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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 23, Issue 12 - Dec 2014
Volume 23, Issue 11 - Nov 2014
Volume 23, Issue 10 - Oct 2014
Volume 23, Issue 9 - Sep 2014
Volume 23, Issue 8 - Aug 2014
Volume 23, Issue 7 - Jul 2014
Volume 23, Issue 6 - Jun 2014
Volume 23, Issue 5 - May 2014
Volume 23, Issue 4 - Apr 2014
Volume 23, Issue 3 - Mar 2014
Volume 23, Issue 2 - Feb 2014
Volume 23, Issue 1 - Jan 2014
Selecting the target year
Comparison of Trace Element, Metal, and Metalloid Contents in North and South Korean Plants
Park, Jeong-Soo ; Chung, Ha-Sook ; Lee, Eun-Ju ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 995~1001
DOI : 10.5322/JESI.2014.23.6.995
When relations improve between North and South Korea, there will be demand for North Korean edible plants because of the low labor cost and similar environmental conditions. However, there is no reliable information about trace elements, metals, and metalloids in edible plants from North Korea. Selenium (Se) and germanium (Ge) have positive effects on basic human health and are therapeutical in diverse illnesses. Metal and metalloid (Cd, Pb) poisoning, on the other hand, can cause many health problems. Plants collected from North Korea had higher selenium content than those from South Korea. Although none of the collected species exceeded the permissible levels of cadmium and lead, their content in plants was significantly higher in North Korea than in South Korea. The high metal contents in plants collected from North Korea may be associated with the soil physicochemical properties as well as the accumulated amounts of elements in the soil.
Effects of Increased CO
and Temperature on the Growth of Four Diatom Species (Chaetoceros debilis, Chaetoceros didymus, Skeletonema costatum and Thalassiosira nordenskioeldii) in Laboratory Experiments
Hyun, Bonggil ; Choi, Keun-Hyung ; Jang, Pung-Guk ; Jang, Min-Chul ; Lee, Woo-Jin ; Moon, Chang-Ho ; Shin, Kyoungsoon ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1003~1012
DOI : 10.5322/JESI.2014.23.6.1003
We examined the combined impacts of future increases of
and temperature on the growth of four marine diatoms (Skeletonema costatum, Chaetoceros debilis, Chaetoceros didymus, Thalassiosira nordenskioeldii). The four strains were incubated under four different conditions: present (
: 400ppm, temperature:
), acidification (
: 1000ppm, temperature:
), global warming (
: 400ppm, temperature:
), and greenhouse (
: 1000ppm, temperature:
) conditions. Under the condition of higher temperatures, growth of S. costatum was suppressed, while C. debilis showed enhanced growth. Both C. didymus and T. nodenskioldii showed similar growth rates under current and elevated temperature. None of the four species appeared affected in their cell growth by elevated
concentrations. Chetoceros spp. showed increase of pH per unit fluorescence under elevated
concentrations, but no difference in pH from that under current conditions was observed for either S. costatum or T. nodenskioeldii, implying that Chetoceros spp. can take up more
per cell than the other two diatoms. Our results of cell growth and pH change per unit fluorescence suggest that both C. debilis and C. didymus are better adapted to future oceanic conditions of rising water temperature and
than are S. costatum and T. nodenskioeldii.
The Research on Lighting Design of Parks
Zhang, Rui ; Piao, Yong-Ji ; Cao, Lin-Sen ; Cho, Tae-Dong ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1013~1020
DOI : 10.5322/JESI.2014.23.6.1013
Based on the survey of the parks in Tai'an by questionnaire survey, on-the-spot investigation and in-depth interview, the paper analyzes the tendencies of visitors in modern landscape lighting design forms and methods from two terms: primary attributes and the preferences of artistic lighting design. To increase the safety of the parks is a pressing need for visitors. Visitors have a pressing need for increasing the safety of the parks' lighting and artistic quality. Most visitors think the parks' lighting has blind spots and the brightness is not enough. Visitors' night activities in the park will be insecure. As to artistry aspects, people prefer strong artistic style of lamps and lanterns to the common, such as ethnic style and animal image; Tourists prefer to use white light and yellow light to illuminate trees, because these colors make people feel more warm and amiable. This research provides basic data for lighting design of parks.
