대기오염도 실측에 의한 대기오염 자동측정망의 대표성 평가

전의찬 한국환경영향평가학회 1996 환경영향평가 Vol.5 No.1

Simultaneous monitoring in many locations is necessary to evaluate the air quality and analyze future trend of a city. For this purpose, it is essential to install air pollution monitoring network. The first automatic air pollution monitoring network was introduced Seoul in 1973. As of 1995, 20 monitoring stations are now in operation. Concerning the management of the air pollution monitoring network, there was some argument among the relavant scholars, non-governmental organization(NGO) and the government organization. So far, there was no extensive evaluation and analysis about the network. The purpose of this study was to evaluate the representativeness of air quality monitoring network through actual measurement of the concentration of the air pollutant. The concentration of NOx was extensively measured widely in Seoul area three times using the TEA simple measuring technique. Even the judgement level for the area representativeness was lowered to 80%, Ssangmun-dong monitoring station tend to overestimate the pollutant concentration of the covered area. While, Sinlim-dong monitoring station tend to underestimate the pollutant concentration of the covered area.

이산화티타늄계 광촉매를 이용한 톨루엔의 처리 특성

전의찬,송민종,김전희 동신대학교 환경연구소 2000 환경연구 Vol.5 No.1

각종 급ㆍ만성의 건강장해를 일으킬 뿐만 아니라, 광화학 반응에 의해 오존을 형성하는 것으로 알려진 휘발성유기화합물 중 대표적인 물질인 톨루엔을 광촉매산화법으로 처리할 경우 최적 처리조건을 분석하고자 광촉매의 결정구조, 광원의 세기, 전자수용체로서 산소의 유무 등에 따른 톨루엔의 처리효율을 분석하였다. 실험결과 루틸령 결정구조에 비해 아나타제형 결정구조를 갖는 이산화티타늄의 톨루엔 처리효율이 높게 나타났으며, 광원의 세기가 높을수록 전자수용체로서 산소가 존재할 경우 높은 처리효율을 나타내었다. 시간과 공간적인 제약으로 물, 오존 그리고 증기와 같은 다양한 전자수용체가 존재할 경우의 톨루엔의 처리효율을 파악하지 못하였으며, 온도, 습도 및 촉매활성에 영향을 주는 여러 가지 인자들을 대상으로 그것들의 변화에 따른 처리효율의 고찰을 못하였다. 앞으로 보다 효율적인 이산화티타늄계 광촉매의 제조방법 개발과 이산화티타늄계 광촉매를 이용한 다양한 VOC 처리방법의 개발이 요구된다. An available methods for abating VOC(including Toluene) are thermal or catalytic incineration, liquid absorption, solid adsorption, condensing, membranes, biodegradation and plasma discharge, but a number of defects are these VOC abating methods, including ; requires a auxiliary fuel, generate secondary pollutants(waste catalysts, waste absorbents, waste adsorbents, ozone, etc.), a large scale, etc.. But photoactive catalysts, when illuminated with UV-light, generate highly reactive radicals that can oxidize the organic contaminants in gas. One methods to increase the efficiency of the process, and thereby reduce the light energy requirement, is by developing more active catalysts. Because of, ball type TiO2 catalyst were obtained commercially and/or prepared in laboratory were examined for their photoacivity, and they are TiO2 added some annex(Al203, SiO2, KsO, P205, etc.). The organic compounds used to identify the best photocatalysis condition were toluene. This study also examined the impact of catalyst structure, light intensity, existence of oxygen as an electron acceptor and Toluene initial concentration on the reaction kinetics. Labratory experiments were performed to investigate TiO2 photocataysis for treating test gas contaminated with Toluene. and TiO2 photocatalysis efficiency for mineralization of Toluene is also evaluated. The photooxidation of Toluene was carried out in a photocatalytic reactor at room temperature. I performed Toluene photocatalytic oxidation experiments using a single-pass annular reactor. The organic-contaminated gas was prepared in teflon sampling bag(25L) and passing through photocatalytic reactor by vacuum pump which is located reactor outlet. The Toluene diluted with mixture air or nitrogen gas. Flow rates for test gas stream were controlled by micro flow meter going out the reactor. The reactor illuminated with 15W near-UV lamp, BLB lamp or Fluorescent lamp. The light intensity at the catalyst surface were estimated to be 0.8 to 6㎽ ㎝-2s-1. The inner cell of the reactor was packed with ball type titanium dioxide(φ 6㎜). Toluene was determined by GC-FID of gas samples taken from the a glass sampling bulb which was located at reactor outlet by gas-tight syringe. TiO2 photocataysis for treating test gas contaminated with Toluene. and TiO2 photocatalysis efficiency for mineralization of Toluene is also evaluated. Using the anatase type photocatalyst, Touene conversion rate is greater than that of rutile(86.1% conversion of 100ppmv Toluene using anatase type photocatalyst, 78% conversion of 100ppmv Touene using rutile type photocatalyst at 0.5L/min) Effect of light intensity on the rate of Toluene photocatalytic decomposition was investigated by three type lamps within the reactor. When light intensity to increase, the Toluene conversion rate to increase. Using the BLB lamp showed higher activity than the Fluorescent lamp, but UV lamp showed the hight photocatalytic activity(19.1% conversion of 100ppmv Toluene with Fluorescent lamp, 60.4% conversion of 100ppmv Toluene with BLB lamp, 86.1% conversion of 100ppmv Toluene with UV lamp at 0.5L/min). Experiments with added oxygen as an electron acceptor improved the reaction rate considerably(86.1% conversion of 100ppmv Toluene without oxygen, 62.5% conversion of same Toluene concentration with mixture air at 0.5L/min).

