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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Environmental Engineers
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Journal DOI :
Korean Society of Environmental Engineering
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Volume & Issues
Volume 28, Issue 12 - Dec 2006
Volume 28, Issue 11 - Nov 2006
Volume 28, Issue 10 - Oct 2006
Volume 28, Issue 9 - Sep 2006
Volume 28, Issue 8 - Aug 2006
Volume 28, Issue 7 - Jul 2006
Volume 28, Issue 6 - Jun 2006
Volume 28, Issue 5 - May 2006
Volume 28, Issue 4 - Apr 2006
Volume 28, Issue 3 - Mar 2006
Volume 28, Issue 2 - Feb 2006
Volume 28, Issue 1 - Jan 2006
Selecting the target year
Phosphate Adsorption Characteristics of Zirconium Mesostructure Synthesized under Different Conditions
Lee, Seung-Hak ; Lee, Kwan-Yong ; Lee, Sang-Hyup ; Choi, Yong-Su ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 583~587
In this study, the phosphate adsorption characteristics of zirconium mesostructures synthesized under different conditions were estimated. X-ray diffraction analysis, phosphate adsorption isotherm test and kinetic test was performed for the zirconium mesostructures synthesized at different inorganic/surfactant molar ratio and with different surfactant templates. The test results were analyzed with adsorption models. From this work, it was found that at the inorganic/surfactant molar ratio of 1/0.50(
), the meso-pores in the material could be most uniformly and clearly formed and thus the adsorption capacity and reaction rate of material could be maximized. And the pore size in the mesostructure increased with the chain length of surfactant template used, and maximum phosphate adsorption amount and reaction rate could be achieved with the zirconium mesostructure synthesized with the surfactant template of dodecyltrimethylammonium bromide.
Concentration in Seoul Subway Stations
Jeon, Jae-Sik ; Kim, Dok-Chan ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 588~595
) concentrations of subway stations in Seoul area were measured to survey the environmental indoor radon levels and to identify sources of radon. The radon concentration of indoor air by method of long-term measuring with a-track detector were surveyed at 232 subway stations from 1998 to 2004. And the radon concentration in ground-water was measured with a method of alpha particle counting. To trace main source of radon, 8 out of 232 stations were selected and their radon concentrations in tunnel and on platform were analyzed. Total geometric mean and arithmetic mean of radon concentrations in all stations from 1998 to 2004 were
respectively. Geometric means of radon concentrations on platform and concourse were
respectively, with higher concentration at the platform than at the concourse. The geological structure was significantly correlated to the indoor radon concentration in subway stations region. Radon concentrations of adjacent tunnel and ground-water of subway station was significantly correlated to the indoor radon concentration in subway stations. And There was a significant difference in radon concentration, depending on the depth levels in platform of subway stations(p<0.05).
A Comparision Study of LDPE Pyrolysis over Resin Additives and Inorganic Compounds of Silica Alumina Type
Bak, Young-Cheol ; Choi, Joo-Hong ; Kim, Nam-Kyung ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 596~602
The effects of resin additives and inorganic compounds addition on the thermal decomposition of low density polyethylene(LDPE) resin have been studied in a thermal analyzer(TGA, DSC) and a small batch reactor. The silica-alumina type compounds tested were kaolinite, bentonite, perlite, diatomaceous earth, activated clay and clay. The resin additives were antiforgging-agent and longevity-agent. As the results of TGA experiments, addition of antifogging-agent, longevity-agent and clay increased the temperature of the maximum reaction rate(
). The silica-alumina type inorganic materials increased the pyrolysis reraction rate in the order of activated clay, diatomaceous earth, bentonite, perlites, and kaolinite. In the DSC experiments, addition of antifogging-agent and clay decreased the heat of fusion and the heat of pyrolysis reaction. Bentonite decreased 20% of the heat of fusion and 25% of the heat of pyrolysis reaction. In the batch system experiments, the mixing of clay retarded the initial producing rate of fuel oil, but increased the yield of fuel oil. Addition of bentonite increased the yield of fuel oil from LDPE resin. Mixing of antifogging-agent and longevity-agent produced the fuel oil having lower carbon number. The amounts of the carbon number below 12 in fuel oil decreased with adding the clay. That below 23 in fuel oil increased with mixing of bentonite, perlite, kaolinite, and activated clay. But the mixing of diatomaceous earth did not affect the carbon contents of fuel oil from pure LDPE resin. In the silica-alumina type inorganic material used in this experiments, bentonite was the most effective from the pyrolysis heat, yields, and the characteristics of fuel oil.
