• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1995년도 하계학술대회 논문집 C
• /
• pp.1375-1377
• /
• 1995

This paper describes characteristic of ozone Generation by positive streamer corona discharge. Experiments were carried out with needle-plane Electrodes in a pyrex glass tube, in order to in crease the ozone yield. The results of Experiments confirmed needle an gle $45^{\circ}$ Gap spacing 15mm is adaptive Electrode arrangement.

• 한국조명전기설비학회지:조명전기설비
• /
• 제10권6호
• /
• pp.62-72
• /
• 1996

본 연구에서는 광화학반응법을 이용하여 오존 발생기로서의 역할과 광원으로서의 기능을 동시에 수행할 수 있는 U자형 Lamp(Olamp)를 사용한 오존 발생기를 설계 및 제작하여 Olamp의 방전 특성, 스팩트럼 특성, 조도특성, 오존생성특성 및 살균특성을 연구검토한 결과 다음과 같은 결론을 얻을 수 있었다.(1)Olamp의 스펙트럼특성을 조사한 결과 오존을 생성하는 단파장 자외선과 조명으로 활용가능한 가시광선이 방사됨을 확인할 수 있었다.(2)Olamp의 조도는 한국산업표준규격 조도 기준에 의하여 "어두운 분위기중의 시식별작업 및 간헐적인 시작업"에 사용가능한 조도 특성을 얻을 수 있었다. (3)원료가스의 유량이 작을수록 오존생성농도는 상승하고 오존 발생량은 감소하였으며, 유량이 동일할 때 모의 공기를 사용한 경우보다 산소를 사용한 경우가 오존생성농도 및 오존발생량이 상승하였다.(4)오존발생량 및 오존생성수율은 초기 오존생성농도가 높을수록 상승하였다.(5)액상에서의 용존오존농도 특성은 반응장치의 교반속도 및 오존생성속도가 높을수록 상승하였다.(6)대장균(Escherichia coli)에 대한 살균특성을 조사한 결과, 97[%]이상의 살균 특성을 얻을 수 있었다. 얻을 수 있었다.

• 한국대기환경학회지
• /
• 제19권5호
• /
• pp.583-594
• /
• 2003

Ozone is an important atmospheric pollutant that is occurred in tropospheric chemical process and it also affects the human health and plants. For a correct application of abatement strategies for ozone, it is necessary to understand the factors that control atmospheric ozone removal by dry deposition processes. The present study investigates the numerical simulation of the dry deposition velocity (V$^{d}$ ) obtained from PNU/DEM (Pusan National University Deposition Model). PNU/DEM includes seasonal categories, meteorological factors, surface properties and land-use types and proposes for an accurate numerical computation. And, this study examines the ability of the PNU/DEM to compute V$_{d}$ of ozone over water surfaces and evaluates PNU/DEM by comparing its estimated V$_{d}$ to past observed V$_{d}$ over water. The parametrization was found to yield V$_{d}$ values generally in good agreement with the observations for the deciduous forest and the coniferous forest. Ozone is removed slowly at wet surface or water due to its low water solubility. Therefore V$_{d}$ values over water were lower than Vd values over the other surfaces. Comparison of PNU/DEM simulated V d values to observations of ozone V$_{d}$ that have been reported in the literature implies that PNU/DEM produces realistic results.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 하계학술대회 논문집 C
• /
• pp.1837-1839
• /
• 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.

• 펄프종이기술
• /
• 제43권1호
• /
• pp.29-35
• /
• 2011

Since the role of lignin in the wood cell wall is to keep integrity and structure rigidity of lignocellulosic substrate, lignin of the cell wall has to be destroyed before enzymatic hydrolysis of wood polysaccharides. The aspen wood meals were delignified with ozone in acidic condition. The chemical characteristics of wood meal were investigated. The 60% of lignin and almost zero % of polysaccharides in aspen wood meal was degraded with 10min. ozone treatment. The phenolic hydroxyl groups of lignin in ozonated wood meal were increased with ozonation time. The sugar composition of ozonated wood meal showed that the hemicellulose was more susceptible to ozonation than cellulose. The yield of aldehyde was increased in some degree with 10min. ozone treatment and decreased with longer ozone treatment.

