 분야에서도 적용하고자 하였다. 상수원수인 물금 지역의 소수성 물질(hydrophobic components)은 75~80%, 친수성 물질(hydrophilic components)은 30~33%정도의 분포를 보였고, 전염소 및 전오존 공정을 거친 처리수에서는 각각 62.2-62.8%, 43.9~49.0% 및 50~ 55%, 40~57% 정도의 분포를 보였다. 그리고 웅집-침전을 거친 처리수에서는 그 분포가 77~82%, 24-48%였다. 전주리 공정을 통하여 소수성 물질(byoghobic components)의 분포가 감 소하는 것을 볼 때 전염소 및 전오존 처리가 용존유기물의 응집에는 오히려 역 효과를 나타내는 것으로 판단된다. 것으로 판단된다.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.11
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• pp.43-49
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• 2013

We have studied on ozonate water cleaning mechanisms to apply in manufacturing process of 156 mm silicon wafer which is used in the solar cell fabrication. We have analyzed contamination sources on wafer surface which causes poor quality and performance of products in fabrication process, and examined cleaning process using ozonate water to eliminate it. Using this novel technology particles are removed over 94%, and remained organic materials are removed more over 45%.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2001.11a
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• pp.130-131
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• 2001

페놀류화합물의 경우 오존단독반응에서 보다 오존/과산화수소반응이 더 속도가 느림을 알 수 있었는데 이는 Hoigne 등이 이미 제시한 .OH라디칼반응보다 오히려 ortho위치의 오존삽입반응메카니즘으로 진행됨을 알 수 있으며, 반대로 benzophenone의 경우는 .OH라디칼에 의한 산화반응이 더 잘 진행됨을 볼 수 있었다.