Assessment on Saline Water Intrusion between Types of Injections of Artificial Reclaimed Water and Extractions in Artificial Aquifer
Kang, Jeong-Ok ; Lee, So-Jung ; Kim, Chang-Gyun ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 603~612
The study with laboratory sandbox model has been carried out to address potential use of reclaimed water, as a way for artificially recharging the coastal aquifer, to effectively prevent from seawater intrusion. To do this, we assessed hydraulic and geochemical properties depending upon various extraction and recharging conditions. While solely being recharged, the intrusion could be significantly retarded than those of recharge and extraction implied together. At 0.5 to 2 for the ratio of the extraction over the recharge rate, the fresh water was exploited from the tank, where the void regime was simultaneously saturated with the recharged water. In the meantime, the saline water zone was diluted and back-tracked by the recharged water due to forming a hydraulic geochemical barrier around the injection well. However, if the ratio was being increased to greater than 4, saltwater more deeply intruded to the freshwater zone because the artificial recharge was not sufficiently supplied to timely back-fill the void space. When the aquifer water was intermittently extracted at the ratio of
over the recharge rate, the value of S.M.I. decreased, but increasing it to more than 4 unlikely escalated the value of S.M.I as much as
indicating that the salt water intruded. It finally revealed that the proper ratio of extraction/recharge or intermittent extraction would efficiently retracted seawater intrusion while the freshwater sources could be conservatively utilized.
Effect of Pretreatment Process on Hybrid Membrane Filtration Performance
Jung, Chul-Woo ; Son, Hee-Jong ; Bae, Sang-Dae ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 613~619
The objectives of this research are to evaluate the effect of membrane materials, particulate matter and membrane pore size on permeate flux. It was shown that the removal efficiency of high MW organic matter more than 10 kDa was lower than that of low MW organic matter for
process. For the change of permeate flux by the pretreatment process,
process showed high removal efficiency of organic matter as compared with coagulation+UF processes, but high reduction rate of permeate flux was presented through the reduction of removal efficiency of high MW organic matter. The pretreatment of the raw water significantly reduced the fouling of the hydrophilic membrane, but did not decrease the flux reduction of the hydrophobic membrane. Flux decline on MF process increased due to the pore clogging, while the permeate flux decline of UF process decreased due to the formation of cake layer. It was shown that particle matter was not effect on MIEX+membrane process. But, for coagulation+membrane process, particle matter was important factor on permeate flux.
Determination of Arsenic in Water by ICP-DRC/MS
Jeong, Gwan-Jo ; Kim, Dok-Chan ; Park, Hyeon ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 620~625
In this investigation, an ICP-DRC/MS method to measure arsenic with ultra-trace concentration without any interference by the compounds such as
, which disturb the precise measurement of arsonic was described. Thus, the oxgen was introduced into the dynamic reaction cell as reaction gas and reacted with arsenic ion created in plasma gas,
was formed and detected with m/z of 91 by ICP-MS. It resulted in better detection limit than the old method with m/z of 75(
). The optimum condition for oxygen supply as the reaction gas was 0.5 mL/min. The analytical features of the method are as follows: detection limit of
, precision(RSD) of 3.4%, and recovery of 96%. Arsenic in the water samples from the tributary streams to the Han River and the main stream of Paldang were analyzed with this method to identify the characteristics in its distribution. The concentration of As ranged from 0.53 to
. We could measure As with very low concentration, less than
, with excellent reproducibility. The method developed is expected to be applied to analyze As of the samples from sea water, food, and domestic and industrial waste water which have high concentration of Cl and/or Ca.
A Study on the Hydraulic Properties of Aquifers in Bucheon Area
Kim, So-Hee ; Lee, Yoon-Jin ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 626~633
Bucheon city has been rapidly urbanized and steadily enlarged. Also, the city depends on groundwater as an alternative water resource. The objective of this study is to characterize the hydrogeology in this city including the recharge of groundwater and hydraulic property of an aquifer in order to investigate the chemical characteristics and contamination of groundwater in the Bucheon area. Eleven groundwater wells in the Bucheon area were selected for applying certain hydraulic tests, such as pumping and recovery tests. Theis method and Theis recovery method were used to obtain hydraulic parameters, such as hydraulic conductivity, transmissivity by applying recovery tests. The playground of school and uncovered areas layed a major function of recharging areas. The groundwater well in these areas showed high recharge, transmissivity, and hydraulic conductivity. In a downtown area, groundwaier wells showed low pumping capacity and hydraulic parameters. Groundwater samples were collected from 48 different locations in the Bucheon area and that showed very various chemical composition in groundwater Their electrical conductivity showed various ranges from 70.4 to
. The composition more significantly affected the groundwater due to the land use and urbanization than that of the aquifer rock type.
