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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society for Atmospheric Environment
Journal Basic Information
Journal DOI :
Korean Society for Atmospheric Environment
Editor in Chief :
Volume & Issues
Volume 20, Issue 6 - Dec 2004
Volume 20, Issue 4 - Aug 2004
Volume 20, Issue 3 - Jun 2004
Volume 20, Issue 2 - Apr 2004
Volume 20, Issue E1 - Mar 2004
Volume 20, Issue 1 - Feb 2004
Volume 20, Issue 5 - Jan 2004
Volume 20, Issue E2 - 00 2004
Selecting the target year
A Study on the Estimation of Air Pollutants Emission Factors in Electric Power Plants
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 281~290
The main purpose of this study was to characterize the air pollutants emission factors in electric power plant (EPP) using fossil fuels. The electric power plant is a major air pollution source, thus knowing the emission characteristics of electric power plant is very important to develop a control strategy. The major air pollutants of concern from EPP slacks are particulate matter (PM), sulfur oxides (SOx), nitrogen oxides (NOx), carbon monoxide (CO) and heavy metals. Throughout the study, the following results are estimated - PM : 8.671E-05 ∼ 8.724E+01 PM emission (kg) per fuel burned (ton) - SOx : 4.149E-04∼7.877E+01 SOx emission (kg) per fuel burned (ton) - NOx 1.578E-02∼9.857E+00 NOx emission (kg) per fuel burned (ton) - CO : 3.800E-04∼1.291E+00 CO emission (kg) per fuel burned (ton) - Hg : 1.220E+01∼3.108E+02 Hg emission (mg) per fuel burned(ton) From the statistical analysis by Wilcoxon signed ranks test between the emission factors of ours and U.S. EPA's, we can yielded that : p 〉0.05.
Removal of NO Using CuO/3Al
Catalyst Impregnated Ceramic Candle Filters
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 291~302
catalyst impregnated ceramic candle filters for nitrogen oxides removal were prepared by porous mullite(
) support and CuO catalyst deposited on this support to achieve uniformly dispersed CuO deposition, which are impregnated into the pores of available alumino-silicate ceramic candle filter. The CuO/3
catalyst impregnated ceramic candle filters were characterized by XRD, BET, air permeability, pore size, SEM and catalytic tests in the reduction of NOx by NH
. The observed effects of CuO/3
impregnated ceramic candle filters in SCR reaction are as follows : (1) when the content of CuO catalyst increased further, activity of NO increased. (2) NO conversion at first increased with temperature and then decreased at high temperatures (above 40
), possibly due to the occurrence of the ammonia oxidation reaction. (3) In pilot plant test for 3 months, NO conversion was greater than 90%.
Numerical Study on Warming Effect Due to Green House Gas in Microscale Atmospheric Domain
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 303~315
The change of land use such as the construction of way in mountainous area and tunnel leads to the quantitative change of the greenhouse gas. This study tried to clarify the effect of the change of land use around Miryang Ice Valley on thermal environment of micro-meteorological scale by numerical experiment. We carried out several numerical experiment under different atmospheric conditions with different amount of greenhouse gases. Heating rate increased by the greenhouse gas in the ground level is average of 0.0073 K/day. And the increasing rate if smaller than the daily average heat crossing quantity.
A Study on the Development of Source Profiles for Fine Particles (PM
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 317~330
The Purpose of this study was to develop the P
source Profiles, which are mass abundances (fraction of total mass) of a chemical species in P
source emissions. The source categories studied were soil, road dust, gasoline and diesel vehicles, industrial source, municipal incinerator, coal-fired power plant, biomass burning, and marine. The chemicals analyzed were ions. elements. and carbons. From this study, soil source had the crustal components such as Si, hi, and Fe. In the case of road dust. Si, OC, Ca, Fe had large abundances. The abundant species were S
, and EC in the gasoline vehicle and EC, OC, C
, and S
in the diesel vehicle. The main components were S
, S N
, and EC in the industrial source using bunker C oil as fuel, C
, Fe, and OC in the municipal incinerator source, and Si, Al, S
, and OC in the coal -fired power plant source. In the case of biomass burning, OC, EC, and C
were mainly emitted. The main components in marine were C
, and S
PAHs Source Fingerprints for Municipal Incinerator, Motor Vehicle Fuels and Industrial Boilers Emission
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 331~343
The results of individual PAH source profiles that can be applied to receptor model are as follows. The sum of 16 PAH concentrations was 391.41 ng/S㎥ in a tunnel. Phenanthrene was the most abundant compound among 16 PAH, and then pyrene, fluoranthene, anthracene, and naphthalene can be seen in elevated contents. 11,056.61 ng/S㎥ of 16 PAH concentrations in BC oil boiler was two times higher than 6,582.57 ng/S㎥) of those in LNG boiler. Naphthalene was the most abundant compound in both facilities. Phenanthrene, anthracene, and acenaphthylene were the second dominant compound group in order from both facilities. BC oil boiler had relatively high concentration of pyrene compared to LNG boiler that had high concentration of fluorene and did not detect pyrene. The sum of 16 PAH concentrations emitted from MSW incinerators after APCD (air pollution control device) was three times higher than those from MSW incinerators before APCD. However, the concentrations of more than 4-ring PAH compounds (e.g., benzo (a)anthracene) before APCD were higher than those after APCD. This fact implies that PAHs generated by combustion process are eliminated in APCD and they are continuously produced in stack or atmosphere by PAHs precursors.
