광투과방식을 이용한 환경대기중의 휘발성유기화합물 농도 측정

전의찬,서성은 동신대학교 환경연구소 1998 환경연구 Vol.3 No.1

최근 들어 환경 대기 중 VOCs에 대한 인식의 고조로 성분분석 기술과 성분비 등에 대한 연구가 활발히 진행되고 있다. 그러나, 환경 대기 중의 VOCs에 대한 전반적인 거동을 파악할 수 있는 자료들이 매우 적은 실정이다. 본 연구에서는 DOAS 측정방식을 이용하여 대표적인 VOCs 물질인 Benzene, Toluene, p-Xylene의 계절별, 일중 변화 특성을 파악하고자 하였다. 대상물질들은 모두 계절별로 뚜렷한 변동 독성을 나타나지 않았으며, 일중변화에 있어서는 p-Xylene이 일사량이 많은 11시-13시에 비교적 높은 농도를 나타내었다. VOCs 물질 사이의 상관성은 Benzene과 Toluene이 비교적 높은 양의 상관관계, Benzene과 p-Xylene, Toluene과 p-Xylene은 높은 음의 상관관계를 보였다. 기상요소와의 상관성은 대기압과 Toluene, 습도와 p-Xylene이 비교적 높은 양의 상관관계를, 온도와 Toluene, 습도와 Benzene 및 Toluene이 각각 비교적 높은 음의 상관관계를 보였다. We observed temporal characteristics of VOCs concentrations in ambient air using a Differential Optical Absorption Spectroscopy(DOAS). We could not find the difference in the seasonal variations of the observed data for all the object materials(Benzene, Toluene, p-Xylene) whereas p-Xylene showed relatively high concentration at 11 a.m. to 1 p.m.. Correlation analysis of VOCs showed that Benzene had a relatively high positive correlation with Toluene, and Benzene and Toluene had a high negative correlation with p-Xylene. Among meteorological elements, atmospheric pressure with Toluene and relative humidity with p-Xylene showed high positive correlations while temperature with Toluene, and relative humidity with Benzene and Toluene showed high negative correlations.

'지방의제 21 실천계획' 수립을 위한 시민 환경의식 조사 연구

전의찬,사재환,조순철 동신대학교 환경연구소 2000 환경연구 Vol.5 No.1

환경기초시설 중 하·폐수처리과정으로부터의 GHG 배출량 예측 : 광주·전남지역을 중심으로 Kwang ju·Chollanado

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

본 연구는 환경기초시설 중에서 생활하수와 산업폐수 처리장에서 발생하는 특히 광주·전남 지역을 중심으로 온실가스의 배출량과 장래 저감 잠재성을 평가하고, 기후변화협약을 대비한 국가 Inventory의 기초자료로 이용될 수 있도록 하였으며, 결론적으로 하ㆍ폐수부문에서 온실가스 배출 잠재성을 감소시키기 위한 방안으로 먼저 하수 및 폐수의 체계적인 수집이 이루어져야 하며, 수집된 하ㆍ폐수는 반드시 적절한 처리과정을 통하여 수계에 배출되어져야 한다. 또한 적절한 처리과정 중에 배출되는 온실기체의 대기 중으로의 누설을 억제하고 회수율을 높이는 관리대책이 수립되어야 하며, 회수율을 높이는 대책은 하ㆍ폐수부문에서 온실가스 배출 잠재력에 대한 저감율에 대하여 좀더 효율적임을 알 수 있다. 또한 상기와 같은 저감방법 외에도 하ㆍ폐수부문에서의 온실가스 저감잠재력을 위하여 정부는 온실가스 배출량을 계산하는데 필요한 여러 가지 자료를 확보하고, 좀더 신뢰할 수 있는 온실가스 배출량을 산출하며, 이들 자료를 토대로 정부는 하ㆍ폐수부문에서의 온실가스 저감잠재력을 위하여 연차적으로 관리대책을 설정해야 한다. 그리고 이에 대한 검중체계를 마련하여 전ㆍ후 효과분석을 해야 할 것이다. This study evaluated greenhouse gas(GHG) emissions and future reduction potential emitted from domestic and industrial wastewater treatment system in Kwangju city and Chollanamdo. For decreasing of GHG emissions potential, systematic collection method of domestic and industrial wastewate is established and collected domestic and industrial wastewater is treated reasonal wastewater treatment process. GHG which is leak from wastewater treatment process to air was controled, Control policy which are increasing recovery ratio was established. In addition to decreasing method, Government make sure of variable data fro estimating GHG emissions quality and evaluated GHG emissions quality reliable method.

