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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 34, Issue 12 - Dec 2012
Volume 34, Issue 11 - Nov 2012
Volume 34, Issue 10 - Oct 2012
Volume 34, Issue 9 - Sep 2012
Volume 34, Issue 8 - Aug 2012
Volume 34, Issue 7 - Jul 2012
Volume 34, Issue 6 - Jun 2012
Volume 34, Issue 5 - May 2012
Volume 34, Issue 4 - Apr 2012
Volume 34, Issue 3 - Mar 2012
Volume 34, Issue 2 - Feb 2012
Volume 34, Issue 1 - Jan 2012
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Characteristics of Particle Separation in Water Using Lab-Scale Acoustic Standing Wave
Ahn, Jaehwan ; Kang, Sungwon ; Ahn, Kwangho ; Kim, I tae ; Kim, Seog gu ; Ahn, Hosang ; Lee, Youngsup ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 787~791
DOI : 10.4491/KSEE.2012.34.12.787
Characteristics of particle separation in water using labscale acoustic standing wave were studied. Acoustic standing wave is similar to either sound wave or ultrasonic, which makes a constant wave while returning to the origin by reflector. During that time, particulates dispersed in water are collected on the node of wave, where a sound pressure is zero. Acoustic standing wave transducer as of 28.0 kHz and 1.0 MHz were utilized and
redmud in average diameter were used as experimental materials in water. Once acoustic standing wave are generated in water, water temperature rises by
due to a sound pressure. Initial concentration of kaolin and redmud were controlled to have same as of 0.1, 0.2, 0.3, 0.4, 0.5 g/L, respectively. Removal efficiency of the turbidity in a reacting chamber after 5 minutes, when acoustic sound wave was formed in most distinct, was measured to have 18.2~56.2% for kaolin and 23.0~53.6% for redmud at 1.0 MHz. Particle separation was not observed at 28.0 kHz.
Analysis of Suspended Solids Reduction by Vegetative Filter Strip for Cultivated Area Using Web GIS-Based VFSMOD
Ahn, Jae Hwan ; Yun, Sang Leen ; Kim, Seog Ku ; Park, Youn Shik ; Lim, Kyoung Jae ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 792~800
DOI : 10.4491/KSEE.2012.34.12.792
The study was performed to simulate the reduction efficiency of suspended solids (SS) for cultivated land located at riverine area at the Namhan River and the Bukhan River watershed sites (site A, B, C) under the rainfall conditions using HUFF & SCS UH-based VFS Design module of Web GIS-based VFSMOD System. The study indicates that the field 5% sloped, located at Bukhan River watershed (site A), requires at least 0.5 m width of Vegetative Filter Strip (VFS) to reduce 70% of SS while the field 10% sloped requires the at least 1.0~1.5 m width of VFS to reduce 70% SS, under the condition 106.2 mm of rainfall event and bell pepper or corn of crops. Against the conditions 95.1 mm of rainfall event and sweet potato or soy bean of crops, the field 5% sloped, located at Namhan River watershed (site B) requires at least 0.5 m width of VFS to reduce 70% of SS while the field 10% sloped requires at least 1.0 m width of VFS to reduce 50% SS. The crops sweet potato and soy bean are cultivated in the site C, located at Namhan River watershed, 1 m of VFS is capable of 64.0% and 62.0% of SS reduction against 102.6 mm and 151.2 mm rainfall conditions respectively, for the 5% sloped field. The result supports that VFS is one of most potential methods to reduce SS from cultivated area, which is environment-friendly hydrologic structure. The VFS design, however, needs to be simulated before its installation in the field, the simulation needs to consider not only various characteristics of the field but also different conditions affecting the VFS, using a model capable to consider a lot of factors.
Characteristics of Gaseous Dissolved Mercury and Total Mercury in Yangsuri Marsh of Korea
Yang, Ji-Hye ; Han, Young-Ji ; Kim, Pyung-Rae ; Park, Sang-Young ; Seo, Yong-Seok ; Lee, Jong-Hwan ; Kim, Moon-Kyung ; Yi, Seung-Muk ; Cho, Kyung-Deok ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 801~809
DOI : 10.4491/KSEE.2012.34.12.801
Long-term measurement of total mercury (TM) and dissolved gaseous mercury (DGM) were performed in Yangsuri marsh. Average TM and DGM concentrations were
pg/L, respectively, indicating that only 2.6% of TM existed as the form of DGM in Yangsuri marsh. While TM did not show the seasonal variation a statistically high DGM concentration was observed in warm season, indicating that DGM was effectively produced by strong solar radiation and high water temperature. There was no relationship between TM and DGM concentrations in Yangsuri marsh, as observed in other studies. DGM in Yangsuri marsh was supersaturated for most of sampling period; therefore, one can conclude that
in water surface can readily volatilize to the atmosphere.