Effects of Late Sea-breeze on Ozone Distributions in the Coastal Urban Area
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 345~360
The late sea-breeze and its impacts on ozone distributions were investigated during April to September from 1998 to 2002, in the Busan metropolitan area (including surrounding areas) using the surface ozone concentrations (obtained at 9 monitoring sites), local meteorological variables (obtained near the shore), together with synoptic data. The urban scale ozone concentration was also simulated using the MM5/UAM-V to better understand the role of late sea-breeze in Busan. The results from observation study showed that most of the late sea-breeze occurred when weak offshore synoptic flow (northwesterly) suppressed development of sea - breeze, and the ozone concentration level and frequencies exceeding ozone standard increased with the onset time of sea breeze. We also found that the late sea-breeze clearly induces relatively weak wind speed and high temperature during the daytime As a result it enhances the photochemical ozone accumulation and delays the occurrence time of the averaged maximum ozone concentrations. The results of simulation for high ozone episode (24 August, 2001) by MM5/UAM -V revealed that the late sea-breeze interacted with weak offshore synoptic wind can contribute significantly to high ozone concentration in the coastal urban area. The simulated horizontal and vertical distribution of ozone concentration indicated that ozone can be accumulated over the sea under stagnant condition and return to the land in the late afternoon with the sea breeze, suggesting both the relationship between late sea-breeze and recirculation and the importance of late sea -breeze effects influencing severe ozone pollution in Busan.
Examination of Dust Trapping Mechanism in a Metal Fiber Filter-bed
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 361~369
A metal fiber bed has seldom been applied to the practical filtration process despite its excellent mechanical and chemical stability. The filter-bed used in this work was highly porous with open structure, of which apparent porosity was 80 ∼ 90%. Although pressure loss across the filter-bed was very low, separation efficiency was found to be quite high. This paper focuses on the basic filtration mechanisms of a metal filter-bed and a thin ceramic filter from fly ash for reference. The experimental parameters were face velocity, dust loading and porosity of filter-bed. Pressure drop increased with increasing face velocity and dust feeding load for both filters. It also showed that dust particles deposited in the deep flow path, finally resulting in clogging the pore channels. It thereby indicates that the dominating mechanism of the metal filter-bed would be depth filtration. Meanwhile, the thin fly ash composite filters trapped the aerated dust mainly on the surface of the filter medium, so that the instantaneously formed dust layer might cause a steep increase of pressure drop across the filtration system.
Specific Resistance (K
´) of Dust Layer Deposited on Porous Media
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 371~380
In the dust separation by using porous filter media, the structure of dust layer deposited on the filter surface of filter medium directly affects the effective filtration. The present study has investigated the specific resistance (K
') of the dust layer and its porosity (
) for three different filters; FA composite filter, metal fiber filter and stainless filter. The specific resistance (K
') increased and at the same time the cake porosity (
) decreased with the increase of filtration velocity, possibly due to the compressible effect of dust layer. However, under the low dust concentration, subsequent dust particles would block the open channels through the layer resulting in high specific resistance of the layer. The FA composite filter among three filters was shown to be the most effective filter for dust cake filtration at low filtration velocities less than 0.1 m/s for an approximate dust concentration of 5 g/㎥.