Effects of Haw (Crataegus pinnatifida B
) on Relaxation in the Lipid Components and Blood Glucose of Lipid Metabolism Syndrome
Kim, Han-Soo ; Kim, Min-A ; Duan, Yishan ; Jang, Seong-Ho ; Lee, Won-Ki ; Ryu, Jae-Young ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1021~1027
DOI : 10.5322/JESI.2014.23.6.1021
This study was designed in order to determine the influences of haw (Crataegus pinnatifida
) on the lipid metabolism syndrome. Sprague Dawley rats, 7 weeks old, were given four different types of diets for 5 weeks: ND group (noncholesterolemic diet), HE group (non cholesterolemic diet+haw extract), CD group (cholesterolemic diet), CH group (cholesterolemic diet+haw extract). Concentrations of LDL-cholesterol, triglyceride, phospholipid, free cholesterol, cholesteryl ester, blood glucose were remarkably higher in the CD group than the other groups. But by treatment of haw extract group with cholesterolemic diet (CH group) were significantly decreased compared with CD group. Cholesteryl ester ratio was no difference between CD group and CH group. These results indicate that Crataegus pinnatifida
would be effective in lipid metabolism syndrome.
Influences of Wild Haw (Crataegus pinnatifida B
) on Lowering BUN and Creatinine Concentrations in Dyslipidemia
Kim, Han-Soo ; Kim, Min-A ; Duan, Yishan ; Jang, Seong-Ho ; Cho, Han-Jin ; Ryu, Jae-Young ; Kim, Sang-Woo ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1029~1035
DOI : 10.5322/JESI.2014.23.6.1029
This study was investigate the influences of wild haw (Crataegus pinnatifida
) on lowering blood urea nitrogen (BUN) and creatinine concentrations in dyslipidemic rats. Four groups of rats were fed different diets for 5 weeks: basal diet (BD group), nondyslipidemic diet+feral haw extract (NDF group), dyslipidemic diet (DLD group), dyslipidemic diet+feral haw extract (DFH group). BUN, creatinine and uric acid concentrations were significantly higher in the DLD group than in the BD group. However, DFH group significantly lowered BUN, creatinine and uric acid concentrations compared to the DLD group. Amylase activity was significantly lower in the DLD group than in the BD group, while DFH group significantly higher compared to the DLD group. Lipase activity was also also significantly lower in the DLD group than the other group. Accordingly, these results suggest that haw extract could be effective for improving kidney function in dyslipidemic rats.
Analysis of UV Filters in Water using Stir Bar Sorptive Extraction (SBSE) and GC/MS-MS
Seo, Chang-Dong ; Son, Hee-Jong ; Jung, Jong-Moon ; Choi, Jin-Taek ; Jang, Seong-Ho ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1037~1047
DOI : 10.5322/JESI.2014.23.6.1037
A highly sensitive analytical method based on stir bar sorptive extraction (SBSE) technique and gas chromatography/tandem mass spectrometry (GC/MS-MS) has been developed, allowing the simultaneous multi-analyte determination of seven UV filters in water samples. The stir bar coated with polydimethylsiloxane (PDMS) was added to 40 mL of water sample at pH 3 and stirred at 1,100 rpm for 120 min. Other SBSE parameters (salt effect and presence of organic solvent) were optimised. The method shows good linearity (coefficients > 0.990) and reproducibility (RSD < 12.9%). The extraction efficiencies were above 84% for all the compounds. The limits of detections (LOD) and limits of quantification (LOQ) were 2.1~8.6 ng/L and 6.8~27.5 ng/L, respectively. The developed method offers the ability to detect 8 UV filters at ultra-low concentration levels with only 40 mL of sample volume. Matrix effects in tap water, river water, wastewater treatment plant (WWTP) final effluent water and seawater were investigated and it was shown that the method is suitable for the analysis of trace level of 7 UV filters except of benzophenone (BP). The method developed in the present study has the advantage of being rapid, simple, high-sensitive and both user and environmentally friendly.
