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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
Marine Ecosystem Response to Nutrient Input Reduction in Jinhae Bay, South Korea
Oh, Hyun-Taik ; Lee, Won-Chan ; Koo, Jun-Ho ; Park, Sung-Eun ; Hong, Sok-Jin ; Jung, Rae-Hong ; Park, Jong-Soo ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 819~827
DOI : 10.5322/JES.2006.15.9.819
We study on the dynamic interaction with a simulated physical-biological coupled model response to nutrient reduction scenario in Jinhae Bay. According to the low relative errors, high regression coefficients of COD and DIN, and realistic distribution in comparison to the observation, our coupled model could be applicable for assessing the marine ecosystem response to nutrient input reduction in Jinhae Bay. Due to the new construction and expansion of sewage treatment plant from our government, we reduce 50% nutrient inputs near Masan Bay and sewage treatment plant. COD achieves Level II in Korea standard of the water quality from the middle of the Masan Bay to all around Jinhae Bay except the inner Masan Bay remaining at Level III. When our experiment reduces 50% nutrient inputs near Masan Bay and Dukdong sewage treatment plant simultaneously, COD decreases to about 0.1-1.2 mg/L
. The COD from the middle of the Masan Bay to Jinhae Bay achieves Level II.
Pilot Scale Assessment of DOC and THMs Removal in Conventional Water Treatment System
Lee, Choong-Dae ; Lee, Yoon-Jin ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 829~834
DOI : 10.5322/JES.2006.15.9.829
This research aims to investigate the behavior of organic matter that causes bacterial re-growth and the formation of disinfectant by-products such as THM in water treatment, and to optimize conditions for a more efficient and conventional water facility. THM removed 51 % and 12 % through coagulation/sedimentation and filtration using a selected conventional system. In this experiment, the removal ratio of DOC was highest at 68 % when the Gt value was 42,000 and lowest at 41 % when the Gt value was 30,000. 77-84 % of total DOC was removed during coagulation/sedimentation, and 15-23 % was removed during filtration. When Gt values were between 30,000 and 66,000, over 50 % of high molecular matter above 10 K during coagulation/sedimentation was removed. Turbidity removed 98 % when the G1 value was 66,000. As the Gt value increased, the turbidity removal ratio increased. Turbidity removed over 20 % during the filtration process.
Analysis of Local Wind in Busan Metropolitan area According to Wind Sector Division - Part I : Coarse Division of Wind Sector using Meteorological Observation Data -
Lee, Hwa-Woon ; Jung, Woo-Sik ; Leem, Heon-Ho ; Lee, Kwi-Ok ; Choi, Hyun-Jung ; Ji, Hyo-Eun ; Lee, Hyun-Ju ; Sung, Kyoung-Hee ; Do, Woo-Gon ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 835~846
DOI : 10.5322/JES.2006.15.9.835
In this study, climate analysis and wind sector division were conducted for a propriety assessment to determine the location of air quality monitoring sites in the Busan metropolitan area. The results based on the meteorological data
indicated hat air temperature is strongly correlated between 9 atmospheric monitoring sites, while wind speed and direction are not. This is because wind is strongly affected by the surrounding terrain and the obstacles such as building and tree. in the next stage, we performed cluster analysis to divide wind sector over the Busan metropolitan area. The cluster analysis showed that the Busan metropolitan area is divided into 6 wind sectors. However 1 downtown and 2 suburbs an area covering significantly broad region in Busan are not divided into independent sectors, because of the absence of atmospheric monitoring site. As such, the Busan metropolitan area is finally divided into 9 sectors.
Formation and Chemical Characteristics of Dewfall in 2005 at Busan
Jeon, Byung-Il ; Hwang, Yong-Sik ; Park, Gwang-Soon ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 847~853
DOI : 10.5322/JES.2006.15.9.847
In order to understand chemical characteristics and formation of dewfall in Busan, we analysed monthly distribution of dewfall, and investigated its chemical composition of dewfall. This study used the modified teflon plate
at Jangyongsil science high school from June 2005 to October 2005. In order to estimate qualitatively water soluble components, IC, ICP and UV methods for water soluble ions are also used respectively. Dewfall amount of sampling periods (26 day) collected 1.29 mm. Distribution of water soluble ions in dewfall founded the highest concentration
during the June. pH was the lowest by 5.12 June, and October (pH 6.68) by most high and average pH was 5.46. Monthly equivalent ratio of
showed the highest value (2.94) during the September, the lowest value (1.77) during the July, and the mean value was 3.45.