이산화질소의 연직분포 특성에 관한 연구

전의찬,이성기 조선대학교 환경연구소 1991 環境公害硏究 Vol.8 No.-

Recently, a number of high-rise buildings have been constructed in big cities such as Seoul. The air pollution levels at these buildings are expected to be generally different from those at the ground level. The purpose of this study is to show the vertical distribution of nitrogen dioxide(NO_(2)) in Seoul City. The concentration of NO_(2) with height were measured at the Korea Exhibition(KOEX) building(54 stories), one of the new high storied buildings. At the same time, the vertical variation of the temperature were measured and the effect of the atmospheric stability on the vertical distribution of air pollutants was analyzed. The result are as follows; 1) In the morning. the minimum concentration was found at 50m above the ground, and the maximum value at the ground level and 110m above the ground. In the afternoon, the minimum value was found at 110m above the ground, and the maximum value at 50m above the ground. At night, the minimum value was found at 50m above the ground, and the maximum value at 160m above the ground. 2) The minimum value of daily average concentration was found at 50m above the ground, and the maximum value at the ground level and 160m above the ground. 3) The daily variation of air pollution concentration turned out to have a close relationship with the atmospheric stability. The NO_(2) concentration was higher in the morning exceeding the long-term air quality standard.

기후변화협약 제28차 기후변화총회(COP28) 주요 결과와 우리의 대응

전의찬 한국주민자치학회 2024 월간 공공정책 Vol.220 No.-

서울시의 바람장 특성 및 상사성 분석

全儀燦 동신대학교 환경연구소 1995 환경연구 Vol.1 No.1

바람장 특성은 어느 지역의 대기질을 결정하는 중요한 요소의 하나이다. 서울시의 바람장 특성을 파악하기 위하여, 1988~l992년 5년간 서울시의 풍향을 분석한 결과, 북동풍 및 동북동풍이 25%~32%, 서풍 및 서남서풍이 22%~33%의 빈도를 보였다. 또 풍속은 풍향계 감지한계 이하인 '1'등급 이하의 품속이 40%안팎을 차지하고 있어서 서울은 대기오염물질의 확산에 매우 불리한 지역임을 알 수 있었다. 서울시의 위치한 20개소의 대기오염 자동측정망 관측자료를 이용하여, 서울시 바람장의 상사성을 집락분석으로 분석한 결과, 측정소를 4개의 집락으로 구분할 수 있었다. 그리고, 각 집락의 대표 측정소로 선정된 신설동, 방이동(또는 성수동), 반포동, 마포동, 구로동 측정소를 미기상 측정소로 활용하는 것이 서울과 같이 넓은 지역의 바람장 특성을 확보하는 데 바람직할 것으로 판단되었다. Wind field is one of the important factors which have significant impacts on the air quality in an area. The frequency of wind direction in Seoul showed that the Northwesterly wind and Eastnortheasterly one were 25%∼32%, and the Westerly wind and Westsouth-westly one were 25%∼32%, which was considered as major wind direction. Wind speed less than 1.5m/sec, which is slow, comprised 40% of all, which is unfavorable to the air pollutant dispersion. Also, I analyzed the similarity of the wind field in Seoul by Cluster analysis in order to select the air pollution monitoring stations for micrometeorology. Consequently, It would be desible to utilize Bangi-dong (or Seongsu-dong), Banpo-dong, Mapo-dong, Kuro-dong monitoring stations for micrometeorology measurement.