Variations of Dissolved Inorganic Nutrient Flux through the Seomjin River Estuary
Park, Mi-Ok ; Lee, Jae-Seong ; Kim, Seong-Soo ; Kim, Seong-Gil ; Lee, Suk-Mo ; Lee, Yong-Woo ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1049~1060
DOI : 10.5322/JESI.2014.23.6.1049
We investigated the spatiotemporal variations of dissolved inorganic nutrients along a saline gradient to estimate nutrient fluxes in the Seomjin River estuary during dry (March 2005, March 2006, March 2007, and March 2008) and rainy seasons (August 2005, July 2006, July 2007, and July 2008). Dissolved inorganic nitrogen concentrations were similar in the endmembers of freshwater for the rainy and dry seasons. In contrast, the concentrations of dissolved inorganic phosphate and silicate in the rainy season were approximately 2-3 times higher than those in the dry season. River discharge was approximately 10 times higher in the rainy season (
) than in the dry season (
). The fluxes of dissolved inorganic nitrogen, phosphate, and silicate were 2.91, 0.004, and 2.51 tons
in the dry season and 7.45, 0.421, and 30.5 tons
in the rainy season, respectively. Although the range of nutrient concentrations were similar to previous results from investigations in the Seomjin River estuary, the nutrient fluxes were differed according to river discharge for different survey periods.
The Improvement of Bio-gas Production through the Change of Sludge-Recycle Ratio with Two-Stage Anaerobic Digestion
Kwon, Kooho ; Lee, Taewoo ; Jung, Yongjun ; Min, Kyungsok ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1061~1066
DOI : 10.5322/JESI.2014.23.6.1061
This study has cross checked the change of internal sludge-recycle in Anaerobic-Digestion, and researched about not only the improvement of Bio-gas production from the digested sludge but also the efficient method of sludge minimization. Ultimate object of the study is to reduce the amount of sludge by the improved efficiency of contact with the organic-matter and the microbes in Anaerobic-Digestion. The sludge-recycle fluidized sludge layer and raised the activity of the sludge, the optimal sludge-recycle ratio, VS and COD removal ratio were 1,000%, 28.2% and 27.7%, respectively. Through these results of this study, it may be of use to treat waste sludge by the sludge-recycle ratio in terms of minimization and circulation of resources.
Environmental Impact Evaluation for Glass Bottle Recycle using Life Cycle Assessment
Baek, Seung-Hyuk ; Kim, Hyung-Jin ; Kwon, Young-Shik ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1067~1074
DOI : 10.5322/JESI.2014.23.6.1067
Life Cycle Assessment(LCA) has been carried out to evaluate the environmental impacts of glass bottle recycle. The LCA consists of four stages such as Goal and Scope Definition, Life Cycle Inventory(LCI) Analysis, Life Cycle Impact Assessment(LCIA), and Interpretation. The LCI analysis showed that the major input materials were water, materials, sand, and crude oil, whereas the major output ones were wastewater,
, and non-hazardous wastes. The LCIA was conducted for the six impact categories including 'Abiotic Resource Depletion', 'Acidification', 'Eutrophication', 'Global Warming', 'Ozone Depletion', and 'Photochemical Oxidant Creation'. As for Abiotic Resource Depletion, Acidification, and Photochemical Oxidant Creation, Bunker fuel oil C and LNG were major effects. As for Eutrophication, electricity and Bunker fuel oil C were major effects. As for Global Warming, electricity and LNG were major effects. As for Ozone Depletion, plate glasses were major effects. Among the six categories, the biggest impact potential was found to be Global Warming as 97% of total, but the rest could be negligible.
Growth Characteristics of Trees following Different Types of Cutting in Quercus acutissima Stand
Shin, Yu-Seung ; Song, Sun-Hwa ; Yang, A-Ram ; Hwang, Jaehong ; Park, Yong Mok ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1075~1083
DOI : 10.5322/JESI.2014.23.6.1075
The objective of this study was to evaluate the effect of cutting types on microclimate and growth characteristics of afforested tree in Quercus acutissima stand after different types of cutting. The difference in temperature reaching
was shown in between clear cutting and selective cutting treatments. On July and August days with temperatures more than
often appeared in clear cutting stand. The values of VPD in July and August were higher than those in other months. Maximum VPD of 3.99 kPa was shown in clear cutting stand on May 23 as a prolonged rainless days appeared. However, VPD in selective cutting stand always stayed under 3.0 kPa throughout growing season. A higher intensity was shown in clear cutting and strip clear cutting stands, reaching to more than
at midday on early August, while that in selective cutting stand stayed about 1,500. In relative growth rate selective cutting stand showed a significantly higher relative growth rate in plant height than those in other cutting stands (p<0.05). The number of leaf in current-year branches significantly increased in selective cutting stand, whereas no increase was shown in clear cutting and strip clear cutting stands (p<0.05). In addition, relative elongation rate of current year branch also showed higher values in selective cutting stand compared with that in strip clear cutting stand (p<0.05). However, leaf mass per unit area (LMA) was higher in order of strip clear cutting, clear cutting, and selective cutting stands. From these results it is concluded that environmental conditions in clear cutting and strip clear cutting stands during growing season are more stressful to afforested tree species, resulting in lower relative growth in plant height, elongation of current-year branches, and leaf number per branch compared with those in selective cutting stand. Consequently, more data must be accumulated in the field to find out best cutting type in plantation considering the adaptational characteristic of each tree species varies with species and life span of tree is long.
