• Title/Summary/Keyword: ozone-water

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Ozone Generation Characteristics with Pulse Power Supply (펄스전원을 이용한 오존발생특성)

  • Cho, Kook-Hee;Kim, Young-Bae;Lee, Hong-Sik;Kim, Hag-Gyu;Lee, Jong-Min
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1837-1839
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    • 2003
  • Recently deep interests have been paid on the effective generation of ozone, which has been widely used for water treatment, deoderization, color removal and chemical processing of exhausted smoke. The silent discharge reaction has been proposed as the most effective in the many ozone generation methods by electric discharge, because silent discharge excel others in the condition of high ozone generation yield and low power consumption. In this paper, ozone water generated system measure with silent discharge characteristics and pulsed power supply.

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A Study on the Microbubble Characteristics of Ozone to Improve Dissolution Efficiency (오존 용해효율 향상을 위한 미세기포 특성 연구)

  • Kim, Jin-Hoon;Park, Jong-Ho
    • The KSFM Journal of Fluid Machinery
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    • v.12 no.6
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    • pp.47-53
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    • 2009
  • Ozone is a strong oxidant and a powerful disinfectant. In general, it has been used in drinking water treatment during last 100years. Ozone dissolution features are defined by the two categories of ozone contactors, bubble-diffuser and sidestream ozone contactor. Currently, sidestream-injection systems are gaining in popularity but operating cost might be slightly higher. Sidestream ozone system dissolve ozone into a sidestream flow via an injection setup or in the main process flow stream in some sidestream arrangements. The sidestream flow is subsequently mixed with the main process flow stream, which is directed to a reation tank or pipeline for oxidation and disinfection reactions. The purpose of this study is to suggest optimal operating pressure, to figure out the static-mixer effect and to understand the microbubble characteristics of ozone to improve dissolution efficiency.

A Study of Electrolytic Ozone Generator for Ozone Asher (Ozone Asher용(用) Ozone Generator 개발연구(開發硏究))

  • Moon, Jae-Duk;Woo, Jung-Wook
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.648-651
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    • 1993
  • A parallel plate type electrolytic ozone generator for ozone asher has been fabricated and studied, and 4 kinds of ozone generation anode electrode having different slits have also been investigated. It is found that there were optimum conditions for the slits of electrode, which, however, controls the field in the interelectrode spacing, and allows sideflow waterpaths through the slits in the electrode. As a result, the generated ozone concentrations of A, B, C and D type electrode showed 2.2, 1.3, 1.5 and 3.0 ppm for 400 ml/min flowrate tap water test, and, ozone yields of 11, 13, 15 and 30 $mg/kWhcm^2$ respectively.

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A Study on the Characteristics of Ozonizers and Implementation of a Monitoring System (오존발생기의 특성 연구 및 모니터링 시스템 구축)

  • 김용철;김규식;최주엽
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.5
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    • pp.460-466
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    • 2001
  • The oxidizing power of ozone is the greatest of all commercially available oxidizers and thus ozone is taking the place of chlorine for water treatment. For energy-effective treatment of water, ozone should be generated in high concentration. A silent glow discharge ozonizer is high effective in industrial aspect and thus is the most widely used. We found that the key parameters associated with the ozone generation rate are the driving voltage of the discharger, the discharge rate and the temperature of the ozone generation tube. For an easy control of these parameters, we build a monitoring system with graphical user interface. This system is based on Windows-98 PC, programmed with C++ and LabView.

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Evaluation of Disinfection Characteristics of Ozone, UV Processes for Bacillus Subtilis Spores Inactivation (Bacillus Subtilis Spores 불활성화 실험을 통한 오존, UV 공정의 소독 특성 평가)

  • Jung, Yeon Jung;Oh, Byung Soo;Kang, Joon-Wun
    • Journal of Korean Society on Water Environment
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    • v.22 no.4
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    • pp.672-677
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    • 2006
  • Ozone/UV combined process is an effective technique to enhance generation of OH radical which is non-selective and powerful oxidant. The objective of this study is to evaluate the inactivation rates of B. subtilis spores by three candidate processes (ozone alone, UV alone, ozone/UV combined processes) at 4 and $20^{\circ}$ and to investigate the effects of OH radical on inactivation of B. subtilis spores. On the UV alone process, required UV dosages for lag phase and 3-log inactivation of B. subtilis spores were determined as $8.9mJ/cm^2$ and $47mJ/cm^2$. However, the inactivation of B. subtilis spores didn't occured beyond 4.5-log inactivation despite increasing UV dose. The inactivation of B. subtilis spores by ozone alone and ozone/UV combined process was investigated with ozone CT (Concentration of disinfectant ${\times}$ Contact time) concept. As a result, inactivation of B. subtilis spores by ozone/UV combined process was faster than by ozone alone, and especially $CT_{lag}$ value B. subtilis spores in the presence and absence of t-BuOH, OH radical scavenger, was investigated to evaluate effects of OH radical formed during ozone/UV combined process. We found that OH radical plays important roles on inactivation of B. subtilis spores.