Electric Field Simulation and Removal Characteristics of Escherichia coli for Discharge Tube with
Lee, Tae-Gwan ; Lee, Dong-Hoon ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 634~639
The simulation of electric field distribution of discharge tube with globular
and the removal characteristic of Escherichia coli by the discharge tube with globular
were estimated. The removal characteristic of Escherichia coli was related to the input voltage because the electric field is increased according to input voltage. As the passing amount of test water in discharge tube is increased, the removal ratio of Escherichia coli was increased because passing numbers of electric field section is increased. As the particle size of globular
increased, the removal time of Escherichia coli was shortened due to the dielectric polarization of globular dielectric
. Also, the removal efficiency of Escherichia coli for the discharge tube with globular dielectric
was higher than that of the discharge tube without it.
Comparative Study on Recovery of Nickel by Ion Exchange and Electrodialysis
Sim, Joo-Hyun ; Seo, Hyung-Joon ; Seo, Jae-Hee ; Kim, Dae-Hwan ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 640~647
It is difficult to treat wastewater involved in heavy metal in electroplating industry. Recently, many industries adopt the clean technology to prevent production of pollutant in the process or reuse after the appropriate pollutant treatment. In this study, we estimate the ability of recovery of nickel and the efficiency using lab-scale ion exchange and electrodialysis process with electroplating industry wastewater. In the ion exchange experiments with 5 types of resin, the result showed that S 1467(gel-type strong acidic cation exchange resin) has the highest exchange capacity. And it showed that the 4 N HCl has the highest in regeneration efficiency and maximum concentration in the regeneration experiments with various kinds md concentration of the regenerant. During the electrodialysis experiments, we varied the current density, the concentration of electrode rinse solution, the flow rate of concentrate and electrode rinse solution in order to find the optimum operating condition. As a result, we obtained
of current density, 2 N
of concentration of electrode rinse solution, 30 mL/min of flow rate of concentrate and electrode rinse solution as the best operating conditions. We performed the scale-up experiments on the basis of ion exchange and electrodialysis experiments. And we obtained the experimental result that exchange capacity of S 1467 was 1.88 eq/L resin, and regeneration efficiency was 93.7% in the ion exchange scale-up experiment, we also got the result that concentration and dilution efficiency increased, and current efficiency kept constant in the scale-up experiments.
The Removal of Styrene using Immobilized Microorganisms in Hydrogel Beads
Song, Ji-Hyeon ; Ham, Eun-Yi ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 648~653
As an alternative for the traditional materials packed in biofilters treating gaseous VOCs, a novel packing material has been developed and tested. In the packing material(named as Hydrogel Bead, HB), pollutant-degrading microorganisms were immobilized in hydrogel consisted of alginate, polyvinyl alcohol(PVA), and powdered activated carbon. A closed-bottle study showed that the HB rapidly removed gaseous styrene without the losses of adsorption and biodegradation capacity. Biofilter column experiments using the HBs also demonstrated that greater than 95% of removal efficiencies were found at an inlet styrene loading rate of
, which was higher biofilter performance than other elimination capacity reported earlier. Furthermore, when the inlet styrene concentration increased stepwise, the adsorption played an important role in overall styrene removals. The absorbed styrene was found to be biodegraded in the following low inlet loading condition. Consequently, the new HB material is able to successfully minimize the drawbacks of activated carbon(necessity of regeneration) and biological processes(low removal capacity at dynamic loading conditions), and maximize the overall performance of biofilter systems treating VOCs.
Modeling of Discharge Characteristics of Combined Sewer Overflows(CSOs) from a Small Urban Watershed in Daejeon City
Kim, Jeong-Kon ; Ko, Ick-Hwan ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 654~660
This study investigated the discharge characteristics of combined sewer overflows(CSOs) at a small watershed located in the Ojeong-cheon area of the Daejeon-cheon, Daejeon City. The long-term variations of discharges, water quality, and SS loads from 2001 to 2004 were simulated using SWMM. The simulation results indicated that suspended solid(SS) loads during the rainy seasons(July
August) were highest throughout the whole year, but not substantially higher than those during the dry seasons. This result is due to the fact that contaminants do not buildup significantly because of frequent rainfall events during the wet seasons. It was estimated that about 9.3% of SS was discharged to the receiving body the during dry seasons while 90.7% during the rainy seasons. Further analysis showed that during the wet seasons SS loads discharged at the site as CSOs and at the wastewater treatment plant without treatment were 38% and 62%, respectively.
Influence of Water Glass on Strength of Fly Ash-Cements
Park, Sang-Sook ; Kang, Hwa-Young ; Han, Sang-Ho ; Rim, Yu-Sup ; Kim, Dong-Kuk ; Kim, Se-Hoon ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 661~666
The compressive strength of a paste composed of a low-calcium Class F fly ash and alkaline activator solutions was investigated. These activator solutions, made with sodium hydroxide, water glass and water, have a very high
concentration. The composition of alkaline activator solution and temperature have been shown to notably influence the development of the compressive strength of the fly ash-cements paste. Compressive strength of 50 MPa could be achieved by curing of the fly ash at
for 48 hrs or
for 24 hrs. This study presented the optimum mixing ratio of Class F fly ash/sodium hydroxide/water glass as 25:8:2 in weight basis, and activator/fly ash as 0.6/1.0 for high strength paste.