A Study on the Applcation of Small Wind Power System using Meteorological Simulation Data in Pusan
Lee, KwiOk ; Lee, KangYeol ; Kang, Dongbae ; Park, Changhyoun ; Jung, Woo-Sik ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1085~1093
DOI : 10.5322/JESI.2014.23.6.1085
We investigate the amount of potential electricity energy generated by wind power in Busan metropolitan area, using the mesoscale meteorological model WRF (Weather Research & Forecasting), combined with small wind power generators. The WRF modeling has successfully simulated meteorological characteristics over the urban areas, and showed statistical significant to predict the amount of wind energy generation. The highest amount of wind power energy has been predicted at the coastal area, followed by at riverbank and upland, depending on predicted spatial distributions of wind speed. The electricity energy prediction method in this study is expected to be used for plans of wind farm constructions or the power supplies.
Characteristics of Bacteria-Originated Keratinase for Feather Waste Treatment
Go, Tae-Hun ; Lee, Sang-Mee ; Cho, Kwang-Sik ; Lee, Ye-Ram ; Park, Soo-Yun ; Jang, Eun-Young ; Jeong, Seong-Yun ; Son, Hong-Joo ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1095~1100
DOI : 10.5322/JESI.2014.23.6.1095
Keratin wastes are generated in excess of million tons per year worldwide and biodegradation of keratin by microorganisms possessing keratinase activity can be used as an alternative tool to prevent environmental pollution. For practical use of keratinase, its physicochemical properties should be investigated in detail. In this study, we investigated characteristics of keratinase produced by Xanthomonas sp. P5 which is isolated from rhizospheric soil of soybean. The level of keratinase produced by the strain P5 increased with time and reached its maximum (10.6 U/ml) at 3 days. The production of soluble protein had the same tendency as the production of keratinase. Optimal temperature and pH of keratinase were
and pH 9, respectively. The enzyme showed broad temperature and pH stabilities. Thermostability profile showed that the enzyme retained 94.6%-100% of the original activity after 1 h treatment at
. After treatment for 1 h at pH 6-10, 89.2%-100% of the activity was remained. At pH 11, 71.6% of the original activity was retained after 1 h treatment. Although the strain P5 did not degrade human hair, it degraded duck feather and chicken feather. These results indicate that keratinase from Xanthomonas sp. P5 could be not only used to upgrade the nutritional value of feather hydrolysate but also useful in situ biodegradation of feather.
Evaluation of Biomass of Biofilm and Biodegradation of Dissolved Organic Matter according to Changes of Operation Times and Bed Depths in BAC Process
Son, Hyeng-Sik ; Jung, Chul-Woo ; Choi, Young-Ik ; Lee, Gun ; Son, Hee-Jong ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1101~1109
DOI : 10.5322/JESI.2014.23.6.1101
In this study we followed biofilm formation and development in a granular activated carbon (GAC) filter on pilot-scale during the 12 months of operation. GAC particles and water samples were sampled from four different depths (-5, -25, -50 and -90 cm from surface of GAC bed) and attached biomass were measured with adenosine tri-phosphate (ATP) analysis and heterotrophic plate count (HPC) method. The attached biomass accumulated rapidly on the GAC particles of top layer throughout all levels in the filter during the 160 days (BV 23,000) of operation and maintained a steady-state afterward. During steady-state, biomass (ATP and HPC) concentrations of top layer in the BAC filer were
, and 85%, 83% and 99% of the influent total biodegradable dissolved organic carbon (
were removed, respectively. During steady-state process, biomass (ATP and HPC) concentrations of middle layer (-50 cm) and bottom layer (-90 cm) in the BAC filter were increased consistently. Biofilm development (growth rate) proceed highest rate in the top layer of filter (
) and 78%~87% slower in the bottom layer (
). This study shows that the combination of different analytical methods allows detailed quantification of the microbiological activity in drinking water biofilter.