Development for UV/TiO
Photocatalytic Oxidation Indoor Air Compound Process
Jeon, Bo-Kyung ; Choi, Kum-Chan ; Suh, Jeong-Min ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 855~864
DOI : 10.5322/JES.2006.15.9.855
This study introduces a method to eliminate formaldehyde and benzene, toluene from indoor air by means of a photocatalytic oxidation reaction. In the method introduced, for the good performance of the reaction, the effect and interactions of the
catalyst and ultraviolet in photocatalytic degradation on the reaction area, dosages of catalysts, humidity and light should be precisely examined and controled. Experiments has been carried out under various intensities of UV light and initial concentrations of formaldehyde, benzene and toluene to investigate the removal efficiency of the pollutants. Reactors in the experiments consist of an annular type Pyrex glass flow reactor and an 11W germicidal lamp. Results of the experiments showed reduction of formaldehyde, benzene and toluene in ultraviolet
activated carbon processes (photooxidation-photocatalytic oxidation-adsorption processes), from 98% to 90%, from 98% to 93% and from 99% to 97% respectively. Form the results we can get a conclusion that a ultraviolet/Tio2/activated carbon system used in the method introduced is a powerful one for th treatment of formaldehyde, benzene and toluene of indoor spaces.
Application of Discrete Wavelet Transform for Detection of Long- and Short-Term Components in Real-Time TOC Data
Jin, Young-Hoon ; Park, Sung-Chun ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 865~870
DOI : 10.5322/JES.2006.15.9.865
Recently, Total Organic Carbon (TOC) which can be measured instantly can be used as an organic pollutant index instead of BOD or COD due to the diversity of pollutants and non-degradable problem. The primary purpose of the present study is to reveal the properties of time series data for TOC which have been measured by real-time monitoring in Juam Lake and, in particularly, to understand the long- and short-term characteristics with the extraction of the respective components based on the different return periods. For the purpose, we proposed Discrete Wavelet Transform (DWT) as the methodology. The results from the DWT showed that the different components according to the respective periodicities could be extracted from the time series data for TOC and the variation of each component with respect to time could emerge from the return periods and the respective energy ratios of the decomposed components against the raw data.
Management of Water Pumping System in Coastal Area of Jeju City Based on Coastal Landscape
Cho, Eun-Il ; Lee, Byung-Gul ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 871~880
DOI : 10.5322/JES.2006.15.9.871
Water management treatment of coastal region has been an important problem in Jeju city since the distributions of pipeline of the pumping system made a bad view in coastal region. To solve the problem, we observed the pipelines that are on the surface around the coastal region from Tapdong to Doduhang. From the observations, we found that Todong and Dodu areas were not unsightliness because the all pipelines were located in underground. However, the other areas, such area Yongdam, Handugi, Yongdam fishing village, had a serious problem for the coastal landscape view. To solve the problem, at we estimated coastal land color characteristics of Jeju city based on the observation of the pipelines. The estimated color panel shows that the green, blue and grey colors are a dominant factors of the Jeju coastal region. Based on the color panel, we proposed two methods, that is, one is a short time treatment, the other is a long time one. The short is based on the colour treatment, which is pipeline colour changing into surround natural one. The long time is the construction plan design method. Although the later method was very useful in Jeju island. However, it takes a lot of time and money. Therefore, in the situation, the short time is the better than the long time one.
