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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Soil and Groundwater Environment
Journal Basic Information
Journal DOI :
Korean Society of Soil and Groundwater Environment
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Volume & Issues
Volume 9, Issue 4 - Dec 2004
Volume 9, Issue 3 - Sep 2004
Volume 9, Issue 2 - Jun 2004
Volume 9, Issue 1 - Mar 2004
Selecting the target year
Complex Dielectric Constant of Soil Contaminated by Landfill Leachate with Measured Frequency
Oh Myoung-Hak ; Bang Sun-Young ; Park Jun-Boum ; Lee Ju-Hyung ; Lee Seock-Heon ; Ahn Kyu-Hong ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 1~11
To evaluate the applicability of dielectric constant measurement method on the geoenvironmental investigation of subsurface contaminated by landfill leachate, the analysis on dielectric characteristics of sand containing contaminated pore water by landfill leachate was performed. The separate real and imaginary parts of dielectric constant were investigated in the frequency range of 75kHz to 12MHz. The real part of dielectric constant increased at the lower frequency wherea the real part of dielectric constant decreased at the higher frequency as the concentration of leachate increased. These results can be explained by the frequency dependence of space charge polarization and orientation polarization. The imaginary part of dielectric constant on the contaminated sand with leachate increased with their concentration for whole frequency range. These results are caused by the increase of energy loss due to the enhancement of conduction in soil with leachate concentration. The results in this study indicate that the dielectric constant measurement method has potential in evaluating the contaminated soil and pore water by landfill leachate.
Polycyclic Aromatic Hydrocarbon (PAH) Binding to Dissolved Humic Substances (HS): Size Exclusion Effect
Hur, Jin ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 12~19
Binding mechanisms of polycyclic aromatic hydrocarbons (PAHs) with a purified Aldrich humic acid (PAHA) and its ultrafiltration (UF) size fractions were investigated. Organic carbon normalized binding coefficient (
) values were estimated by both a conventional Stern-Volmer fluorescence quenching technique and a modified fluorescence quenching method. Pyrene
values depended on PAHA concentration as well as freely dissolved pyrene concentration. Such nonlinear sorption-type behaviors suggested the existence of specific interactions. Smaller molecular size PAH (naphthalene) exhibited higher
value with medium-size PAHA UF fractions whereas larger size PAH (pyrene) had higher extent of binding with larger PAHA UF fractions. The inconsistent observation for naphthalene versus pyrene was well explained by size exclusion effect, one of the previously suggested specific mechanisms for PAH binding. In general, the extent of pyrene binding increased with lower pH likely due to the neutralization of acidic functional groups in HS and the subsequent increase in hydrophobic HS region. However, pyrene
results with a large UF fraction (>100K Da) corroborated the existence of the size exclusion effect as demonstrated by an increase in
values at a certain higher pH range. The size exclusion effect appears to be effective only for the specific conditions (HS size or pH) that render HS hole st겨ctures to fit a target PAH.
Multiphase Modeling on the Convective Transport of an Organic Solvent through Unsaturated Soils
Lee Kun Sang ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 20~26
In-situ photolysis is one of the most promising ways to clean up a soil contaminated with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). This study focuses on the mathematical description and model development of the convective upward transport of an organic solvent driven by evaporation and photodecomposition at the surface as the major transport mechanism in the clean up process. A finite-element-based numerical model was proposed to incorporate effects of multiphase flow on the distribution of each fluid, gravity as a driving force, and the use of van Genutchen equation for more accurate description of k-S-p relations. This paper presents results of extensive numerical calculations conducted to investigate the various parameters that play a role in the solvent migration through a laboratory-scale unsaturated soil column. The numerical results indicate that gravity affects significantly on the fluids distribution and evaporation for highly permeable soils. The soil texture has a profound influence on the fluid saturation profile during evaporation process. The amount of solvent convective motion increases with increasing evaporation rates and decreasing initial water saturation. Simulations conducted in this study have shown that the developed model is very useful in analyzing the effects of various parameters on the convective migration of an organic solvent in the soil environments.
Hydrogeologic Parameter Estimation by Using Tidal Method in a Fractured Rock Aquifer
Shim Byoung Ohan ; Chung Sang Yong ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 27~32
The oceanic tides have an effect on groundwater levels in coastal fractured rock aquifers. The observed groundwater table fluctuations caused by the effective stress through an aquifer are shown as sine curves similar with tidal fluctuation. To estimate a hydrogeologic parameter, tidal method is utilized with groundwater level fluctuations of two monitoring wells. Cross correlation function is used to calculate time lags between observed groundwater levels and tide, and the deeper well shows longer time lag. The storage coefficients calculated by using tidal efficiency and time lag show large differences. The storage coefficients obtained by using time lags are close to the result of slug test, and that of the deeper well shows closer value by slug test. The tidal efficiency is unsatisfied to apply in the tidal method because of an effect of phreatic aquifer and the vertical flow of groundwater through fractured confining bed. This tidal method can be an economical and effective way to define the parameter by considering the location of observation well and hydrogeologic characteristics of a coastal aquifer.
