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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Environmental Science International
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Journal DOI :
The Korean Environmental Sciences Society
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Volume & Issues
Volume 15, Issue 12 - Dec 2006
Volume 15, Issue 11 - Nov 2006
Volume 15, Issue 10 - Oct 2006
Volume 15, Issue 9 - Sep 2006
Volume 15, Issue 8 - Aug 2006
Volume 15, Issue 7 - Jul 2006
Volume 15, Issue 6 - Jun 2006
Volume 15, Issue 5 - May 2006
Volume 15, Issue 4 - Apr 2006
Volume 15, Issue 3 - Mar 2006
Volume 15, Issue 2 - Feb 2006
Volume 15, Issue 1 - Jan 2006
Selecting the target year
Evaluation Method for Improvement of Indoor Air Quality Using Mass Balance
Kim, Young-Hee ; Kim, Moon-Hyeon ; Yang, Won-Ho ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 913~918
DOI : 10.5322/JES.2006.15.10.913
Despite the wide distribution of air pollutants, the concentrations of indoor air pollutants may be the dominant risk factor in personal exposure due to the fact that most people spend an average of 80% of their time in enclosed buildings. Researches for improvement of indoor air quality have been developed such as installation of air cleaning device, ventilation system, titanium dioxide
coating and so on. However, it is difficult to evaluate the magnitude of improvement of indoor air quality in field study because indoor air quality can be affected by source generation, outdoor air level, ventilation, decay by reaction, temperature, humidity, mixing condition and so on. In this study, evaluation of reduction of formaldehyde and nitrogen dioxide emission rate in indoor environments by
coating material was carried out using mass balance model in indoor environment. we proposed the evaluation method of magnitude of improvement in indoor air quality, considering outdoor level and ventilation. Since simple indoor concentration measurements could not properly evaluate the indoor air quality, outdoor level and ventilation should be considered when evaluate the indoor net quality.
Numerical Simulation of Effect on Atmospheric Flow Field by Development of Coastal Area
Lee, Sang-Deug ; Mun, Tae-Ryong ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 919~928
DOI : 10.5322/JES.2006.15.10.919
The present study applied an atmospheric flow field model in Gwangyang-Bay which can predict local sea/land breezes formed in a complex terrain lot the development of a model that can predict short term concentration of air pollution. Estimated values from the conduct of the atmospheric flow field were used to evaluate and compare with observation data of the meteorological stations in Yeosu and the Yeosu airport, and the effect of micrometeorology of surround region by the coastal area reclamation was predicted by using the estimated values, Simulation results, a nighttime is appeared plainly land breezes of the Gwangyang-bay direction according to a mountain wind that formed in the Mt. of Baekwooun, Mt. of Youngchui. Land winds is formed clockwise circulation in the north, clockwise reverse direction in the south with Gangyang-bay as the center. Compared with model and observation value, Temperature is tend to appeared some highly simulation value in the night, observation value in the daytime in two sites all, but it is veil accorded generally, the pattern of one period can know very the similarity. And also, wind speed and wind direction is some appeared the error of observation value and calculation results in crossing time of the land wind and sea land, it can see that reproducibility is generally good, is very appeared the change land wind in the nighttime, the change of sea wind in the daytime. And also, according to change of the utilization coefficient of soil before and after development with Gwangyang-Bay area as the center. Temperature after development was high
in the 14 hoots, also was tend to appear lowly
in the 02 hours, the change of u, v component is comparatively tend to reduced sea wind and land wind, it is affected ascending air current and frictional power of the earth surface according to inequality heating of the generation of earth surface.
Estimation of Source Emission Rate on Volatile Organic Compounds and Formaldehyde Using Indoor Air Quality Modeling in New Apartment
Sim, Sang-Hyo ; Kim, Yoon-Shin ; Yang, Won-Ho ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 929~933
DOI : 10.5322/JES.2006.15.10.929
Indoor air quality is the dominant contributor to total personal exposure because most people spend a majority of their time Indoors. Especially when indoor environments have sources of contaminants, exposure to in-door air can potentially pose a greater threat than exposure to ambient air. In this study, estimations of volatile organic compounds and formaldehyde omission rate in indoor environments of new apartments were carried out using mass balance model in indoor environment, because indoor air quality can be affected by source generation, outdoor air level, ventilation, decay by reaction, temperature, humidity, mixing condition and so on. Considering the estimated emission rate of volatile organic compounds and formaldehyde, it Is suggested that new apartment should be designed and constructed in the aspect of using construction materials to emit low hazardous air pollutants.