Variations on the Concentration of Dissolved Gaseous Mercury(DGM) at the Juam Reservoir, Korea
Park, Jong-Sung ; Oh, Se-Hee ; Shin, Mi-Yeon ; Yi, Seung-Muk ; Zoh, Kyung-Duk ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 667~676
The reduction of
in the aqueous phase results in the production of dissolved gaseous mercury(DGM), and the volatilization of DGM has been identified as an important mechanism for the loss of Hg from waterbodies to the atmosphere. Although mercury emission in the world is known to be mostly from Asia, there have been few studies of measuring DGM concentrations in lakes in Asia. In this study, DGM concentrations were measured at Juam reservoir(
), Korea. The results showed that the average concentrations of DGM at the upper and down stream of the lake during summer time were
pg/L, respectively and the concentration of total mercury(TM) at the upper and down stream was
ng/L respectively. Average DGM concentration during summer time(
) was approximately 5.5 times higher than that during fall(
). The DGM concentrations ai the midstream decreased from 32 to 13.7 pg/L during rain event, while the TM concentrations increased from 2.2 ng/L to 2.7 ng/L indicating the deposition of mercury from the atmosphere. Also, the diurnal patterns between DGM concentrations and UV intensities were observed. Water temperatures and DOC concentrations were significantly related to DGM concentrations, while TM concentrations were negatively related to DGM concentrations(p<0.0001). Comparing with the study of Dill et al.,(2006) the average concentrations of DGM
at Juam reservoir were approximately 3 and 2.2 times higher than those measured in other lakes(DGM:
Evaluation of Biological Aerated Filter Position on Water Treatment Processes for Water Quality Improvement
Choi, Hyung-Joo ; Choi, Dong-Ho ; Bae, Woo-Keun ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 677~686
This study was the effectiveness of two downflow BAF(Biological Aerated Filter) systems at conventional water treatment system. A BAF reactor placed in front of coagulation and sedimentation tanks(Mode A) and after coagulation and sedimentation tanks(Mode B) that were compared in terms of removal of suspended particles, organic matters, and ammonia nitrogen. The suspended particles removal efficiency was over 80% for both Mode A and B, although Mode A gave slightly better results.
removal and nitrification efficiencies were more than 90% for both reactor. The organic matter and ammonia removals were also superior in the Mode A. The biofilm thickness and biomass increased as increment of EBCT and the upper part of reactor more about 30% than lower part. The specific oxygen uptake rate(SOUR) was higher the upper part of reactor and Mode A than the lower part of reactor and Mode B. A cost analysis showed that the Mode A system was more cost effectiveness. It could save the coagulant dose by about 67% and the chlorine demand by about 95%. The ideal place to put the BAF reactor was in front of the coagulation/sedimentation process.
Characteristics of Biological Nitrogen Removal for Low C/N Ratio Municipal Wastewater Using Methanol as an External Carbon Source in
Fluidized Media Process
Yoon, Cho-Hee ; Kim, Min-Soo ; Kim, Seung-Hyun ;
Journal of Korean Society of Environmental Engineers, volume 28, issue 6, 2006, Pages 687~692
This experiment was performed to evaluate the characteristics of BNR system performance, behavior of pollutants as organic and nitrogen at each basin and the effects of C/N ratio on biological nitrogen removal with methanol as an external carbon source for a low C/N ratio municipal wastewater. A lab-scale
system by employing the aerobic basin with the fluidized polyurethane media, which was
mm rube type like a sponge, was used. The aerobic basin was hybrid type to be suspended and fixed biomass. The obtained results from this study were as follows; When no methanol was added, suspended biomass was 3 times more than that of the fluidized media in this system(total biomass 80 g). Biomass growed by an external carbon was firstly attached on media, and then suspended.
concentration for the effluent was a range of 13 to 29 mg/L regardless of pouring an external carbon. For nitrogen, the effluent concentration was
(removal efficiency; 18%) in case of no addition of an external carbon, but was
(removal efficiency ;
) with addition of methanol. For the characteristics of pollutants removal, most of
were removed at the anaerobic basin when no external organic carbon was added, and were removed at the anoxic basin in case of adding external organic carbon but at the aerobic basin in case of adding excess external organic carbon. On the other hand, most TIN(total inorganic nitrogen) were removed at the anaerobic basin when no external organic carbon was added, but when an external organic carbon was added, they were removed at the anaerobic basin under unstable condition and at the anoxic basin under stable condition.