Outcomes and Evaluations of Ulsan Eco-city Model
Lee, Sang-Hyeon ; Suh, Jung-Ho ; Cho, Hong-Je ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1111~1120
DOI : 10.5322/JESI.2014.23.6.1111
Ulsan made its contributions to modern Korea as an industrial city. In the 1960s, Ulsan was appointed as a special industrial zone. After that, industrial complexes were built without environmental considerations so Ulsan was once called "the polluted city". However, in the early 2000s, the main concern of Ulsan's policies was gradually shifted from the economic growth to the environmental issues. In order to enhance the environmental quality and to make the Ulsan more environmentally friendly eco-city where human and nature coexist, Ulsan city declared "The Eco-polis Ulsan" in 2004 based on "The Master Plan for Eco-polis Ulsan" which included the eco-industrial park as an action plan. This study aims at defining the concepts of eco-city and policies to build Ulsan-style eco-city as environmentally friendly city and proposing Ulsan as a role model to cities and towns of developing countries. In addition, Ulsan's EIP project which will be implemented for 15 years from 2005, is elaborated including regulatory issues and technologies to be applied.
Analysis of Utilization and Perception of Special Weather Reports for Climate Change Adaptation: Focus on Dryness Advisory and Warning
Choi, Su-Jin ; Kim, Eun-Byul ; Jung, Woo-Sik ; Kim, Baek-Jo ; Park, Jong-Kil ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1121~1130
DOI : 10.5322/JESI.2014.23.6.1121
This study aims to find the perception and utilization of the citizen about the dryness watch warning (DWW) among special weather reports. For this we have made up a descriptive questionnaire including the perception, utilization of special weather reports. Using the SPSS 17.0 program, descriptive statistics, t-test, ANOVA and Scheffe test were used to analyze the collected data. The results are as follows; The perception of DWW is measured by 4 point Likert scale and the average is
(percentile=57.0). This value shows that the awareness level is not that high and according to the occupation, college students show the lowest awareness and housewives show the highest awareness. According to the age, the teens and twenties show the lowest awareness and fifties and sixties show the highest awareness. Although the perception of the teens and college students are rather poor, there were many positive answers that it is necessary to establish the advanced disaster prevention plan according to the questionnaire about the utilization of DWW. Therefore, if we come up with an effective plan to improve the perception than we can expect a large-effect in terms of fire and forest fire prevention. The perception of DWW can be improved by providing weather information and weather related education program on TV or internet which have the high level of preference. Also, it is necessary to provide online and offline program of advertising education and disaster management education through the weather forecast bureau which is the host organization of delivering weather information.
Response of Soil CO
Fluxes to Seasonal Variations in a Grassplot
Kim, Park Sa ; Kwon, Byung Hyuk ; Kang, Dong Hwan ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1131~1142
DOI : 10.5322/JESI.2014.23.6.1131
In this study, the variations of the carbon dioxide fluxes were investigated with soil temperatures in the grassplot and seasonal variations of carbon dioxide concentrations and fluxes were analysed. Soil temperatures, carbon dioxide concentrations and fluxes were measured on the grassplot in Pukyong National University. Field measurements were carried out 25 times from March in 2010 to March in 2011 with nine points on the grassplot. Seasonal variations of carbon dioxide concentrations and fluxes showed an inverse relation. In summer, carbon dioxide concentrations are lower and carbon dioxide fluxes are higher. In winter, carbon dioxide concentrations are higher and carbon dioxide fluxes are lower. On the grassplot, carbon dioxide emission rate increase when the soil temperature is more than
and the emission rate decrease when the soil temperatures are less than
. When the accumulated rainfall for five days before measurement day is 20~100 mm, it is showed that the more rainfall, the more carbon dioxide emissions. Carbon dioxide emission rate from the grassplot to the upper atmosphere was increased or decreased by the factors such as soil temperature, growth and wither of grass and rainfall. The results of this study showed that the emission of carbon dioxide in the grassplot is dominantly controlled by seasonal factors (especially soil temperature and rainfall).
