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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Marine Environment & Energy
Journal Basic Information
Journal DOI :
The Korean Society for Marine Environmental Engineering
Editor in Chief :
Volume & Issues
Volume 17, Issue 4 - Nov 2014
Volume 17, Issue 3 - Aug 2014
Volume 17, Issue 2 - May 2014
Volume 17, Issue 1 - Feb 2014
Selecting the target year
Application of Granulated Coal Ash for Remediation of Coastal Sediment
Kim, Kyunghoi ; Lee, In-Cheol ; Ryu, Sung-Hoon ; Saito, Tadashi ; Hibino, Tadashi ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 1~7
DOI : 10.7846/JKOSMEE.2014.17.1.1
This paper aims to explain the safety assessment and remediation mechanism of Granulated Coal Ash (GCA) as a material for the remediation of coastal sediments and to evaluate the improvement of the sediment in Kaita Bay, where GCA was applied. The concentrations of heavy metal contained in GCA and the dissolved amounts of heavy metal from GCA satisfied the criteria for soil and water pollution in Japan. The mechanisms on the remediation of coastal sediments using GCA is summarized as follows; (1) removal of phosphate and hydrogen sulfide (2) neutralization of acidic sediment (3) oxidation of reductive sediment (4) increase of water permeability (5) increase of soil strength (6) material for a base of seagrass. From the results obtained from the field experiment carried out in Kaita Bay, it was clarified that GCA is a promizing material for remediation of coastal sediment. This remediation technology can contribute to promote waste reduction in society and to decrease cost of coastal sediment remediation by applying GCA in other polluted coastal areas.
Conditions of Desalination with Reduced Pressure Evaporation Device
Ji, Ho ; Yun, Sung Yeol ; Lee, Seung Won ; Moon, Deok Soo ; Lee, Ho Saeng ; Kim, Hyeon Ju ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 8~12
DOI : 10.7846/JKOSMEE.2014.17.1.8
Reduced pressure evaporation applies the principle of lowering water's boiling point by reducing the pressure. It uses the relation between temperature and pressure to reduce energy consumption needed for elevating temperature. As the result, the highest evaporation was observed at
and -40 cmHg applying saturated vapor pressure depending on different seawater temperature. It was found that the higher concentration in the factor test experiment depending on seawater concentration induced the higher evaporation. Also, in the factor test experiment, the amount of evaporation increased as the pressure decreased. It is concluded that the most important factor of evaporation was concentration, the second important factor was temperature, and the least important factor was pressure. Through this experiment, optimized conditions of desalination with reduced pressure evaporation device were verified.
The Effect of Feed Temperature On Permeate Flux During Membrane Separation
Kim, Kwang Soo ; Moon, Deok Soo ; Kim, Hyeon Ju ; Lee, Seung Won ; Ji, Ho ; Jung, Hyeon Ji ; Won, Hye Jung ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 13~19
DOI : 10.7846/JKOSMEE.2014.17.1.13
The feed temperature has an effect on the performance during desalination of seawater by membrane separation. When the permeate flux intends to increase using the waste heat, it is necessary to analyze the effect of feed temperature precisely on the membrane performance. The experiments were carried out to investigate the performance of membranes by varying the seawater temperature from
. The increase of permeate flux with increase of feed temperature was interpreted as the change of water viscosity and the membrane itself. While the increase of permeate flux could be predicted by the viscosity change in case of nanoflitration membrane, there exists 30% difference between the experiment data and the prediction by the viscosity change in case of reverse osmosis (RO) membrane, which seems to be due to 8% decrease of the pore size in 60caused by the contraction of membrane with the increase of temperature. Therefore, the desalination of seawater should be carried out within the range that the elevation of temperature does not cause the alteration of membrane itself even for the purpose of increasing the permeate flux.
Fluid-Structure Interaction Analysis for Open Water Performance of 100 kW Horizontal Tidal Stream Turbine
Park, Se Wan ; Park, Sunho ; Rhee, Shin Hyung ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 20~26
DOI : 10.7846/JKOSMEE.2014.17.1.20
It is essential to consider the effect of blade deformation in order to design a better tidal stream turbine being operated in off-design condition. Flow load causes deformation on the blade, and the deformation affects the turbine performance. In the present study, CFD analysis procedures were developed to predict open water performance of horizontal axis tidal stream turbine (HATST). The developed procedures were verified by comparing the results with existing experimental results. Fluid-structure interaction (FSI) analysis method, based on the verified CFD procedure, have been carried out to estimate the turbine performance for a turbine with flexible composite blades, and then the results were compared with those for rigid blades.