Effect of Ozone Water on Pesticide-Residual Contents of Soybean Sprouts during Cultivation (콩나물 재배중 잔류농약 함량에 미치는 오존수 처리 효과)

  • Kim, Soon-Dong;Kim, Il-Doo;Park, Mee-Za;Lee, Yoon-Gyeong
    • Korean Journal of Food Science and Technology
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    • v.32 no.2
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    • pp.277-283
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    • 2000
  • This study was conducted to investigate the effect of ozone treatment on the growth and pesticide-residual contents of soybean sprouts during cultivation. Total weight and length of the soybean sprouts treated by 0.3 ppm ozone water for 30min during soaking of soybean increased 27% and 19% higher than those of control group, respectively. But 27% of root weight decreased. No major differences in growth state were observed between the treatments during soaking and watering with ozone water, and watering with ozone water. Pesticide residues in soybeans treated with carbendazim, captain, diazinon, fenthim, dichlorvos and chlorpyrifos ranged from 4.75 to 8.35 ppm. The pesticides in soybean sprouts by the treatment of soaking and watering with water for 5 days, those by 0.3 ppm ozone-water watering, and those by soaking and watering with 0.3 ppm ozone water were destroyed to $85{\sim}99$, $89{\sim}100$ and $94{\sim}100%$, respectively. The order of degradation ratio in the pesticides was captan>dichlorvos>fenthion>carbendazin>diazinon>chlorpyrifos.

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Ozone Generation Characteristic Utilizing a Water Surface Discharge (수표면 방전을 이용한 오존발생특성)

  • Kim, In-Woong;Kim, Chan-Gyu;Park, Seung-Lok;Moon, Jae-Duck
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1763-1765
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    • 2002
  • A silent discharge type ozone generator using a water surface as an electrode has been proposed and investigated experimentally. A water surface has many Taylor cones when the ac voltage is applied on its surface, which increase the discharge surface greatly. In this paper, it was studied about the effect of the water conductivity. As increasing the water conductivity, the amount of generated ozone was increased and the silent discharge on the water surface took place steadily and calmly.

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One-side Water-repellent Finish of PET Fabrics using UV/Ozone (UV/Ozone 조사에 의한 PET 직물의 편면 발수가공)

  • Kim, Su-Jin;Jang, Jin-Ho
    • Textile Coloration and Finishing
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    • v.23 no.2
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    • pp.100-106
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    • 2011
  • UV-curable water-repellent finish was carried out to impart one-side repellency to the PET fabrics using a formulation of a UV-active fluorocarbon agent and a water soluble photoinitiator. The aqueous formulation was padded on the PET fabrics and it was subsequently UV-cured. The unirradiated side of the cured fabrics was made to wetteable to water by the prolonged UV/ozone irradiation. The influence of photoinitiator concentration, agent concentration and UV energy for photodegradation on the performance of the finished fabrics were investigated. The difference in the functional property of front and back sides was examined by measuring water repellency at each side of the treated fabrics, which resulted in four rating difference between two-side. The UV-cured and photodegraded PET surfaces were characterized by ATR, ESCA and FE-SEM.

An Experimental Study on the Permeability Evaluation of Metal Spray System by Metal Spray Coating Surface Treatment (콘크리트 표면처리방법에 따른 금속용사 피막의 투수성 평가에 관한 실험적 연구)

  • Park, Jin-Ho;Jang, Hyun-O;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.10a
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    • pp.50-51
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    • 2016
  • Ozone is a strong oxidizing materials in the advanced water treatment facilities. However, due to such a strong oxidation, Ozone eroded waterproofing/corrosion on the concrete surface and caused performance degradation. Therefore, in this study, permeability experiment of metal spraying system by concrete surface treatment was conducted.

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Techniques for Characterizing Surface Deterioration of Epoxy Exposed to Ozone Damage (오존에 노출된 에폭시 코팅재의 표면 열화특성 평가기술)

  • Choi, Sung-Min
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.3
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    • pp.167-177
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    • 2014
  • New technologies for water purification are continuously emerging to address global water quality problems, and one such technology involves advanced hermetic water purification facilities made by concrete that utilize ozone treatment processes. Better knowledge about surface deterioration of epoxy coating exposed to ozone treatment is needed as a foundation for development of improved methods and materials in the future. This study utilized atomic force microscopy (AFM), nanoindentation methods, and existing indirect methods such as visual observation, changes in mass, surface observation and chrominance analysis, to evaluate epoxy water-resistance and anti-corrosiveness. This study considered six different epoxy formulations to assess typical degradation characteristics of epoxy surfaces with regard to water-resistance/anti-corrosiveness. AFM and nanoindentation techniques emerged as promising direct methods with potential to provide quantitative measures of surface quality that are improvements upon existing indirect methods. The experiments also confirmed that some of the epoxy-coatings were severely iMPacted by ozone exposure, and thus the results demonstrate that concern about such deterioration is justified.