• Journal of Soil and Groundwater Environment
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• v.25 no.1
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• pp.1-11
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• 2020

본 연구에서는 라돈가스의 환경적 문제점을 구체적으로 파악하였다. 각 나라별 라돈가스 환경문제 사례 분석을 통하여 국가별 라돈 가스 농도와 위험도를 조사하였다. 환경적 문제가 되는 라돈가스 유입의 방지법을 조사 및 연구하여 소개한다

• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.3
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• pp.283-289
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• 1993

Effect of sulfur dioxide gas on the growth and yield of soybean growing in the On-San Industrial Complex area was evaluated using the isoquant contour lines of the sulfur dioxide in air of the area. Average concentration of sulfur dioxide monitored in the Industrial Complex from July 17 to September 17 was 0.77mg / 100cm$^2$ PbO$_2$/day. Soil pH ranged from 4.2 to 6.5. Yield losses were estimated by 5～30% due to the effect of sulfur dioxide. Liming could relieve the yield reduction to some extent. The cumulative $SO_2$ concentration, as measured by PbO$_2$ method, for two months of active vegetative growth to early ripening stage has shown a good negative correlation with soybean yield. But, pod number and 100 grain weight did not show the correlation with the concentration of sulfur dioxide. These results suggest that sulfur dioxide affect chronically and cumulatively the growth of soybean plants.

• Journal of the Korean Society of Hazard Mitigation
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• v.1 no.3 s.3
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• pp.83-92
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• 2001

Field investigations for subsurface soil and groundwater at a gas station showed that the site was severely contaminated and even petroleum compounds as free liquid state were observed. Pilot-scale soil flushing and soil vapor extraction process(SVE) were applied to evaluate the effectiveness of pollutants removal. Surfactant solution, Tween 80, was used to enhance the solubility of petroleum compounds and resulted in about 10 times increase on TPH(Total Petroleum Hydrocarbon) concentration. As for SVE method, maximum concentration of TPH and BTEX reached within 24 hours of extraction and then continuously decreased. Considerations on the groundwater level and the kinetic limitation for volatilization of contaminants have to be taken into account for the effective application of SVE process.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2001.04a
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• pp.160-163
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• 2001

유류 오염 토양에 pilot scale 규모의 토앙세척법(soil flushing)과 토양증기추출법(SVE)을 설치하여 운전하였다. 토양세척법의 경우 용매인 알콜류를 주입하고 2일 이후부터 계면활성 재인 Tween 80 용액을 주입 한 후 하부에서 추출된 유출수내의 오염물질의 농도를 측정한 결과 BTEX, Diesel 및 n-Alkane의 농도는 계면활성제 수입 전파 후의 비율이 최대 각각 15배 7.8배 및 47배의 농도 증가를 보였으며 TPH 농도의 증가는 약 10배에 이르는 것으로 조사되었다. 또한 토양증기추출법의 경우 가스 추출로 제거된 가스성분의 누적량을 보면 약 19일의 운전기간동안 BTEX와 TPH 총량 기준으로 약 30 kg 및 708 kg이 제거되었으며 BTEX와 TPH에 대한 최대 제거효율은 각각 4 kg/day 및 90 kg/day 였다.

• Geophysics and Geophysical Exploration
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• v.8 no.2
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• pp.137-144
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• 2005

In this study, we offered the results of geophysical and geochemical survey on the municipal waste disposal area to delineate the size and extent of leachate contamination. Preliminary to intensive geochemical investigation, we performed two geophysical methods to characterize the survey area. Electromagnetic (EM) and magnetic method were used far site investigation. From the EM method, we can get the information of soil conductivity directly related to the leachate of the contaminations and from magnetic anomalies we can find the boundary of landfill which is not identified on the surface due to soil capping. The results of geophysical survey were well matched to those of geochemical method carried out inside and near the landfill. Electric conductivity (EC) of the groundwater sampled from low resistivity anomaly region of EM result was higher than background value and the border estimated from the magnetic survey showed good agreement with that estimated from the soil gas detection survey.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1996.11a
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• pp.102-105
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• 1996

난지도 매립지는 매립충의 불균질성과 고온의 침출수 및 가스의 흐름이 동시에 복합적으로 일어나는 현상 때문에 수리지질학적으로 매우 복잡한 지역이다. 난지도의 수문층서단위 조사와 디스크-장력 침투계(Disc tension Infiltrometer)로 불포화대 수리 특성을 추정하였으며 가스 거동 현상을 이해하기 위해 지온을 측정하였다. 매립지 주변의 지하수위 변화를 조사하기 위해 양수정과 다중-수위관측정(Multi-Level Monitoring Well)에서 수위변화를 관측하였다. 불포화대 수리특성과 기상자료를 바탕으로 매립지로의 순침투량을 추정하였다. 이것을 근거로 총 침출수 발생량을 추정하였으며, 기저 지하수면 상부에 분포하는 포화 침출수대, 즉 부유침출수의 생성 메카니즘에 대한 연구도 수행하였다.