Comparison of Chemical Characteristics in Wet and Bulk Precipitation Collected in the Iksan Area
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 381~396
In order to understand the precipitation acidity and chemical composition of ion species in Iksan area as well as to know the difference of chemical characteristics in precipitation samples from the viewpoint of precipitation sampling method, precipitation samples were collected by wet-only automatic precipitation sampler and bulk manual precipitation sampler in Iksan, from March 2003 to August 2003. The mean pH of precipitation was 5.0. There was a little significant difference in the mean value of pH between automatic and manual sampler. However, pH values of some precipitation samples were lower in automatic sampler than in manual sampler, especially in case of precipitation samples with small rainfall for March 2003. The mean concentrations of each ions in precipitation were generally a little higher in precipitation samples collected by the manual sampler than in those collected by the automatic sampler because of accumulation of dry deposition on the surface of glass funnel installed at the manual sampler during the sampling period or no rainfall. Dominant species determining the acidity of precipitation, were N
for cations and nss-S
for anions. The mean concentration of N
eq/L and 9
eq/L for the automatic sampler and 40 ueq/L and 16 ueq/L for the manual sampler, respectively. In addition, nss-S
eq/L and 13
eq/L for the automatic sampler and 32
eq/L and 17
eq/L for the manual sampler, respectively. Although the concentrations of the acidifying ions of nss-S
were about 3 times higher than those for foreign pristine sites, precipitation acidity were estimated to be natural due to the neutralization reaction of the alkaline species of N
with its higher concentrations. Considering the ratios of nss-S
, it was found that ammonium sulphate was dominant in Iksan precipitation. The major non-sea salt ions were maximum concentrations for March, but decreased with increasing of precipitation amount.on amount.
Applicability of CCT-ICP-MS for the Determination of Trace Elements in Airborne Particulate Matters
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 397~409
There has been few studies of either domestic or international to apply CCT-ICP-MS for the precise analysis of As and Cr components associated with airborne particulate matter. To date, the use of CCT-ICP-MS is strongly recommended for the accurate analysis of the toxic trace metals; this is because CCT-ICP-MS technique prevents polyatomic spectral interferences involved in the determination of As and/or Cr components. Taking advantage of CCT-ICP-MS technique, the measurements of about 20 metals were undertaken in this study. The standard reference material (NIST SRM 2783) was used for analytical quality control. To improve analytical accuracy and of acid efficiency, we selected nitric acid based on a test of three kinds of acid for microwave digestion method 1 ) nitric acid. 2) nitric acid and hydrogen peroxide. and 3) nitric acid and perchloric acid. When this method was employed, relative errors to SRM values of Al, As, Cr Fe, Mg, Mn, Pb, Sb, V, and Zn fell below 20%, while those or Ca, Si, and Ti were higher than 20%. The overall results of our study show that the concentrations of As and V determined by CCT-ICP-MS were satisfied with the certificated values within a relative error of 20e1c, whereas those determined by ICP-MS were 10 times higher than the certificated values.
Synthesis and Analysis of Nanosized TiO
Particles Using a Tube Furnace
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 411~419
Titania particles are widely used as a photocatalyst to treat various contaminants in air and water. Titania particles were formed by vapor-phase oxidation of titanium tetraisopropoxide (TTIP) in a tube furnace between 773 and 1,273 K. The effect of process variables such as furnace temperature, flow rate of carrier air, and flow rate of sheath air on powder size and phase characteristics was investigated using a scanning mobility particle sizer (SMPS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The size distribution of synthesized titania particles was characterized with mode diameter and peak concentration. The mode diameter ranging from 20 to 80 nm decreased with increasing flow rates of sheath air and carrier air, and increased with increasing furnace temperature. The peak concentration increased with increasing flow rates of sheath air and carrier air The best synthetic condition for high production rate can be derived from the experimental data set represented by mode diameter and peak concentration. The crystal structure of synthesized titania particles was found to be anatase phase, ensuring high photocatalytic potential.
Measurement of Dry Deposition Flux of Air Pollutants to the Waterbody
Journal of Korean Society for Atmospheric Environment, volume 20, issue 3, 2004, Pages 421~426
Dry deposition fluxes of inorganic acidic species to the waterbody were measured by the dry deposition sampler (DDS). DDS was composed of three pans filled with pure water. An average concentration increase during the sampling time, after removing an abnormal value if existed, was considered as the input by deposition. Important operation parameters such as the amount of water used and sampling time were determined through a series of laboratory experiments. The deposition flux measured by DDS was compared with that by the water surface sampler developed by Yi et ai. (1997a,b).