• 한국대기환경학회지
• /
• 제15권5호
• /
• pp.545-554
• /
• 1999

We would like to develop a short-term model to predict the time-related concentration of ozone whose reaction mechanism is complex. The paper targets Seoul where an ozone alert system has recently been employed. In order to develop a short-term prediction model for ozone, we suggested the Ozone Peak Indicator(OPI), an equivalent of the potential daily maximum ozone concentration, with precursors being the only limiting factor, and we calculated the Ozone Peak Indicarot as OPI={$rac{(O_3)_{max}cdot(H_{eH})_{max}(Rad)_{max}$ to preclude the influence of mixing height and solar radiation on the daily maximum ozone concentration. The OPI on the day of the prediction is to be calcultated by using the relation between OPI and the initial value of precursors. The basic prediction formula for time-related ozone concentration was established as $O_3(1)={(OPI)cdot Rad(t-2)H_{eH}}$, using the OPI, solar radiation two hours before prediction and mixing height. We developed, along with the basic formula for predicting photochemical oxidants, "SEOM"(Seoul Empirical Oxidants Model), a Fortran program that helps predict solar radiation and mixing height needed in the prediction of ozone pollution. When this model was applied to Seoul and an analysis of the correlation between the observed and the predicted ozone concentrations was made through SEOM, there appeared a very high correlation, with a coefficient of 0.815. SEOM can be described as a short-term prediction model for ozone concentration in large cities that takes into account the initial values of precursors, and changes in solar radiation and mixing height. SEOM can reflect the local characteristics of a particular and region can yield relatively good prediction results by a simple data input process.t process.

• 조명전기설비학회논문지
• /
• 제23권5호
• /
• pp.80-87
• /
• 2009

최근 오존은 그 효용성을 인정받아 다양한 분야에서 사용되고 있으며, 그 수요 또한 계속 증가하는 추세이다. 이에 다양한 종류의 오존발생기가 연구되고 있다. 본 연구는 실내공기와 상 하수도의 수질개선을 위하여 cascade형 평판전각 오존발생기(plate-type ozonizer : PTO)를 개발하여 그 특성을 조사한 논문이다. 평판전극의 크기, 개수 및 배치에 따라 4가지 형태의 오존발생기를 설계하였다. 각 형태의 오존발생기의 방전 면적은 22,400[$mm^2$]로 동일하며 방전전력은 최대 40[W]이다. 각 오존발생기의 오존생성량, 오존생성농도, 오존생성수율 특성을 연구한 결과, 8개의 평판전극이 cascade형으로 배치된 오존발생기(PTO-4)의 오존생성특성이 가장 우수하게 나타났다.

• 한국물환경학회지
• /
• 제24권1호
• /
• pp.63-68
• /
• 2008

This study was performed to assess the potential use of ozone or UV radiation for the treatment of water contaminated with sulfamethoxazole (SMX), which is frequently used antibiotic in human and veterinary medicines, especially focusing on the kinetic study and effect of pH. In a study using ozone alone, kinetic study was performed to determine second-order rate constant ($k_{O3,SMX}$) for the reactions of SMX with ozone, which was found to be $1.9{\times}10^6M^{-1}s^{-1}$ at pH 7. The removal efficiencies of SMX by ozone were decreased with increase of pH due to rapid decomposition of ozone under the condition of various pH (2.5, 5.3, 7, 8, 10). In a UV irradiation study at 254 nm, a kinetic model for direct photolysis of SMX was developed with determination of quantum yield ($0.08mol\;Einstein^{-1}$) and molar extinction coefficient ($15,872M^{-1}cm^{-1}$) values under the condition of quantum shielding due to the presence of reaction by-products formed during photolysis. For effect of pH on photolysis of SMX, SMX in the anionic state ($S^-$, pH > 5.6), most prevalent form at environmentally relevant pH values, degraded more slowly than in the neutral state (SH, 1.85 < pH < 5.6) by UV radiation at 254 nm.

• Asian Journal of Atmospheric Environment
• /
• 제9권2호
• /
• pp.173-186
• /
• 2015

In Bangladesh, increases in the tropospheric ozone ($O_3$) concentration and in soil salinization may lead to crop damage. To clarify the effects of $O_3$ and/or soil salinity on Bangladeshi wheat cultivars, BAW1059 (salt-tolerant) and Shatabdi (salt-sensitive) were exposed to 70-day treatments with $O_3$ (charcoal-filtered air (CF), $1.0{\times}O_3$, and $1.5{\times}O_3$) and different levels of soil salinity (0, 4, and $8dS\;m^{-1}$). In both cultivars, the whole-plant dry mass and grain yield were significantly reduced by exposure to $O_3$. Increased soil salinity caused significant reductions in whole-plant growth and yield in Shatabdi, but the reductions were negligible in BAW1059. No significant interactions between $O_3$ and salinity were detected for growth, yield, and leaf gas exchange parameters in both cultivars. We concluded that the effects of $O_3$ are not ameliorated by soil salinity in two Bangladeshi wheat cultivars, regardless of their salinity tolerance.

• 조명전기설비학회논문지
• /
• 제15권6호
• /
• pp.103-110
• /
• 2001

최근 오존은 그 효용성을 인정받아 다양한 분야에서 사용되고 있으며, 그 수요 또한 계속 증가하는 추세이다. 이에 다양한 종류의 오존발생기가 연구되어지고 있다. 이러한 오존발생기는 모두 고농도와 고수율을 얻는데 그 연구목표가 있다고 할 수 있으며, 그중 하나가 동축원통형 오존발생기이다. 본 논문에서는 고주파 전원을 사용하는 새로운 형태의 원통형 오존발생기를 제안하였으며, 오존발생기의 전극 간극의 변화에 따른 방전특성과 오존생성특성을 연구하였다.