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최금찬,박출재,박정호,임경택 동아대학교 환경문제연구소 1995 硏究報告 Vol.18 No.1
Acid Rain has been investigated in Pusan Area. The range of pH indicated at 1st point to 4.05-7.2, 2nd point to 4.87-7.1, 3rd point 5.0-7.0 individually. Average pH value was decreased during small rainfall, the rainfall amount was directly related to pH in every points. Frequency ratio of pH below 5.6 in each point were resulted to 75% at 1st point, 73% at 2nd point, 42% 3rd point.
대기 중 휘발성 유기화합물의 Advanced Technology에 대한 실험비교
최금찬,안병주,김석택,김찬훈,정창훈,서정민,유수영 동아대학교 환경문제연구소 2000 硏究報告 Vol.23 No.1
Nowaday, Advanced technology has been applied to organic destruction technologies that are alternatives to incineration. Plasma, photolysis, and Photocatalytic oxidation processes are an emerging advanced technologies for the abatement of volatile organic compounds(VOCs) in atmospheric pressure air streams, so we has been used these technologies for destruction of VOCs. TCE, Benzene, Toluene, and Xylene were selected as objective materials. We have been studied each process and found many types of reaction parameters which effect on treatment efficiency. So combination processes, which are plasma-photocatalytic oxidation process and photolysis-photocatalytic oxidation process, have been used to increase destruction efficiency. Analysis of above materials and byproducts was carried out by GC-FID.
최금찬,전기일,미키오, 카사하라 동아대학교 환경문제연구소 1990 硏究報告 Vol.13 No.1
Dry and wet deposition were considered for aerosol particles. In wet deposition, aerosol particles are become nuclei to make cloud particles, the generated cloud paticles are removed by settling as rainfalls. Also, gases are absorbed in cloud particles and rainfalls in the atmosphere. In dry deposition, deposition rate is largely depends on the deposited surface areas and its properties. Some dispersion models are able to apply to obtain good results for dry and wet deposition.
디젤자동차배출입자의 발생원동정 및 배출특성에 관한 연구
최금찬,조정구 동아대학교 환경문제연구소 1991 硏究報告 Vol.14 No.2
The purpose of this study is to characterize the emission of diesel vehicles. It had been measured the particle size distribution, particle concentrations, and ionic components through the emission for diesel vehicles. The particle emission of diesel vehicles may be changed to emission partterns accoring to fuel, combustion conditions, and ionic components.
최금찬,성낙창,김장호,서정민,황성욱 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1
We get the conclusion of the ionic components of sample and the concentration of metal elements which is collected for acid composition substances using Dry Deposion, Dust Jar method at five points in Pusan. It appears higher ionic concentration from the last of February to the middle of May. It appears higher ionic concentration according to the increasing of collecting period in cation. It is higher ionic concentration according to the passing of the time at all sites in anion. The sum of cation equivalent concentration is higher than the sum of anion equivalent concentration in comparing ionic equivalent concentration. The equivalent concentration of SO₄^(2-), NO^(3-) that is gussed acid density is predominient in anion.
플라즈마 광촉매 복합 공정을 이용한 악취물질 중 TEA, MEK의 분해처리
최금찬,정창훈 한국환경과학회 2003 한국환경과학회지 Vol.12 No.12
Plasma-photocatalytic oxidation process was applied in the decomposition of Triethylamine(TEA) and Methyl ethyl ketone(MEK). Plasma reactor was made entirely of pyrex glass and consists of 24 mm inner diameter, 1,800 mm length and discharge electrode of 0.4 mm stainless steel. And initial concentrations of TEA and MEK for plasma-photocatalytic oxidation are 100 ppm. Odor gas samples were taken by gas-tight syringe from a glass sampling bulb which was located at reactor inlet and outlet, and TEA and MEK were determined by GC-FID. For plasma process, the decomposition efficiency of TEA and MEK were evaluated by varying different flowrates and decomposition efficiency of TEA and MEK increased considerably with decreasing treatment flowrates. For photocatalytic oxidation process, also the decomposition efficiency of TEA and MEK increased considerably with decreasing treatment flowrates. The decomposition efficiency of MEK was 57.80/0, 34.2%, 18.8% respectively and the decomposition efficiency of TEA was reached all 100%. This result is higher than that of plasma process only. From this study, the results indicate that plasma-photocatalytic oxidation process is ideal for treatment of TEA and MEK.
PIXE 분석법에 의한 에어로졸의 원소분석 : Preparation of Standard Samples and Calibration Test
林警澤,崔琴纂 동아대학교 환경문제연구소 1991 硏究報告 Vol.14 No.1
Particle Induced X-Ray Emission (PIXE), analysis is on of the most useful methods which can determine the elemental concentration of aerosol particlesin nano-gram range. It is the main object of this paper to establish the measurement system and procedure of PIXE analysis. The standard samples were prepared to calibrate the PIXE analysis by three different techniques. The linear relationships between the peak counts from PIXE spectra and the mass density from RBS spectra were obtained for each standardized element under the applied measurement geometry and conditions. The sensitivity curves for PIXE analysis were determined from these relationships.
충격기류식 여과집진장치의 펄스간격 및 분사거리에 따른 압력손실변화에 관한 기초 연구
서정민,최금찬,박정호 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3
The change of pressure drop according to the change in the inlet concentration, pulse interval, and injection distance of pulse air jet type bag filters, and the effect of venturi installation are as follows. The pressure drop with the range of 30 to 50㎜H₂O varies according to the injection distance with 30, 50, 70, 90sec and the inlet concentration of venture built-in fabric filters. For the lower concentration of 0.5g/m³ and lg/m³, the pressure drop(ΔP) was stable 60 to 90minutes after operation. For the higher concentration of 3g/m³, as 4P continues to go up, pulse interval should be set shorter than 30 seconds. The pressure drop with the injection distance of 110㎜, when inlet dust concentration is 0.5g/m³ or lg/m³, is 1.3 to 2 lower than with the injection distance of 50, 160, and 220㎜, which means that the inflow amount of the secondary air by the instant acceleration is large. The injection distance of 2g/m³ and 3g/m³ has the similar pressure distribution. The higher inlet concentration is, the more important pulse interval is than injection distance. The pressure drop has proved to be larger when inlet concentration is lower and injection distance closer, on condition that the venturi is installed. The change in the pressure drop was smallest when injection distance was 50㎜, followed by 220㎜, 160㎜, and 110㎜.
林警澤,崔琴簒 동아대학교 환경문제연구소 1984 硏究報告 Vol.7 No.2
Treatment of inhalable particulate is important in a view of respirable range. In a uniform Electrified Fabric Filter, the mobility of particulate with charge is increased. In this paper, special interest was focused on reduced pressure drop because of electrical charging and on reduced P. D. R. (ratio of specific dust resistence) according to filtering time. Apparently the reduction in pressure drop for a particular dust loading occurs because the presence of particles charges induces electric fields which cause the particles to migrate to specific sites. The electric forces also apparently result in improvement in collection efficiency. If the electrically augmented filter concept proves viable for industrial application it could be useful fabric filter system.