Breakthrough Characteristics for Lithium Ions Adsorption in Fixed-bed Column Packed with Activated Carbon by Modified with Nitric Acid
Kam, Sang-Kyu ; You, Hae-Na ; Lee, Min-Gyu ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1143~1149
DOI : 10.5322/JESI.2014.23.6.1143
The adsorption experiments of lithium ions were conducted in the fixed bed column packed with activated carbon modified with nitric acid. Effect of inlet concentration, bed hight and flow rate on the removal of lithium ions was investigated. The experimental results showed that the removal and the adsorption capacity of lithium ions increased with increasing inlet concentration, and decreased with increasing flow rate. When the bed height increased, the removal and the adsorption capacity increased. The breakthrough curves gave a good fit to Bohart-Adams model. Adsorption capacity and breakthrough time calculated from Bohart-Adams model, these results were remarkably consistent with the experimental values. The adsorption capacity was not changed in the case of 3 times repetitive use of adsorbent.
Effect of Methyl Ethyl Ketone and Ethyl Acetate Vapor on Photocatalytic Decomposition of n-Pentane Vapor
Kam, Sang-Kyu ; Jeon, Jin-Woo ; Lee, Min-Gyu ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1151~1156
DOI : 10.5322/JESI.2014.23.6.1151
The photocatalytic decomposition characteristics of single n-pentane, n-pentane mixed with methyl ethyl ketone (MEK), and n-pentane mixed with ethyl acetate (EA) by cylindrical UV reactor installed with
-coated perforated plane were studied. The effects of the residence time, the inlet gas concentration, and the oxygen concentration were investigated. The removal efficiency of n-pentane was increased with increasing the residence time and the oxygen concentration, but decreased with increasing the inlet concentration of n-pentane. The photocatalytic decomposition rates of single n-pentane, n-pentane mixed with MEK, and n-pentane mixed with EA fitted well on Langmuir-Hinshelwood kinetics equation. The maximum elimination capacities of single n-pentane, n-pentane mixed with MEK, and n-pentane mixed with EA were obtained to be
, respectively. The presence of coexisting MEK and EA vapor had a negative effect on the photocatalytic decomposition of n-pentane and the negative effect of MEK was higher than that of EA.
Preparation of PVC-D2EHPA beads by Immobilization of D2EHPA on Polyvinyl Chloride as Solid Phase Extractant and Removal Characteristics of Cu(II)
Kam, Sang-Kyu ; You, Hae-Na ; Lee, Dong-Hwan ; Lee, Min-Gyu ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1157~1163
DOI : 10.5322/JESI.2014.23.6.1157
The solid phase extractant (PVC-D2EHPA bead) was prepared by immobilizing di-2-ethylhexyl-phosphoric acid (D2EHPA) with polyvinyl chloride (PVC). The prepared PVC-D2EHPA beads were characterized by using fourier transform infrared spectrometer (FTIR) and scanning electron microscopy (SEM). The removal experiments of Cu(II) by PVC-D2EHPA beads conducted batchwise. The removal kinetics of Cu(II) was found to follow the pseudo-second-order model. The equilibrium data fitted well with Langmuir isotherm model and the maximum removal capacity was 2.6 mg/g at
. The optimum pH region was in the range of 3.5 to 6. and the standard free energy (
) was between -4.67~-4.98 kJ/mol, indicating the spontaneous nature of Cu(II) removal by PVC-D2EHPA beads.
Inactivation of Ralstonia Solanacearum using Filtration-Plasma Process
Kim, Dong-Seog ; Park, Young-Seek ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1165~1173
DOI : 10.5322/JESI.2014.23.6.1165
For the field application of dielectric barrier discharge plasma reactor in nutrient solution culture, a filtration-DBD (dielectric barrier discharge) plasma reactor was investigated for the Ralstonia solanacearum which causes bacterial wilt in aquiculture. The filtration-DBD plasma reactor system of this study was consisted of filter, plasma reactor, reservoir. The DBD plasma reactor consisted of a quartz dielectric tube, discharge electrode (inner) and ground electrode (outer). The experimental results showed that the inactivation of R. solanacearum with filter media type in filter reactor ranked in the following order: anthracite > fiber ball > sand > ceramic ball > quartz ceramic. In filtration + plasma process, disinfection effect with the voltage was found to small. In disinfection time of 120 minutes, residual R. solanacearum concentration was 1.17 log (15 CFU/mL). When the continuous disinfection time was 120 minute, disinfection effect was thought to keep the four days. In sporadic operation mode of 30 minutes disinfection - 24 hours break, residual R. solanacearum concentration after five days was 0.3 log (2 CFU/mL). It is considered that most of R. solanacearum has been inactivated substantially.