오존 오염도에 대한 기상요소의 영향 분석 및 예측모형 수립

전의찬,우정헌,장영기 대한환경공학회 1996 대한환경공학회 학술발표논문집 Vol.1996 No.12

TiO₂광촉매 운전조건에 따른 MEK의 처리특성

전의찬,사재환 동신대학교 환경연구소 2001 환경연구 Vol.6 No.1

최근에는 TiO₂광촉매를 이용하여 휘발성유기화합물(VOCs)을 처리하는 광분해 연구가 활발히 개발 되어지고 있다. TTiO₂ 광촉매반응은 TiO₂입자의 에너지 밴드보다 더 높은 에너지가 흡수하면 전자와 홀이 생성되며, 이때 발생된 전자는 분자상태의 산소와 결합하여 환원반응이 일어나며, 홀은 공기중의 물분자나 OH기를 흡수하는 산화반응이 일어난다. 본 연구에서는 휘발성유기화합물 중 MEK를 대상으로, 회분식 반응기와 연속식 반응기를 사용하였으며, 여러 가지 운전조건에 따른 제거효율을 살펴보았다. 코팅방법은 pyrex 판과 유리관에 TiO₂ 용액을 채우고, 일정한 속도로 TiO₂용액을 제거하는 Dip-coating방법을 이용하였다. 실험 결과, 코팅횟수를 3회 실시 했을 때 제거효율이 향상되었으며, 자외선8W에 비해 65W를 사용했을 때 약 40%이상 제거효율 향상을 보였다. 또한, 반응기의 지름이 작을수록 높은 제거효율을 보였다. Recent photo catalytic degradation method using TiO₂ photo catalytic is developed for volatile organic compounds(VOCs) treatment. TiO₂ photo catalytic process is initiated from the generation of hole-electron pairs on the semiconductor upon absorbing the ultra-violet light with energy being equal or higher than the band gap energy. Electrons can reduce an electron acceptor such as molecular oxygen and holes can oxidize electron donors including adsorbed hydroxide(OH) or water(H₂O) anion. In the suduy, the target gas compound was methyl ethly ketone(MEK), and examined in a batch scale reactor and a continuous scale reactor at various experimental conditions. A TiO₂ thin film photo catalyst was formed by the dip-coating method after filling a pyrex plate and pyrex tube with the TiO₂solution, it was removed from the reactor at a constant rate. Then it was dried at 120°C for one hour. Result of study, photo catalytic degradation of MEK was improved removal efficiency when TiO₂ photo catalytic coated 3nd times. When increase of UV light intensity(65W), photo catalytic degradation of MEK was improved higher than lower UV light intensity(8W) and it was improved at a small diameter reactor.

종교단체의 환경교육 현황과 발전방향 -한국천주교를 중심으로-

전의찬 한국환경교육학회 1994 環境 敎育 Vol.6 No.1

환경관리인양성 및 훈련개선방안(하)

전의찬 한국환경기술인연합회 2001 환경기술인 Vol.173 No.-

연료와 CO₂ 농도분석을 이용한 아역청탄 화력발전소의 온실가스 배출계수 개발

전의찬,사재환,Jeon, Eui-Chan,Sa, Jae-Hwan 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.2

The main purpose of this study was to develop the greenhouse gas emission factor for power plant using sub-bituminous coal. In Korea, Fired power plant are a major source of greenhouse gases within the fossil fuel combustion sectors, thus the development of emission factors is necessary to understand the characteristics of the national specific greenhouse gas emission and to develop nation specific emission factors. These emission factors were derived from the $CO_2$ concentrations measurement from stack and fuel analysis of sub-bituminous coal. Caloric value of sub-bituminous coal used in the power plants were 5,264 (as received basis), 5,936 (air-dried basis) and 6,575 kcal/kg (dry basis). The C emission factors by fuel analysis and $CO_2$ concentration measurement was estimated to be 26.7(${\pm}0.9$), 26.3(${\pm}2.8$)tC/MJ, respectively. Our estimates of C emission factors were comparable with IPCC default value.