Potential Human Risk Assessment of PCBs and OCPs in Edible Fish Collected from the Offshore of Busan
Choi, Jin Young ; Yang, Dong-Beom ; Hong, Gi-Hoon ; Kim, Suk Hyun ; Chung, Chang Soo ; Kim, Kyoung-Rean ; Cho, Kyung Duk ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 810~820
DOI : 10.4491/KSEE.2012.34.12.810
Polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) contents in marine sediment and edible fish (4 species) from the estuary near the Yongho wharf in Busan were determined to assess their presence and their potential health risk to the local population through fish consumption was also assessed. Levels of
in marine sediment were 3.22~197.65 and 1.77~20.27 ng/g dw, respectively. HCHs and endosulfan sulfate concentrations in bottom sediment were 1.42~6.08, 0.56~13.89 ng/g dw, respectively. The bottom sediment in the offshore of the Yongho wharf may be characterized as semi-polluted status with potential adverse marine biological effects in terms of sediment quality guidelines of US NOAA. The mean concentrations of
in the tissues of olive flounder (Paralichthys olivaceus), Korean rockfish (Sebastes schlegelii), file fish (Stephanolepis cirrhifer) and abbysal searobin (Lepidotrigla abyssalis) were 67.37, 10.20, 48.26, 22.81 ng/g lw, respectively. DDTs and HCHs were also detected in all fish samples. Lifetime cancer risk and target hazard quotient to local residents due to those fish consumption were found to pose negligible cancer and non-cancer risk.
A Study on the Closed-Loop Air Drying Technology for Drying Wastewater Sludge
Lee, Jung-Eun ; Cho, Eun-Man ; Kang, Dong-Hyo ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 821~827
DOI : 10.4491/KSEE.2012.34.12.821
Air drying is a technology to dry sludge at the ejector and multi cyclone as intaking and blowing air from outside. So, this technology has a weak point that operating fluctuation is large according to an outside conditions as well as energy consumption is also large due to open loop structure. This is to develop the closed-loop air drying system to be built the dehumidifier consisted of condenser, cooler and compressor at rear side of separator of air dryer, as a way to solve some problem. Air is circulation by the method of blowing-drying-dehumidifying-blowing within this system. It is analyzed that an air circulated at closed-loop air drying equipment contains the energy of 50% more compared with open-loop air drying and is operated regularly because of quality maintenance of air to dry sludge. And also it is analyzed that the cost of drying sludge of 1 ton by closed-loop air drying equipment is lower about 35% than conventional equipment. Therefore, this is evaluated by useful drying technology to face an unexpected climatic conditions due to regular operation as well as low energy consumption.
Basic Performance Evaluation of the Ecotoxicity Detection Device for Heavy Metals
Kim, IlHo ; Kim, Ji-Sung ; Yoon, Young-Han ; Ban, Hyo-Jin ; Kim, Seok-Gu ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 828~834
DOI : 10.4491/KSEE.2012.34.12.828
The ecotoxicity detection device for preliminary test (Test jig) was manufactured to develop the biological early warning system using Vibrio fischeri. In this study, the ecotoxicity detection charateristics of the Test jig was investigated for 6 heavy metals (Cr, Zn, Pb, Cd, Cu and Hg). It was observed that relative luminescence unit (RLU) of Vibrio fischeri constantly decreased by the concentrations of the tested heavy metals. In contrast with other heavy metals, RLUs of Pb and Hg constantly decreased even at low concentrations. RLU of Hg drastically decreased when its concentration increased from 0.13 mg/L to 0.25 mg/L.
values of Cr, Zn, Pb and Cd gradually decreased with exposure time, whereas there was no significant change in
values of Cu and Hg with time. On the other hand,
values between the Test jig and Reference device were compared to evaluate the ecotoxicity detection performance of the Test jig. No big difference was found in
vlaues between the two devices, indicating that the Test jig could be applied as the ecotoxicity detection device for heavy metals.
The Analysis of Effect of Surface Shape and Pattern of Noise Barrier Panel on the Noise Reduction
Kim, IlHo ; Ahn, Hosang ; Park, Jong-Bin ; Kim, Gwang Soo ; Lee, Ju Haeng ; Ko, Junhee ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 835~839
DOI : 10.4491/KSEE.2012.34.12.835
In recent decades, a lot of noise barriers have been installed along paved road in order to reduce the road induced noise, which increases as traffic volume grows. For better range of sight, transparent noise barriers are widely installed despite of reflecting noise. In this study, the effect of surface shape and pattern of noise barriers on the reduction of reflecting noise was analyzed to maximize the noise reduction. According to the number of shape and pattern, it was observed that there were noise reduction effect as of 0.9~1.5 dB(A). It was found that the spatial field where the noise concentrates or disperses changes according to the width of blocks on the barriers as well. It suggests that there might be possibility of surface shape modification to optimize the noise reduction technology.