Effect of Cathode in Electrochemical Reaction for Treating Ballast Water
Kim, Dong Seog ; Park, Hye Jin ; Yoon, Jong Mun ; Park, Yong Seok ; Park, Young Seek ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1175~1182
DOI : 10.5322/JESI.2014.23.6.1175
In this study, we examined the effect of cathode from electrolysis reactor for treating ballast water. We are going to select a suitable cathode for seawater electrolysis after considering the effect on the generation of the oxidant of cathode and the electrode deposition materials adhering to the surface of cathode. Anode is Ru-Ti-Pd electrode and cathode are Ti, Pt, JP520 (Ni-Pt-Ce) electrodes. Using the cathode of the three types, experiments were conducted to examine the effects of TRO (total residual oxidants) generation concentration and RNO (N, N-Dimethyl-4-nitrosoaniline, indicator of the generation of OH radical) degradation concentration (in 1, 35 psu), ohmic drop, FESEM(field emission scanning electron microscope) observation of cathode surface and EDX (energy dispersive X-ray spectroscopy) measurements of attached fouling material. The results showed that TRO generation concentration and RNO degradation concentration in according to each type of cathode are not different. The attached fouling materials were observed on the surface of Ti and the JP520 electrode by the observation of SEM after electrolysis for two hours, but it was not observed on the surface of Pt electrode. When considering the surface ohmic drop of cathode and the attached fouling materials, Pt electrode was judged as the excellent cathode.
Size and Species Composition of Phytoplankton Related to Anthropogenic Environmental Changes in Doam Bay
Yang, Eeng-Ryul ; Jeong, Byung-Kwan ; Lee, Eo-Jin ; Ryu, Dong-Ki ; Shin, Yong-Sik ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1183~1197
DOI : 10.5322/JESI.2014.23.6.1183
Doam Bay is an estuary where harmful algal blooms (HABs) such as red tides develop frequently in summer. The bay also is influenced by freshwater inflow from Tamjin River in upper regions as well as from an artificial lake in lower regions. Phytoplankton size and species composition were investigated at six stations located in the lower regions in April, June and July, 2007. Physical properties (temperature, salinity and SS) were intensively measured for 3 days (5 occasions) after the freshwater discharges from the dike. The freshwater discharge affected temperature, salinity and turbidity in the study sites adjacent to the freshwater lake. Phytoplankton biomass was larger in April than June and it increased more in July. An explicit shift of species composition was observed. Diatoms were dominant in April and June (>70%) whereas their abundances greatly decreased and chlorophytes increased in July. Pseudo-nitzschia sp. was dominant at all stations (except St. 2) and this change was also detected in ecological indices such as diversity and dominance index.
Estimation of Atmospheric Turbulent Fluxes by the Bulk Transfer Method over Various Surface
Kim, Min-Seong ; Kwon, Byung-Hyuk ; Kang, Dong-Hwan ;
Journal of Environmental Science International, volume 23, issue 6, 2014, Pages 1199~1211
DOI : 10.5322/JESI.2014.23.6.1199
The momentum flux and the sensible heat flux were measured with the scintillometers and ultrasonic anemometers at 6 sites of which surface characteristics like roughness length and zero-displacement are different each other. We estimated the momentum flux and the sensible heat flux based on the bulk transfer method with the drag coefficient and the heat transfer coefficient calculated from the temperature and wind speed at two heights. The variation of bulk transfer coefficients showed a remarkable difference depending on the atmospheric stability which is less influenced by the zero-displacement than the roughness length. The estimated sensible heat fluxes were in good agreement with those measured at 3 m, showing 23.7
of the root mean square error that is less than 10% of its maximum. Since the estimated momentum flux is not only effected by drag coefficient but also by wind speed square, the determination of wind speed in the bulk transfer method is critical.