• 한국지반환경공학회 논문집
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• 제6권4호
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• pp.13-26
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• 2005

본 연구에서는 여러 연구자들에 의해 제안된 단일 점토 및 혼합 차수재를 통한 유기 및 무기 오염물질 이동에 관한 연구결과를 정리하여 보았고, 이러한 연구결과를 바탕으로 오염물질 유출 기준을 만족하는 차수재의 두께를 산정할 수 있는 차수재 설계 프로그램을 개발하였다. 본 프로그램을 이용하여 점토 차수재를 통한 $Cl^-$이온의 이동성에 바탕을 둔 매립지 두께를 산정해본 결과 비교적 합리적인 결과를 얻을 수 있었다. 따라서 본 연구에서 개발된 프로그램을 이용할 경우에는 비교적 간편한 방법으로 매립지 차수재의 예비설계를 수행할 수 있을 것으로 사료된다.

• 한국농공학회지
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• 제35권4호
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• pp.47-54
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• 1993

A series of laboratory tests was performed with soil-columns which were compacted with sands and different amount of silt collected from the mid-stream of Gumgang, Korea. A known degree of concentration of PCP(Pentachlorophenol) was poured into the soil-columns and concentration of PCP was monitored and analyzed with time and depth. The results of the study are summarized as follows : 1. PCP was transported into soil along with the movement of moisture under gravitational force. The amount of PCP transported through soil or absorbed by soil varied with soil types. 2. The great amount of PCP was remained at 4~8cm section for the specimen No.2 and at 0~4cm section for the specimen Nos. 3 and 4. Based upon this result it is said that the amount of silt between 30 and 40% may be a threshold value for PCP transported through soil. 3. The amount of PCP remained in the specimen Nos. 2, 3 and 4 is greater than that in the specimen No.1 due to high specific surface of silt and high attraction force between PCP and silt particles in the specimen Nos. 2, 3 and 4. 4. It is said that groundwater under highly permeable soil layer such as specimen No.1 is easily polluted by PCP. That is because the PCP is basically migrated with water under the gravitational force.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권6호
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• pp.8-18
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• 2015

Pollutants such as heavy metals and explosives originating from the military operational ranges can be migrated to adjacent surface water body or offsite soil, and can affect to local residents and aquatic ecosystem. Therefore, Korea Ministry of the National Defense has established various guidelines for environmental management including the installation of pollutant migration prevention facilities (PMPFs) and monitoring methodologies for heavy metals in the operational range soil and effluent and sediment of PMPFs. However, current guidelines neither address the explosive compounds such as 2, 4, 6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) nor suggest detailed environmental investigation protocol. This paper introduces the new “Environmental Management Manual for Military Firing Ranges”, which includes the environmental criteria for explosives as well as the detailed investigation protocol for the affected environmental media including soil, effluent and sediment of PMPFs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1578-1580
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• 1999

Silicone rubber is being used for the housing material of outdoor high voltage insulators such as composite insulator, bushing, surge arrestor and cable terminator because of good tracking and erosion resistance, good hydrophobicity and recovery of hydrophobicity, and chemical stability. In this paper, tracking and erosion resistance of silicone rubber having fluids and different ATH contents were examined. Fluids were selected under the consideration of their molecular weight and chemical structure, expecting the high migration rate, the good pollutant encapsulation, and the long period with good hydrophobicity. Good tracking and erosion resistance and arc resistance have been achieved for the silicone rubber above ATH content 130 phr.

• 대한토목학회논문집
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• 제39권6호
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• pp.751-758
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• 2019

본 연구는 오염부지의 위해성 평가를 위해 수치모의 기반 오염물질의 노출이동경로 평가에 활용가능한 개념모델을 제시하였다. 이를 위하여 1차원으로 유한차분 기법을 적용하여 지하수 내 오염물질 이송확산을 모의하였다. 불포화대 경로에서의 수리지질학적 및 오염물질 매개변수가 가질 수 있는 범위를 설정하여 범용 시나리오 및 오염물질별 시나리오를 구성하여 모의에 적용하였다. 모델에서는 흡착 및 생분해를 갖는 유한차분 1 차원 이송확산이 고려되었고, 또한 초기 농도가 시간이 지남에 따라 고갈되는 것을 가정하였다. 일반 시나리오의 결과는 지하수 침투율이 감소함에 따라, 오염원에서 지하수면까지의 경로가 길어질수록 지하수면으로 유입되는 지점의 농도 범위는 낮아졌다. 특히, 높은 생분해 속도와 오염원의 빠른 고갈의 경우, 범용 시나리오가 좁은 범위의 지하수 유입농도 예측치를 보여주었다.