Comparing the Analytical Results for the Determination of Weathered Diesel in Soils According to the Different Methods
Lee Goon-Taek ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 33~37
Soil samples used in this study were taken from the site at which diesel spill accident had occurred in 1995. It was confirmed that all of soil samples were contaminated with diesel which was going on weathering. The concentrations of diesel in soils were determined by Korea standard method revised in July 1999 (Method 1) and US EPA method 8015b (Method 2). Some additional soil samples were analyzed with Korea standard method revised in July 2002 (Method 3) to compare the accuracy and reproducibility with Method 2. The only four of forty-six samples were determined when the analysis carried out according to Method 1 while forty-three of forty-six samples had the value above criterion (2000mg kg
) according to Method 2. There were no significant differences between the results of the analysis by Method 2 and Method 3. Based on these results, Method 2 and 3 were more appropriate than Method 1 for the determination of weathered diesel in soil. Method 2 had almost equivalent accuracy and reproducibility to Method 3.
A Case Study of Monitored Natural Attenuation at the Petroleum Hydrocarbon Contaminated Site : II. Evaluation of Natural Attenuation by Groundwater Monitoring
Yun Jeong Ki ; Lee Min Hyo ; Lee Suk Young ; Noh Hoe Jung ; Kim Moon Soo ; Lee Kang Kun ; Yang Chang Sool ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 38~48
Natural attenuation of petroleum hydrocarbon was investigated at an industrial complex about 45 Km away from Seoul. The three-years monitoring results indicated that the concentrations of DO, nitrate, and sulfate in the contaminated area were significantly lower than the background monitoring groundwater under the non-contaminated area. The results also showed a higher ferrous iron concentration, a lower redox potential, and a higher (neutral) pH in the contaminated groundwater, suggesting that biodegradation of TEX(Toluene, Ethylbenzene, Xylene) is the major on-going process in the contaminated area. Groundwater in the contaminated area is anaerobic, and sulfate reduction is the dominant terminal electron accepting process in the area. The total attenuation rate was about 0.0017∼0.0224day
and the estimated first-order degradation rate constant(λ) was 0.0008∼0.0106day
. However, the reduction of TEX concentration in the groundwater was resulted from not only biodegradation but also dilution and reaeration through recharge of uncotaminated surface and groundwater. The natural attenuation was, therefore, found to be an effective, on-going remedial process at the site.
Degradation of Tetrachloroethylene (PCE) by a Dechlorinating Enrichment Culture Fixed in an Anaerobic Reactor
Lee Tae Ho ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 49~55
A soil enrichment LYF-1 culture from a contaminated site, which could reductively dechlorinate 900
M (ca. 150 mg/L) of tetrachloroethylene (PCE) stoichimetrically into cis-1,2-dichloroethylene (cis-DCE), was established and characterized. The enrichment culture can use yeast extract, peptone, formate, acetate, lactate, pyruvate, citrate, succinate, glucose, sucrose, and ethanol as electron donors for dechlorination of PCE. Addition of NO
as alternative electron acceptors showed complete inhibition of PCE dechlorination, but S
had no significant effect on PCE dechlorination. The enrichment culture was attached to ceramic media in an anaerobic fixed-bed reactor. The fixed-bed reactor showed more than 99％ of PCE degradation in the range of PCE loading rate of 0.13-0.78
moles/L/hr. The major end product of PCE dechlorination was cis-DCE.
Extraction and Analysis of Topographic Variables from DTM: A Case Study in Jeju Island
Kim Seok Choong ; Cho Sung Hyen ; Kim Hyoung Chan ;
Journal of Soil and Groundwater Environment, volume 9, issue 3, 2004, Pages 56~61
The topographic variables, which influence the precipitation phenomena, are classified by elevation (ELEV), slope (SLOPE), distance to sea (SEA), obstruction (OBST), barrier (BAR), roughness (SHIELD), extracted and analysed according to resolutions. This study is performed through 100 m, 200 m, 400 m, 600 m, 800 m and 1,000 m based on 50 m DTM using TOVA (Topographic Variables Extraction Program). The result of a case study on Jeju weather station says that the variance according to resolution is generally less than that according to cardinal direction, but particularly SHIELD values and some cases for 600m resolution have a significant results.