• Journal of the Korean Applied Science and Technology
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• v.40 no.3
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• pp.425-434
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• 2023

An analysis was conducted on landfill gas generation and surface emission by major routes for three landfill sites of S Landfill in the metropolitan area. LS1, which had a total landfill gas generation ratio of 10.9%, accounted for 49.4% of the total surface emissions. The total surface emission of methane alone was 13.6 Nm³/min in the three landfill sites. Among them, the surface emission of methane at LS1, LS2, and LS3 was 8.4(61.7%), 4.0(29.4%), and 1.2 Nm³/min(8.9%), respectively. By emission path in the upper, slope, and dike, it was 7.3(53.2%), 6.4(46.7%), and 0.02 Nm³/min(0.1%). The dike section of the major surface emission areas showed the largest oxidation rate at 87.5%, followed by the upper at 72.3%, and the slope at 71.8%. Based on methane generation, LS1 had the largest surface emission contribution rate, with 61.7% of the total by S Landfill. By major emission path, the slope section of LS1 accounted for 41.7% of the total, the upper section of LS2 24.4%, and the upper section of LS1 20.0%, which accounted for 86.1% of the total methane surface emission of S Landfill. Therefore, it is concluded that intensive management will be necessary.

• Environmental Analysis Health and Toxicology
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• v.7 no.3_4
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• pp.81-84
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• 1992

Physical compositions of solid waste in Wonju, shopping area were investigated with combustibles 78.13% (papers 35.89%, foods 14.41% etc.) incombustibles 21.87% (glass and ceramics 11.02%, metals 6.0% etc.) in 1991, solid waste in apartment area were investigated with combustibles 84.27% (foods 34.29%, papers 22.58% etc.), incombustibles 15.73% (glass and ceramics 8.77%, metals 4.85% etc.) and residence area were characterised with combustibles 70.37% (foods 33.55% , papers 10.53% etc.) and incombustibles 29.63% (ash of briquet 17.29%, glass and ceramics 7.49% etc.). Water qualities of a leachate from municipal landfill of Wonju city were analysed pH 8.0~8.4, total suspended solid 102~140 mg/1, CN￣ 0.003~ 0.008 mg/1, NO$_2$-N 0.108~0.294 mg/1 and phenols 0.46~1.12 mg/1. Volume of the leachate for 20% methemoglobin formation were 0.2~0.4 mg/ml in Octever, 0.3~0.4 ml/ml in December sampling, 0.2~0.3 ml/ml in St.1 and 0.4 ml/ml in St.3.

• Proceedings of the Korean Society of Crop Science Conference
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• 2000.11a
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• pp.105-106
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• 2000

• Proceedings of the Korean Geotechical Society Conference
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• 1993.05a
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• pp.6-27
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• 1993

• Journal of the Korean Society of Groundwater Environment
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• v.5 no.1
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• pp.1-9
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• 1998

Schlumberger soundings and dipole-dipole electrical surveys were carried out in and around the Nanjido waste landfill in August and December, 1995. Survey points were set to be identical as those in August, 1994 and February, 1995 as possible. To elucidate the annual variation of resistivity structure in and around the landfill, 50 electrical soundings and 2 lines of dipole-dipole surveys were conducted. Interpretations of these data show that mean resistivity values become lower and thicknesses of contaminated layers by leachate thicker than those of the previous year in and around the landfill. Especially, mean thicknesses of saturated layers with leachate increased by about 3∼6 m and resistivities of bedrock decreased. Considering actual hydraulic conductivity, such increments of mean thicknesses are somewhat large. But resistivity variations in and around the Nanjido landfill clearly indicates contamination of layers by leachate is in progress even though some errors in measurements and interpretations are considered. On the other hand, sounding data in the back area of the landfill are almost identical to those of the previous year. From these results, it appears that contamination of weathered zone and bed rock is in progress mainly inside and in the front area of the landfill.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.09a
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• pp.377-380
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• 2004

To identify the effect of landfill waste for groundwater and unsaturated air environment, soil gas survey and hydrogeochemical study were executed. The geology of the study area is granite and aquifer is mainly composed of sandy soil. The results of spatial distribution from soil gas showed the boundary of buried waste and processes and degree of waste decomposition. Groundwater contamination by leachate from landfill is controlled by groundwater flow attributed by the original topography and liner.