A Study on Pollution Property of Urban River Inflow in Regulating Reservoir
Chang, In-Soo ; Park, Ki-Bum ; Lee, Won-Ho ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 935~943
DOI : 10.5322/JES.2006.15.10.935
This study focuses on analyzing the inflow characteristic of contaminants of city water that flows into a main water system like a reservoir, and intends to provide basic data which can be efficiently reflected on water quality management policy and decision making of a reservoir. The conclusion obtained from the analysis of the inflow of a main water system by analyzing the inflow property of city water contaminants is as follows. In the case of Chungju-cheon stream which is the city water, pollution load from the basic outflow is low when it rains, and with high load of basic outflow during the dry season, due to the discharge of pollutants from the city, the quality of water becomes worse. In the case of Chungju-cheon stream, average BOD is
when it rains, and the contaminants increase and flow in about 7.8% compared to the average BOD during the average droughty season. The average SS concentration in water is
and increased 97.2% compared to the average droughty season.
Study on Sludge Thickening with Mesh is Used as Filtration Msdia
Kim, Boo-Gil ; Park, Min-Soo ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 945~949
DOI : 10.5322/JES.2006.15.10.945
For a membrane bio-reactor, it is possible to fillet and separate activated sludge and effluent by head loss of centimeters, if non-woven fabric material is used as titration media. However, if non-woven fabric material is used to thicken high-concentration sludge, excessive sludge attachment causes the rapid decrease of flux. Mesh with fore sizes of
allows for easy separation of attached sludge. This study examined the possibility of mesh as filtration media. Existing close-flow filtration process, which requires maintaining sludge movement, makes It difficult to obtain high thickening rate. With a view of complementing this weakness, this study has made an experimental examination on how high-concentration sludge (about 3,000mg/L to 10,000mg/L) will be filtered and thickened when mesh module is submersed in the bio-reactor. Effluent flowed from the bottom of the bio-reactor by head loss of 65cm. In case of pore size of
, SS showed high recovery of 80% to 96%; therefore, it has been decided that mesh can be used as filtration media. Filtration lasted for more than 9 hours, until sludge with 9,000mg/L in MLSS concentration was thickened 9 times as dense. In the range from 3,610mg/L to 9,060mg/L in MLSS concentration, it was possible to obtain effluent with less than 2mg/L in MLSS concentration within 10 minutes.
The Estimation of Environmental Capacity in the Gamak Bay Using an Eco-hydrodynamic Model
Kang, Hoon ; Kim, Jong-Gu ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 951~960
DOI : 10.5322/JES.2006.15.10.951
The eco-hydrodynamic model was used to estimate the environmental capacity in Gamak Bay. It is composed of the three-dimensional hydrodynamic model for the simulation of water flow and ecosystem model for the simulation of phytoplankton. As the results of three-dimensional hydrodynamic simulation, the computed tidal currents are toward the inner part of bay through Yeosu Harbor and the southern mouth of the bay during the flood tide, and being in the opposite direction during the ebb tide. The computed residual currents were dominated southward flow at Yeosu Harbor and sea flow at mouth of bay, The comparison between the simulated and observed tidal ellipses at three station showed fairly good agreement. The distributions of COD in the Gamak bay were simulated and reproduced by an ecosystem model. The simulated results of COD were fairly good coincided with the observed values within relative error of 1.93%, correlation coefficient(r) of 0.88. In order to estimate the environmental capacity in Gamak bay, the simulations were performed by controlling quantitatively the pollution loads with an ecosystem model. In case the pollution loads including streams become 10 times as high as the present loads, the results showed the concentration of COD to be
, which is the third class criterion of Korean standards for marine water quality In case the pollution loads including streams become 30 times as high as the present loads, the results showed the concentration of COD to be
, which is the third class criterion of Korean standards for marine water quality. In case the pollution loads including streams become 50 times as high as the present loads, the results showed the concentration of COD to be
, which is the third class criterion of Korean standards for marine water quality.
Growth of the Indigenous Red-tide Phytoplankton Assemblage with the Addition of Limiting Nutrients
Lee, Young-Sik ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 961~966
DOI : 10.5322/JES.2006.15.10.961
An algal assay procedure using an indigenous phytoplankton assemblage was tested to estimate the propagation of red tide phytoplankton species and determine the optimal time interval at which to measure growth yield in eutrophic marine waters where red tides frequently occur. Various red tide phytoplankton species were propagated on a large scale by adding nitrogen or phosphorous. This procedure was useful for estimating the limiting nutrient, elucidating the mechanisms underlying red tides, and determining the levels of increases in organic matter in eutrophic coastal waters. The algal assay using indigenous C. polykrikoides showed that this species did not always propagate, apparently because of very low concentrations of trigger elements that are necessary for its growth, rather than as a result of other environmental characteristics, e.g., water temperature or stress from sampling. In the winter, when water temperatures are lower than in spring, summer, or autumn, maximum propagation and the limiting nutrient could be estimated by measuring phytoplankton biomass at 2 - 3-day intervals. However, in the other seasons, when water temperatures are higher, phytoplankton biomass should be measured at 2-day intervals. In particular, daily monitoring will be required to determine precise growth yields in warm seasons.