Determination of Petroleum Aromatic Hydrocarbons in Seawater Using Headspace Solid-Phase Microextraction Coupled to Gas Chromatography/Mass Spectrometry
An, Joon Geon ; Shim, Won Joon ; Ha, Sung Yong ; Yim, Un Hyuk ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 27~35
DOI : 10.7846/JKOSMEE.2014.17.1.27
The headspace solid-phase microextraction (HS-SPME) followed by gas chromatography/mass spectrometry procedure has been developed for the simultaneous determination of petroleum aromatic hydrocarbons such as benzene, toluene, ethylbenzene and xylene isomers (BTEX) and polycyclic aromatic hydrocarbons (PAHs) in seawater. The advantages of SPME compared to traditional methods of sample preparation are ease of operation, reuse of fiber, portable system, minimal contamination and loss of the sample during transport and storage. SPME fiber, extraction time, temperature, stirring speed, and GC desorption time were key extraction parameters considered in this study. Among three kinds of SPME fibers, i.e., PDMS (
), CAR/PDMS (
), and PDMS/DVB (
PDMS/DVB fiber showed the most optimal extraction efficiencies covering molecular weight ranging from 78 to 202. Other extraction parameters were set up using
PDMS/DVB. The final optimized extraction conditions were extraction time (60 min), extraction temperature (50), stirring speed (750 rpm) and GC desorption time (3 min). When applied to artificially contaminated seawater like water accommodated fraction, our optimized HS-SPME-GC/MS showed comparable performances with other conventional method. The proposed protocol can be an attractive alternative to analysis of BTEX and PAHs in seawater.
Ultimate Strength Analysis of Connections of Floating Pendulum Wave Energy Converter
Sohn, Jung Min ; Cheon, Ho Jeong ; Shin, Seung Ho ; Hong, Key Yong ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 36~41
DOI : 10.7846/JKOSMEE.2014.17.1.36
A floating offshore structure has high tendency to occur the buckling when compressive, bending and shear loads applied. When the buckling is occurred, in-plane stiffness of structure is remarkably decreased. And it has a harmful effect on the local structural strength as well as global structural strength. In the present study, it has been investigated the ultimate strength of tubular members which is located between a floater and a damping plate of the floating pendulum wave energy converter. Nonlinear finite element method is conducted using the initial imperfection according to 1st buckling mode which is obtained from the elastic buckling analysis. It is also noted the ultimate bending strength characteristic varying with a diameter, thickness and stiffeners of the tubular member.
Experimental Study on the Stress Variation of Concrete Containing F-fiber Extracted from Waste FRP
Yoon, Koo Young ; Park, Jong Won ; Lee, Seung Hee ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 42~45
DOI : 10.7846/JKOSMEE.2014.17.1.42
Even though to discard the waste FRP (Fiber-Reinforced Plastic) is urgent and problematic, the way to do it has not been efficient. In our project team the FRP have been splitted into some layers which have different physical properties; mat and roving layers. Among those, the roving layer woven like a basket by bundles of glass fibers has been cut into reusable fibers called 'F-fiber'. F-fiber is 1 mm or 3 mm in width and 3 cm in length. It is used in fiber-reinforced concrete (FRC) with 0.5%, 0.7%, 1.0%, or 1.5% of volume ratio. Produced FRC was tested in compressive, tensile, and bending stress in contrast to the without-fiber (standard) concrete and 0.1% polypropylene reinforced concrete (PP-FRC). The tensile and bending stresses are more or less those of PP-FRC. The compressive stress, however, is similar (with 3 mm F-fiber) to or lower (with 1 mm F-fiber) than that of standard concrete. Conclusively the usage of the waste FRC in concrete is advised to be limited to the one where the compressive stress is not much critical.
Compressive Strength and Fire Resistance Performance of High Strength Concrete with Recycled Fiber Power from Fiber-Reinforced Plastics
Lee, Seung Hee ; Park, Jong Won ; Yoon, Koo Young ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 46~51
DOI : 10.7846/JKOSMEE.2014.17.1.46
Increasing of waste FRP (fiber reinforced plastics) has caused environmental problems. Recently, the technology of making fibers from waste FRP, which can be used to reinforce the concrete, was developed and the reinforced concretes were tested to study the structural performance. The purpose of this study is to investigate the effect of the powder, obtained together with F-fiber from the waste FRP, on the compressive strength and the fire resistance performance as in the high strength concrete. Strength tests show that the use of recycled FRP powder does not reduce the compressive strength of high strength concrete if the volume fraction of FRP powder is less than 0.7%. Electric furnace test results also show that the use of recycled FRP powder may increase the fire resistance performance of high strength concrete significantly.
Changed Aquatic Environment Due to An Estuary Dam: Similarities and Differences Between Upstream and Downstream
Yang, Jae Sam ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 1, 2014, Pages 52~62
DOI : 10.7846/JKOSMEE.2014.17.1.52
As a case study of the changed aquatic environment due to an estuary dam, the Geum River Estuary Dam System (GREDS) has been investigated for the last two decades. We sought the similarities and differences in the disrupted aquatic environment between the estuarine and lacustrine sides of the GREDS. Both sides of the GREDS shared similar aquatic disruptions, such as elongated hydraulic residence times, deteriorated water quality, highly accumulated organic-rich sediments, and considerable siltation of river-transported materials prior to reaching coastal waters. The disruptions of water quality such as high nutrients concentration and frequent bloom of blue-green algal are much more noticeable in the reservoir than in the estuary. However serious siltation problem has been reported from the estuary, which will possibly threaten the proper functioning of the natural Kunsan Estuarine System.