• Journal of Korean Society for Atmospheric Environment
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• v.17 no.6
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• pp.463-474
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• 2001

In this study, the concentrations of major anthropogenic volatile organic compounds(VOCs) which include benzene, toluene, m, p-xylene, o-xylene, and ethylbenzene were measured at the Nan-ji-do landfill site during the spring and fall season of 2000. the temporal distribution characteristics of these VOCs were investigated over varying time scale. According to our study, the mean concentration of those species were computed to be 1.65$\pm$2.68(benzene), 9.62$\pm$9.32(toluene), 1.84$\pm$2.90(m, p-xylene), 0.83$\pm$1.43(o-xylene), and 1.17$\pm$1.21 ppb(ethylbenzene). The VOCs levels in the study area are not distinctively higher than the level typically found in urban area that can be subject to the influence of various anthropogenic source processes. Inspection of their temporal trends exhibited various patterns for the diurnal(and seasonal) cycle. Although each species showed distinctive patterns in temporal distribution trends, we were able to find the strong correlations among most concurrently measured VOCs except for benzene.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2003.11a
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• pp.497-502
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• 2003

Landfill is an widely applied alternative for clearance of non-contaminated waste or slightly contaminated waste generated from nuclear facilities. In this study, exposure dose is estimated for a worker and a resident at the landfill area in Young-gwang nuclear power plant. Based on evaluated dose, clearance concentrations of each radionuclide are determinated for dose criteria of 10 $\muSv/y$. The results of age-dependent dose are 1.02 $\muSv$ per year for resident and 0.471 $\muSv$ per year for worker. Clearance concentrations for each radionuclide are evaluated from $1.33{\times}10_{-1}$ Bq per gram to $2.85{\times}10^2$ Bq per gram.

• Journal of the Korea Organic Resources Recycling Association
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• v.18 no.2
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• pp.45-54
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• 2010

Field study was conducted for 5 months to investigate the effect of leachate recirculation on aerobic landfill stabilization at active landfilling site. The area of field experiment was $24{\times}24m$ and 9 vertical air injection wells with screen ranging 3~9 m were installed. Aerobic landfill operation for 5 months increased average internal landfill temperature to $70^{\circ}C$ and 8 % of landfill height was settled down. $94m^3$ of leachate was recirculated for 1 month to increase moisture content of landfill to favor microbial degradation of organic matter, which resulted in temporary increase of groundwater level and anaerobic environment. But leachate recirculation triggered increase of internal landfill temperature of neighboring monitoring well. Because excessive leachate recirculation decreased internal landfill temperature by cooling effect, internal landfill temperature should be checked to avoid abrupt decrease of temperature during leachate recirculation. Also, to prevent anaerobic environment, intermittent leachate recirculation was recommended.

• Journal of the Korean Society of Groundwater Environment
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• v.1 no.1
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• pp.1-5
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• 1994

The contaminant migration through the subsurface of Nanjido landfill is studied using a 2-D finite element model of contaminant transport. The leachate mounding caused by the installation of partial slurry wall around the pheriperal area of the Landfill is analysed using the finite difference model of groundwater flow. Model parameters were validated using in-situ concentration data and the behavior of the transport next 30 years is predicted. The sensitivities of chloride concentration by the change of model parameters, e.g. leachate mounding in the Landfill and the dispersivity are analysed. The results of the analyses show that the maximum chloride concentration level near Han River caused by the leachate of Nanjido Landfill would be 1488mg/1 and comes 17 years after the landfill closure. Increase of the leachate concentration is caused by the increase of both the leachate mounding and the dispersivity. However, the rate of concentration increase becomes higher with the rise of leachate mounding level, while it tends to converge a certain concentration with the increase of the dispersivity.