A Study of Optimal Water Supply Planning in Mountainous Area
Kim, Ji-Hak ; Park, Ki-Bum ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 967~973
DOI : 10.5322/JES.2006.15.10.967
In this study used tank model and specific discharge to calculate low-flow of mountain basin and supply data that need in water resources plan. Low-flow is calculated byspecific discharge and area ratio method as resulted that calculate storage of low-flow by tank model was construed that showd all similar aspect. In judged to help in water resources plan establishment calculating low-flow using model to supplement uncertainty of observed data in that calculate of low-flow ungaged mountain area. It shows by economical and realistic plan until 12 years after development that run parallel and use economic performance analysis result valley flow and groundwater. But wide area water services and Chungju dam since 12 years onward was expose that is economic.
Acid Fermentation Characteristic of Food Wastes According to the Organic Loading Rate
Park, Jin-Sik ; Ahn, Chul-Woo ; Jang, Seong-Ho ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 975~982
DOI : 10.5322/JES.2006.15.10.975
This study has been conducted to optimum operating conditions for effective acid fermentation according to OLR(organic loading rate) in the mesophilic and thermophilic acid fermentation process. The results are summarized as follows. In order to obtain reasonable acid fermentation efficiency in performing acid fermentation of food wastes in thermophilic condition, organic loading rate was required below 20 gVS/L.d. As
of thermophilic acid fermented food wastes In organic loading rate 20 gVS/L.d were 18.9, 73.4 respectively, it was possible to utilize as external carbon source for denitrification in sewage treatment plant after solid-liquid separation as well as co-digestion of fermented food wastes and sewage sludge.
Antibacterial Activities of Ginkgo Biloba Leaves Extracts Against Isolated Bacteria from Museums
Kwon, Young-Suk ; Cho, Hyun-Hok ; Jeong, Seong-Yun ; Lee, Sang-Youb ; Kim, Min-Ju ; Cho, Sun-Ja ; Lee, Sang-Joon ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 983~988
DOI : 10.5322/JES.2006.15.10.983
The textile remains have been affected largely by environmental factors including microorganisms because they were composed of organic compounds to be easy to damage. So, we selected 8 strains of the 131 isolated strains from museum environments and textile remains by high pretense activity, and identified them for measuring the antibacterial activity of Gingko biloba extracts. They were identified Genus Arthrobacter spp. 3 strains (Arthrobacter nicotiannae A12, Arthrobacter sp B12, Arthrobacter oxidans B13), Cenus Bacillus spp. 2 strains (Bacillus licheniformis D9, Bacillus cereus D33), Genus Pseudomonas spp. 2 strains (Pseudomonas putida A24, Pseufomonas fluorescene C21) and a Genus Staphylococcus sp. 1 strain (Staphylococcus pasteuri D3) as closest strains through the blast search of NCBI. Though antibacterial activity of the extracts of Gingko biloba leaves as MIC was lower than that of other pharmaceutical antibiotics. However the extracts was crude extracts, the extracts might have good antibacterial against most of the isolates from museum. Especially, the antifungal activity of Gingko biloba is known previously, the extracts of Gingko biloba leaves has possibility of usage as a good natural material for conservation of remains.
Analysis of Management Unit on Forest Area for Active Mountain Villages - Case of Ishigawa-gen in Japan -
Lee, Sung-Gie ; Son, Seog-Gu ; Jeong, Jin-Heon ; Shin, Byung-Cheol ; Chung, Young-Gyo ;
Journal of Environmental Science International, volume 15, issue 10, 2006, Pages 989~995
DOI : 10.5322/JES.2006.15.10.989
Using the principal component analysis and clustering Forest resources are consistently necessary in the future. It takes much time to produce and breed them. However it is difficult to do due to recent social situation. Considering global environment, forest policy should be considered as a global scale rather than a regional one. At least, the policy needs a national scale concern. In order to support forestry, elementary data are needed. In this study, forest characteristics in Ishigawa-gen province have been analyzed through main component analysis and clustering. The results are shown in fig.5 and fig.6.