Numerical Analysis on the Beach Erosion Prevention Capability of Submerged Breakwaters
Kim, In-Chul ; Yoon, Jong-Sung ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 881~886
DOI : 10.5322/JES.2006.15.9.881
The purpose of this research is to examine the beach erosion prevention capability of submerged breakwaters under wave energy condition. To accomplish this objective, the computational domain was divided into two do-mains : the large and the detailed domain for the Song-Do beach. For each computational domain, numerical models for calculating transformation, wave induced current and beach erosion were used and also these numerical models were carefully applied to three experimental cases such as 1) the present beach condition, 2) the condition for which submerged breakwaters are installed about 240m from the shoreline of beach enlarged by artificial nourishments. The results of this research show that if storm waves attack the present beach, the erosion occurs widely all over the beach. However, when the submerged breakwaters are installed in addition to the artificial nourishments, storm waves can be adequately controlled and strong wave induced currents occur only around the submerged breakwaters resulting in the beach evolution appearing locally only at the western end of the beach.
Study of Design Flood Estimation by Watershed Characteristics
Park, Ki-Bum ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 887~895
DOI : 10.5322/JES.2006.15.9.887
Through this research of the analysis on the frequency flood discharges regarding basin property factors, a linear regression system was introduced, and as a result, the item with the highest correlation with the frequency flood discharges from Nakdong river basin is the basin area, and the second highest is the average width of basin and the river length. The following results were obtained after looking at the multi correlation between the flood discharge and the collected basin property factors using the data from the established river maintenance master plan of the one hundred twenty-five rivers in the Nakdong river basin. The result of analysis on multivariate correlation between the flood discharges and the most basic data in determining the flood discharges as basin area, river length, basin slope, river slope, average width of basin, shape factor and probability precipitation showed more than 0.9 of correlation in terms of the multi correlation coefficient and more than 0.85 for the determination coefficient. The model which induced a regression system through multi correlation analysis using basin property factors is concluded to be a good reference in estimating the design flood discharge of unmeasured basin.
Co-digestion of Thermophilic Acid-fermented Food Wastes and Sewage Sludge
Ahn, Chul-Woo ; Jang, Seong-Ho ; Park, Jin-Sik ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 897~905
DOI : 10.5322/JES.2006.15.9.897
This study has been conducted to investigate biodegradation characteristics and optimum mixing ratio for co-digestion with thermophilic acid-fermented food waste and sewage sludge using batch anaerobic digester. As the basis operating conditions for anaerobic digestion, the reaction temperature was controlled
and stirrer was set 70rpm. Thermophilic acid-fermented food waste and sewage sludge were mixed at the ratio of 10:0, 7:3, 5:5, 3:7, 0:10 and 5;5(food waste : sewage sludge) as the influent substrates. In results of co-digestion according to mixing ratio of thermophilic fermented food wastes and sewage sludge in batch mesophilic anaerobic digestion reactor,
of methane production rate at 1:1 mixing ratio was more than that of any other mixing ratios. Compared with
of methane production rate at 1:1 mixing ratio of food wastes and sewage sludge, pretreatment of food wastes by thermophilic acid fermentation was more effective in co-digestion with sewage sludge.
Questioning Styles in the Middle School Environmental Textbooks
Huh, Man-Kyu ; Huh, Hong-Wook ; Moon, Do-Hoo ; Moon, Sung-Gi ;
Journal of Environmental Science International, volume 15, issue 9, 2006, Pages 907~912
DOI : 10.5322/JES.2006.15.9.907
The study is conducted to analyze the questioning styles in three middle school environmental textbooks in terms of frequency, type, and placement of questions. It is also to analyse and compare the kinds of scientific processes elicited by the questions in the topics of textbook. The instrument was the Textbook Questioning Strategies Assesment Instrument (TQSAI) which was developed the Cooperative Teacher Preparation Program, University of California. The mean number of questions per topic was 4.0 and the ratio of questions to sentences was 3.8%. The numbers of empirical and non-empirical questions were 52.5% and 47.5% for textbook D, 56.6% and 43.4% for textbook J, and 92.7% and 7.3% for textbook K, respectively. The open-hearted question was the highest in all types of questions for three middle school environmental textbooks. The explanatory question was the highest in all characteristics of questions. The types of various questions were distributed throughout textbooks including the green field, debate-discussion, examination, and so on.