The Study of Model Biogas Catalyst Reforming Using 3D IR Matrix Burner
Lim, Mun Sup ; Chun, Young Nam ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 840~846
DOI : 10.4491/KSEE.2012.34.12.840
Global climate changes caused by
emissions are currently debated around the world; green sources of energy are being sought as alternatives to replace fossil fuels. The sustainable use of biogas for energy production does not contribute to
emission and has therefore a high potential to reduce them. Catalytic steam reforming of a model biogas (
= 60%:40%) is investigated to produce
-rich synthesis gas. The biogas utilized 3D-IR matrix burner in which the surface combustion is applied. The ruthenium catalyst was used inside a reformer. Parametric screening studies were achieved as Steam/Carbon ratio, biogas component ratio, Space velocity and Reformer temperature. When the condition of Steam/Carbon ratio,
ratio, Space velocity and Refomer temperature were 3.25, 60% : 40%,
respectively, the hydrogen concentration and methane conversion rate were showed maximum values. Under the condition mentioned above,
/CO ratio, CO selectivity and energy efficiency were 0.65, 2.14, 0.59, 51.29%.
Analysis of Research Trend and Development Direction on Domestic and International Noise Barriers
Ahn, Hosang ; Kim, Ilho ; Park, Jong-Bin ; Lee, Ju Haeng ; Kim, Gwang Soo ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 847~854
DOI : 10.4491/KSEE.2012.34.12.847
The demand for noise barriers and necessity for the installation are highly growing because residential areas have become diverse and locational priority is changed to consider how to approach highway easily. However, public annoyance to the noise generated from highway is continued despite lots of noise barrier are installed. Moreover, there are growing concerns to maintain noise barriers to be free from losing transparency, dust stack, and shock fracture. To resolve these issues, it is suggested to develop new polymer materials and conceptually new noise barrier. In this study, as a first step to develop a new noise barrier to overcome current technological challenges as well as economic issues, recent research trends have been analyzed and found the direction for the future research in terms of material, supplementary function, and patterning.
Research Trends for Nanotoxicity Using Soil Nematode Caenorhabditis elegans
Kim, Shin Woong ; Lee, Woo-Mi ; An, Youn-Joo ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 855~862
DOI : 10.4491/KSEE.2012.34.12.855
Caenorhabditis elegans, a free-living nematode mainly found in the soil pore water, roles the critical function in trophic levels, energy flow, and decomposition in soil ecosystem. C. elegans is commonly used species to test soil toxicity. Recently, they are employed broadly as a test organism in nanotoxicology. In this study, a review of the toxicity of nanomaterials for C. elegans was presented based on SCI (E) papers. The nanotoxicity studies using C. elegans have been reported in 20 instances including the mechanism of toxicity. Most studies used K-medium, S-medium, and NGM (Nematode Growth Medium) plate as an exposure medium to test toxicity of nanoparticles. The effects observed include anti aging, phototoxicity, genotoxicity, and dermal effects on C. elegans exposed to nanoparticles. We found that the toxic mechanisms were related with various aspects such as lifespan abnormality, oxidative stress, distribution of particles on inter-organisms, and stress-related gene analysis. C. elegans has advantage to test toxicity of nanoparticles due to various cellular activities, full genome information, and easy observation of transparent body. C. elegans was considered to be a good test species to evaluate the nanotoxicity.
Recent Developments and Field Application of Foreign Waterworks Automatic Meter Reading
Joo, Jin Chul ; Ahn, Hosang ; Ahn, Chang Hyuk ; Ko, Kyung-Rok ; Oh, Hyun-Je ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 12, 2012, Pages 863~870
DOI : 10.4491/KSEE.2012.34.12.863
The market trends of automatic meter reading associated with smart water meters were investigated. Also, recent developments and field applications of key technology for automatic meter reading associated with smart water meters were analyzed. Smart water meters have been manufactured mostly in United States and Europe and have been expanded their business to Asia. Integrated water management system combining with the additional functions such as real-time consumption metering, cost notification, water conservation, leak detection, water quality monitoring, and flow control have been operated in automatic meter reading. Both water quality and quantity data measured from smart water meters and sensors were transferred to data concentration units through neighborhood area network, and then were transferred to integrated server through wide area network. The data transfer methods were determined by comprehensively considering urban scale, density of smart water meters, power supply and network topologies. Common data collection methods such as fixed network to data concentation units, vehicles drive by, people walk by, and drone fly by have been applied. The automatic meter reading associated with smart water meters are spread throughout the world, and both water and energy savings result in saving the money and reducing the greenhouse gases emission.