이산화티타늄계 광촉매를 이용한 벤젠의 처리 특성

전의찬,송민종,김전희 동신대학교 환경연구소 1999 환경연구 Vol.4 No.1

An available methods for abating VOC(including Benzene) 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(Al₂O₃, SiO₂, KsO, P₂O_(5), etc.). The organic compounds used to identify the best photo catalysis condition were benzene. This study also examined the impact of catalyst structure, light intensity, existence of oxygen as an electron acceptor and Benzene initial concentration on the reaction kinetics. Labratory experiments were performed to investigate TiO₂ photo catalysis for treating test gas contaminated with Benzene. and TiO₂ photo catalysis efficiency for mineralization of Benzene is also evaluated. The photo oxidation of Benzene was carried out in a photo catalytic reactor at room temperature. I performed BTX photo catalytic oxidation experiments using a single-pass annular reactor. The organic-contaminated gas was prepared in Teflon sampling bag(25L) and passing through photo catalytic reactor by vacuum pump which is located reactor outlet. The BTX 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 6mW cm-2s-1. The inner cell of the reactor was packed with ball type titanium dioxide(Ø 6mm). Benzene 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 photo catalysis for treating test gas contaminated with Benzene. and TiO₂ photo catalysis efficiency for mineralization of Benzene is also evaluated. Using the anatase type photo catalyst, Benzene conversion rate is greater than that of rutile(92% conversion of 100ppmv Benzene using anatase type photo catalyst, 80% conversion of 100ppmv Benzene using rutile type photo catalyst at 0.5L/min) Effect of light intensity on the rate of Benzene photo catalytic decomposition was investigated by three type lamps within the reactor. When light intensity to increase, the Benzene conversion rate to increase. Using the BLB lamp showed higher activity than the Fluorescent lamp, but UV lamp showed the hight photo catalytic activity(26% conversion of 100ppmv Benzene with Fluorescent lamp, 63.5% conversion of 100ppmv Benzene with BLB lamp, 92% conversion of 100ppmv Benzene with UV lamp at 0.5L/min). Experiments with added oxygen as an electron acceptor improved the reaction rate considerably(92% conversion of 100ppmv Benzene without oxygen, 66.1% conversion of same Benzene concentration with mixture air at 0.5L/min). The Benzene conversion rate begins to decrease while Benzene initial concentration begins to increase. We have thus concentrated our effects on the study of Benzene degradation kinetics in vary initial Benzene concentration.

생물학적 흡수법을 이용한 악취물질의 처리

전의찬,송민종 동신대학교 환경연구소 1997 환경연구 Vol.2 No.1

그 동안 악취를 유발하는 대표적인 물질의 하나인 황화수소의 처리에 대한 많은 연구가 수행되었다. 그러나 이들 연구의 대부분은 물리ㆍ화학적인 방법에 의존하고 있어 설치 및 운영에 경제적인 문제가 수반되었으며, 이에 따라 최근에는 활성슬러지법과 토양흡착 등 미생물을 이용한 생물학적 처리방법들이 연구되어지고 있다. 본 연구에서는 미생물의 부착이 용이한 섬모상충진층을 설치한 바이오스크러버를 이용하여 황화수소를 제거하고자 하였다. 실험결과 바이오스크러버에 의한 황화수소의 제거효율은 일반적인 스크러버을 이용한 제거효율보다 약 40% 높게 나타났으며, 황화수소의 유입농도 및 유입유량이 낮을수록 높게 나타났다. An odor that causes people displeasure and disgust and sometimes that has lead people to start demonstration. Among these odors, H2S is the worst smelling, therefore many people have started dup studies a researches to find a way to remove this odor. To remove this odor, researchers have began to develop a process which is called a bio-scrubber. These bio-scrubbers have been built and are in the process of being tested and compared with a general scrubber, to see if it is as economical and effective as the general scrubber. The test results shows that the bio-scrubber has a fixed flow of 5milliliter per min. The bio-scrubber was compared with the general scrubber in all three stage. The results show that the bio-scrubber removes more H2S in stage one, two and three than the general scrubber removal in the same three stages. Thus proving to be far more effective than its predecessor.

광주광역시의 점오염원 배출자료체계 구축에 관한 연구

전의찬,송민종 東新大學校 1997 論文集 Vol.9 No.-

For the development of point source emission inventory system in Kwangju, we reserched into point source location, physical characteristics and fuel consumption for air pollutant discharge facilities classification(class 1 to class 3). And we estimated quantity of air pollutants by source scale, drawing up distribution chart of air pollutants. It was found that there were 51 point sources located in Kwangju and Metal products are the most numerous industry. Also, Emmision quantity of air pollutants were estimated at SO_2 4,224ton/yr, NO_2 1,004ton/yr and TSP 76ton/yr and 'Rubber and plastic products' emited the most air pollutants in Kwangju.

원자력 지역난방의 대기질 개선 효과에 관한 연구

전의찬 東新大學 1990 論文集 Vol.3 No.-

The purpose of this Study is to show the effect of the district heating by a small nuclear plant on SO_2 concentration reduction. The district heating by the small nuclear plant reduces annual average SO_2 concentration by 13.5%, and winter season average SO_2 concentration by 14.4% at the highest point. The maximum reduction of SO_2 concentration can be found in Gaepo area, where the reduction is estimated 23.8% in annual average, and 19,6% in winter season average concentrations. The average reduction of SO_2 concentration in the district treating area is found to be 11.3%, in annual average concentration, and 10.5% in winter season average concentration.

HY-SPLIT 모형을 이용한 오염물질의 장거리 이동 추적

전의찬,우정헌 東新大學校 1996 論文集 Vol.8 No.-

Due to the rapid economic development for the last 20 years, Asian countries' fuel consumption has doubled twice every twelve years. Also, serious environmental problems, especially air pollution, have followed rapid urbanization and development in Northeast Asia, where Korea is located. The pattern of long range transport of air pollutants was investigated in the Northeast Asia region. The focus of this study was the impact of air pollutants from China on the air quality of Korea. From the meteorological data from the 1st to the 5th of January 1995, the backward and forward trajectories were calculated using the Hybrid model 'HY-SPLIT', and the contributions of air pollutants from cities of China to the air quality in Korea were analyzed. It was concluded that the air pollutants from China could have a great influence on the air quality in Korea. The trajectories showed that the air pollutants from Beijing and Jinan, Shandong Province, the most heavily industrialized areas in China, could be influenced strongly to the air quality in Korea.

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.

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.