• Nuclear Engineering and Technology
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• 제55권4호
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• pp.1476-1484
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• 2023

Laboratory experiments and point monitoring of reservoir sediments have proven that stable sulfate reduction (SSR) can lower the concentrations of toxic metals and sulfate in acidic groundwater for a long time. Here, we hypothesize that SSR occurred during in situ leaching after uranium mining, which can impact the fate of acid groundwater in an entire region. To test this, we applied a sulfur isotope fractionation method to analyze the mechanism for natural attenuation of contaminated groundwater produced by acid in situ leaching of uranium (Xinjiang, China). The results showed that δ³⁴S increased over time after the cessation of uranium mining, and natural attenuation caused considerable, area-scale immobilization of sulfur corresponding to retention levels of 5.3%-48.3% while simultaneously decreasing the concentration of uranium. Isotopic evidence for SSR in the area, together with evidence for changes of pollutant concentrations, suggest that area-scale SSR is most likely also important at other acid mining sites for uranium, where retention of acid groundwater may be strengthened through natural attenuation. To recapitulate, the sulfur isotope fractionation method constitutes a relatively accurate tool for quantification of spatiotemporal trends for groundwater during migration and transformation resulting from acid in situ leaching of uranium in northern China.

• 대한의생명과학회지
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• 제16권3호
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• pp.179-185
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• 2010

Benzene is known as a ubiquitous air pollutant and has a carcinogenic influence on the human body. Benzene is also metabolized to other volatile organic compounds (VOCs) in the body such as phenol and hydroquinone (HQ). The metabolites are accumulated and further oxidized by myeloperoxidase in bone marrow. They act as toxic agents and cause a variety of diseases, including cancer, atopic dermatitis and asthma. In this study, we examined the effects of benzene and its metabolites on proliferation, differentiation and chemotaxis of EoL-1 cells, the human eosinophilic leukemia cell line. These chemicals had no effect on the proliferation of EoL-1 cells. Benzene decreased the differentiation of EoL-1 cells induced by butyric acid. HQ was induced the cell death during butyric acid-induced EoL-1 cell differentiation. In a chemotaxis experiment, benzene, phenol and HQ enhanced the cell migration induced by Lkn-1 but not by MCP-1, eotaxin, MIP-$1{\alpha}$ and RANTES. These findings provide the effect of VOCs on the regulation of eosinophil-involved immune response.

• 한국농공학회지
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• 제40권2호
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• pp.112-122
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• 1998

Measurement of electrical resistivity in soils has been used for many years with purpose of estimating in situ porosity or density. Recently electrical resistivity has also been used as an indicator of soil contaimination. This paper presents the result of laboratory experiment to investigate the resistivity variation in contaminated sandy soils. The results can be used with the Cone Penetrometer Test (CPT) result to analyse ground condition. In the experiment, the water content and leachate concentration of soils were controlled by groundwater and leachate, and then the resistivity measurement was made with 'STING-R1' by Advanced Geosciences Inc. In the case of using groundwater, the resistivity was in the range of over 1000${\omega}{\cdot}m$, but in the case of using polluted water by leachate, the resistivity decreased significantly down to 10~ 100${\omega}{\cdot}m$ for the same moisture content. Also the resistivity varied according to the degree of saturatrion. Therefore, if soil is contaminated by leachate, the CPT with electrical resistivity sensor might be used to investigate the contamination status and plume migration. But exact component of leachate and the pollutant concentration are still hard to identify.

• 한국측량학회지
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• 제19권2호
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• pp.125-135
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• 2001

적조에 관한 조사는 육안과 샘플링에 의한 현지조사에 의해 일반적으로 진행되고 있다. 이와 같은 기존의 조사와 분석방법은 적조의 발생과 소멸까지의 경로를 정확하게 예측하기 곤란하였다. 이에 좀더 객관적이고 과학적인 방법으로 적조의 발생과 그 이동경로 등 시·공간적인 환경인자를 분석해 볼 필요성이 대두되고 있다. 본 연구에서는 적조발생에 대한 피해를 최소화하기 위해 원격탐측기법을 적용하였다. 적조의 주요 원인이 되는 해수 온도의 변화, 조류의 변화 등을 자료와 탐측데이터를 활용하였으며, 육지로부터 유입되는 부하 물질 등의 적조원인 데이터를 해석함으로서 남해연안에 발생하는 적조의 현상을 사전에 예측하는 기법을 연구하였으며 그 활용가능성을 제시하고자 하였다.

• 한국지반공학회논문집
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• 제19권3호
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• pp.83-91
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• 2003

본 논문에서는 동전기초음파정화기술을 이용하여 오염지반내의 중금속 및 유기물질을 제거하는 연구를 수행하였는데, 지반내 오염물질의 이동 및 제거에 대한 동전기기술과 초음파기술의 복합효과 분석에 초점을 두었다. 일반적으로 오염지반내에서 동전기기술은 중금속을 제거하는데 탁월하며 초음파기술은 유기물질을 제거하는데 탁월한 것을 보고되어 있는바 이들 두 기술의 장점을 이용한 복합기술을 고안하게 되었다. 특수하게 고안된 실험장비를 이용하여 동전기기술과 초음파기술을 결합한 실내토양세척실험을 실시하였다. 본 실험에서는 단순, 동전기, 초음파, 동전기&초음파의 4조건에 대하여 토양세척실험을 실시하였다. 오염물질로는 중금속으로는 납, 유기물질로는 에틸렌글리콜을 사용하였다. 실험결과 동전기기술과 초음파기술을 도입한 경우 유출량, 투수계수, 오염물질 제거율이 단순기술에 비하여 상대적으로 크게 증가하는 것으로 나타났다. 본 연구를 통하여 동전기초음파정화기술을 현장에 적용할 수 있는 가시적인 결과를 얻게 되었다.