• Proceedings of the Turfgrass Society of Korea Conference
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• 2011.02a
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• pp.11-21
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• 2011

경기도 여주군의 R골프장에서 페어웨이 건설 시 토양조사 및 적절한 토양개량이 실시되지 않아 배수불량지역의 발생한 것으로 한 것으로 분석되었다. 원인 분석결과 토양 경화로 인한 토양 물리성이 악화되어 있어, 투수에 의한 토양 하부층으로의 배수능력이 저조하여 배수 불량의 직접 원인이 되었다. 또 재배 지역의 토양과 이식 지역의 토성이 달라 이식 후 토양에 이질층이 형성되어 수분의 하층 이동이 원활하지 못해 배수 불량의 원인되고 잔디의 생육이 나빠지게 되었다. 배수불량의 결과로 인해 토양 내 산소가 부족하게 되어 토양이 환원 상태가 되면서 혐기성 미생물의 생육이 증가하고, 메탄가스가 축적되고 악취를 유발시키며 토양의 공기순환이 자유롭지 못해 식재된 잔디의 뿌리 생장에 악영향을 주어 결과적으로 잔디 생육이 불량하게 되는 연쇄적인 문제가 발생하였다. 골프장 운영 중 잔디 지반의 문제로 잔디 생육 불량을 초래 할 수 있는 여러 가지 요인들을 제거하기 위해 골프코스 건설시 모재 토양의 사전 조사 및 잔디 지반으로서의 적합성에 대하여 반드시 실험 분석하여야 하며, 건설 후 지반의 배수불량을 개선하기 위해서 배수구 설치, Sand capping, 잔디 보식, 토양개량재의 사용, 배토 등 경종적 관리 등의 방법을 이용하여 배수불량지역의 개선과 잔디생육 정상화를 시행하였다.

• The Journal of Engineering Geology
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• v.10 no.2
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• pp.189-214
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• 2000

Three study areas of Kwanak campus(Seoul National University), Gapyung and Boeun were selected and classified according to bedrock types in order to investigate soil-gas radon concentrations. Several soil-gas samples showed relatively high radon concentrations in the residual soils which derived from granite bedrock. It also showed that water content of soil and the degree of radioactivity disequilibrium was a secondary factor governing radon emanation and distribution of radon radioactivity. The results of radon concentrations and working levels for forty rooms in Kwanak campus, Seoul National University, showed that indoor basement rooms under poor ventilation condition can be classified as high radon risk zone having more than EPA guideline(4 pCi/L). Some results of section analysis which was surveyed in the fault zone of Kyungju and Gapyung area confirmed the existence of fault-associated radon anomalies with a meaning of radon risk zone.

• Journal of Korean Society of Environmental Engineers
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• v.27 no.3
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• pp.316-322
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• 2005

In this study, the concentration of 17 dioxin congeners in the soil samples near a waste incinerator with respect to distance from incinerator and wind directions were investigated. The effect of PCB source was investigated using the cluster analysis method. The total concentration and I-TEQ concentration of dioxin ranged from 31.065 to 7,257.499 pg/g(dry weight) and from 0.099 to 35.191 pg I-TEQ/g(dry weight.), respectively. There was a weak correlation(not statistically significant) observed between soil concentration and wind direction, and the distance from the incinerator. The reason may be due to the presence of the local combustion sources other than the target incinerator. The fraction of PCDFs and PCDDs was also examined to study the effect of incinerator. The fraction of PCDFs was decreased with the distance from the incinerator. The influence of target incinerator was found within a 500-meter radius. The high concentration in the for site was due to small incinerators and the use of agricultural chemicals such as PCP. To investigate the relationship between soil near the incinerator and the sources, the cluster analysis was conducted using the congener pattern. As a result soil samples were divided into four groups and were qualitatively estimated the influence of sources such as incinerator and PCP by comparing the congener pattern of each roups. It was thought that a cluster analysis was a useful statistical method for the source estimation of dioxin.

• Journal of Korea Soil Environment Society
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• v.3 no.2
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• pp.3-12
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• 1998

To analyze of oils in contaminated soils, it is necessary to classify of oils accurately and it has to be selected suitable extraction method and instrumental analysis method in according to the character of sample. In this study, oils are classified into three groups-gasoline, diesel and kerosene-we consider extraction methods and quantitative analysis method of these oils using GC/MS. As the analysis example of real sample, we analyze some gasolines and diesels of some oil refining company and calculate BTEX in gasoline and saturated n-hydrocarbons in diesel. And also, we study the representative quantitative method of each kind of oils.