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순환형 UV-TiO₂ 광촉매 공정을 이용한 냄새 및 VOCs 제거장치의 성능 비교 평가
최금찬(Kum-Chan Choi),김종범(Jong-Beom Kim) 한국실내환경학회 2011 한국실내환경학회지 Vol.8 No.3
This paper presented experimental results for circulation type UV-TiO₂ photocatalytic oxidation process. We have developed UV-TiO₂ photocatalytic oxidation process with activated carbon to control odor and VOCs in indoor and industrial applications. In this study, common indoor air pollutants, namely ammonia, formaldehyde, hydrogen disulfide, toluene were selected to investigate their efficiencies for UV-TiO₂ photocatalytic oxidation. In high concentration test, the decomposition efficiency was high in order as ammonia, toluene, formaldehyde, hydrogen disulfide. Three type of individual processes are tested for ability to increase decomposition efficiency. UV-TiO₂ photocatalytic oxidation combined process with activated carbon was excellent among the three type processes without reference to gas species. It was considered that this circulation type process will overcome short retention time for treatment for UV-TiO₂ photocatalytic oxidation. It will promise that this circulation type UV-TiO₂ photocatalytic oxidation combined process can apply indoor and industrial applications to remove odor and VOCs quickly.
최금찬(Kum Chan Choi),류재용(Jae Yong Ryu),서정민(Jeong Min Suh) 한국실내환경학회 2009 한국실내환경학회지 Vol.6 No.4
This paper presented experimental results for photocatalytic air cleaner removal performance for malodorous compounds generated from rest room. Photocatalytic oxidation (PCO) efficiency was up to 80∼90% for NH3 in chamber, 29.3% for H2S, 79.6% for CH3SH, 58.8% for DMDS individually. PCO efficiency for DMS(Dimethy Sulfide) and DMDS(Dimethyl Disulfide) were relatively lower than that of NH3 and CH3SH, this results indicate that DMS and DMDS removal process were effected by by-products of photocatalytic oxidation and humidity. Ozone was relatively low (below 5ppb) under the test conditions through photocatalytic oxidation. It is necessary to test a reliability of the air cleaner for a longtime under the various indoor conditions. But, prototype photocatalytic air cleaner will promise useful air cleaner for indoor air quality applications.
Passive Sampler 를 이용한 대도시의 대기질 평가
전의찬(Eui Chan Jeon),김신도(Shin Do Kim),최금찬(Kum Chan Choi) 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.2
Filter badge type sampler has not been widely used to evaluate air quality over large cities in Korea while it can be successfully used for multi-point sampling and analysis. We evaluated the passive sampler as a new tool to monitor air quality over large cities. We latticed Metropolitan Seoul into 2 × 2Km to give 136 points. NO₂ concentrations were measured at all the points in the Spring and Summer of 1997. According to the passive sampler data, natural green zones generally recorded lower NO₂ concentrations than major streets and traffic congestion areas. Passive samplers with abundant 136 points gave more detailed picture of NO₂ distribution while auto-monitoring network did not clearly provide the characteristics of local land use. Also, passive samplers gave 15% higher values than auto-monitoring network. The correlation between the two values appears very high judging from the regression slope of 0.92 and correlation coefficient of 0.91. This study clearly demonstrates the effectiveness of the passive sampler as a tool to monitor air quality over large cities.
천연제올라이트 개질을 통한 건식 CO<sub>2</sub> 흡착제의 특성
최창용 ( Chang-yong Choi ),강헌찬 ( Heun-chan Kang ),성낙창 ( Nak-chang Sung ),최금찬 ( Kum-chan Choi ) 한국환경기술학회 2014 한국환경기술학회지 Vol.15 No.5
온실가스의 제어에 대한 국제적 조약과 관련 제어기술의 연구가 활발히 진행되고 있다. 이 중CO<sub>2</sub> 제어를 위한 습식흡착제를 이용한 기술이 많이 사용되고 있으며 재생 시 높은 에너지와 폐수처리의 문제를 가지고 있다. 건식 형태의 CO<sub>2</sub> 흡착제는 산업분야의 CO<sub>2</sub> 배출에서 미래에 흡착성능을 향상시킬 수 있는 방안이다. 본 연구에서는 천연 제올라이트를 이용하여 이온교환을 통한 새로운 건식흡착제를 개발하는 것으로 목적으로 하고 이온교환 및 열처리를 거쳐 CO<sub>2</sub> 흡착에 대해 각각의 성능을 비교 분석하였다. K<sup>+</sup> 로 이온교환된 0.5M 농도의 흡착제가 가장 CO<sub>2</sub> 의 흡착력이 좋은 것으로 나타났다. 건식흡착제의 흡착성능은 공극의 크기, 공극의 부피, 형상 그리고 BET 와 더불어 미세공극의 구조에 영향을 받는 것으로 나타났다. There have been a lots of international agreements for reduction of greenhouse gases and studies to control industrial activities and life styles. One of the CO<sub>2</sub> control technologies is to use wet absorbents but it has some disadvantages such as absorbing power, wastewater treatment and high energy consumption problems for recycle. Dry type CO<sub>2</sub> adsorbents will promise CO<sub>2</sub> control technology to promote its adsorption efficiency by amending natural zeolite. We have developed environmental-friendly and economical CO<sub>2</sub> drying absorbents using natural zeolite by ion exchange and heat treatment. The absorbent with K<sup>+</sup> ion exchange at 0.5M has showed most effective absorbing performance which depends on pore size, pore volume, and features and structure of micropore area along with BET.
SEM-EDX 분석법에 의한 부산 S공업단지의 PM<sub>10</sub>과 PM<sub>2.5</sub>의 화학적 조성 및 발생원 추정
김용석 ( Yong-seog Kim ),최금찬 ( Kum-chan Choi ),서정민 ( Jeong-min Suh ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.11
This study identified physical characteristics and aerosol particle sources of PM<sub>10</sub> and PM<sub>2.5</sub> in the industrial complex of Busan Metropolitan City, Korea. Samples of PM<sub>10</sub>, PM<sub>2.5</sub> and also soil, were collected in several areas during the year of 2012 to investigate elemental composition. A URG cyclone sampler was used for collection. The samples were collected according to each experimental condition, and the analysis method of SEM-EDX was used to determine the concentration of each metallic element. The comparative analysis indicated that their mass concentration ranged from 1% to 3%. The elements in the industrial region that were above 10% were Si, Al, Fe, and Ca. Those below 5% were Na, Mg, and S. The remaining elements (1% of total mass) consisted of elements such as Ni, Co, Br and Pb. Finally, a statistical tool was applied to the elemental results to identify each source for the industrial region. From a principal components analysis (SPSS, Ver 20.0) performed to analyze the possible sources of PM10 in the industrial region, five main factors were determined. Factor 1 (Si, Al), which accounted for 15.8% of the total variance, was mostly affected by soil and dust from manufacturing facilities nearby, Factors 2 (Cu, Ni), 3 (Zn, Pb), and 4 (Mn, Fe), which also accounted for some of variance, were mainly related to iron, non-ferrous metals, and other industrial manufacturing sources. Also, five factors determined to access possible sources of PM<sub>2.5</sub>, Factor 1 (Na, S), accounted for 13.5% of the total variance and was affected by sea-salt particles and fuel incineration sources, and Factors 2 (Ti, Mn), 3 (Pb, Cl), 4 (K, Al) also explained significant proportions of the variance. Theses factors mean that the PM2.5 emission sources may be considered as sources of incineration, and metals, and non-ferrous manufacturing industries.