• 한국토양환경학회지
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• 제4권2호
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• pp.87-101
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• 1999

토양세척 기법은 금속-리간드 착물형성을 촉진하여 오염토양으로부터 중금속을 제거하는 효과적인 방법으로 알려져 있다. 본 연구는 폐금속광산 광미와 그 후면 농경지토양의 중금속 오염도 저감에 대한 세척기랩의 적용효과를 검토하기 위해 수행되었다. 실험에 사용된 일부시료에서 구리와 납의 오염도는 토양오염 우려기준 및 대책기준을 초과하였으며 또 다른 시료에서는 카드뮴이 대책기준에 근접하는 오염도를 보였다. 토양시료에 단계적 추출법을 적용하여 실험한 결과에 따르면 광미와 주변토양시료에 존재하는 중금속의 절반 이상이 식물이용가능성 있는 흡착된 형태로 존재함이 밝혀졌다. 또한 단계석 추출법으로 조사한 몇 가지 형태의 중금속 농도와 0.1N HCI 용출실험에서 구한 농도 사이에는 비례관계가 성립하였다. 유기산별 세척능력 비친실험에서 구연산은 위의 세 가지 중금속 모두에 대하여 초산이나 옥살산에 비해 월등한 세척효율을 나타내었다. 그리고, 구연산을 사용하여 토양으로부터 중금속을 세척할 때 세척액의 pH를 5.5이하로 하면 보다 나은 세척효율을 얻을 수 있었다. 구연산 세척법을 이용한 중금속 세척시 효율은 세척액 농도, (세척액/토양)혼합비, 그리고 세척액의 초기 pH에 의존하여 달라졌다. 구연산에 SDS를 같이 투입하여 세척하면 세 가지 중금속 중에서 카드뮴의 세척효율이 가장 크게 개선되었으며 구리 제거율은 변화되지 않았다. 이상에서 알 수 있듯이 구연산 세척기법은 광미와 중금속 오염토양으로부터의 중금속 제거에 적용 가능한 정화방법임이 확인되었다.

• 한국환경복원기술학회지
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• 제27권3호
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• pp.45-56
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• 2024

Heavy metals emitted from urban development do not decompose in the soil and remain for long periods, continually impacting the environment. Since the mid-1990s, there has been increasing societal concern in South Korea regarding soil contamination, prompting various legislative revisions to reduce pollution. This study utilizes the Environmental Impact Assessment Support System (EIASS) to investigate projects in the metropolitan area that have exceeded the Ministry of Environment's soil contamination concern levels from 1989 to 2022 and to examine improvements in the environmental impact assessment (EIA) process. The results reveal that the average concentrations of nine contaminants-cadmium (Cd), copper (Cu), arsenic (As), mercury (Hg), lead (Pb), hexavalent chromium (Cr6+), zinc (Zn), nickel (Ni), and fluoride (F)-have all increased over the years. Among these, Zn had the highest relative proportion, with 37.5% of the 40 sites exceeding environmental concern levels. Investigation of 19 specific projects at these exceedance sites showed that only 7 had documented analyses of contamination causes and remediation plans, and just one had contracted additional remediation services, though results from these efforts were found to be lacking. Furthermore, since 2019, a significant proportion of these sites were involved in residential developments, likely due to government initiatives in new city development and extensive housing supply plans. This research emphasizes the importance of public disclosure of the processes and outcomes of remediation efforts on historically contaminated soils prior to project development. It discusses improvements to the EIA by reviewing current legislation and international examples. The findings of this study are expected to heighten public awareness about heavy metal contamination and enhance transparency in soil remediation efforts, contributing to sustainable environmental management and development.

• 대한토목학회논문집
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• 제26권5C호
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• pp.291-301
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• 2006

본 논문에서는 HERO-2D를 이용하여 전극배치에 따른 2차원 동전기 정화 특성을 예측하였다. 즉 1차원 전극배치와 2차원 전극배치에 대해 전극 간 간격을 변화시키면서 나타나는 동전기 현상을 예측하고, 이러한 예측결과를 토대로 소비 전력량, 전극 설치 비용과의 상관관계를 분석하여 각각의 전극배치마다의 전극간격을 결정하였다. 연구 결과 대상지역의 높은 정화효율이 요구되는 경우에는 높은 전체 정화효율을 나타내는 전극배치를 채택하는 것이, 대상부지에서 시공상의 어려움이 예상되는 경우에는 2차원 전극배치에 비해 시공이 용이한 1차원 전극배치를 채택하는 것이 바람직한 것으로 나타났다. 4각형 전극배치는 전력소비량과 단위전력당 정화속도, 그리고 전극설치비용 등 경제성 면에서 다른 전극배치보다 우수함을 보여주고 있기 때문에, 시공에 투입되는 비용 절감을 목적으로 할 경우에 적용한다면 최적의 결과를 얻을 수 있을 것이라 판단된다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
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• pp.127-130
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• 2002

Recently, the contamination with heavy metals in closed mines has been seriously considered since it can disturb human health through the polluted drinking-water and crops. Therefore, the concerns about the remediation of polluted land and treatment technology for hazardous matters have been accelerated. However, any of practical methods for treatment and/or remediation have not been yet suggested. In this research, a novel technology was studied to immobilize arsenic in tailings and soils disturbed by mining. In this technology, Fenton-like reaction were applied to immobilize arsenic in tailings. In the examination of Fenton-like reaction using pure pyrite, $H_2O$$_2$ and arsenic, the concentrations of extracted arsenic and iron were reduced up to 90 and 75%, respectively From the result of SEM-EDS, the Immobilization of arsenic was observed on the surface of pyrite. Thus, it can be said that the coating and/or adsorption prevents the extraction of arsenic.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1386-1391
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• 2007

The ballast gravels are often contaminated by various pollutants, like diesel fuel, lubricants, and heavy metals. Especially, the gravels near the switching are apt to be polluted by the lubricant. Because this lubricant can pollute the soil of track, the contaminated ballast gravels should be cleaned immediately. In this study, a physical desorption method was used to remove the oil contaminants from the surface of the ballast gravels. Thermosetting resin was used as a media for physical remediation of ballast gravels. The total petroleum hydrocarbon of the gravels was monitored over time. In addition, scanning electron microscopic images were obtained to observe the removal of the oily pollutants from the surface of the gravels.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
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• pp.44-48
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• 2002

Washing technique using solubilization and surfactant as a extractant was studied by removing contaminants from the cohesive soil contaminated with heavy metal. For this purpose, the laboratory desorption batch tests were peformed in the kaolinite contaminated with lead by using acetic acid as a solubilization and SDS as a anionic surfactant. In desorption batch tests, the effects of extractant concentration and mixing ratio were investigated and also the coupling effects of acetic acid added with surfactant were considered. Test results show that the removal efficiency of acetic acid as a extractant in the kaolinite contaminated with lead increased with increasing the concentration of acetic acid and the acetic acid was found to be more effective when adding CMC 2 or 3 of surfactant. Additionally, regardless of the initial concentration, the efficiency of lead removal from the contaminated soil increased with increasing shaking ratio.

• 한국토양비료학회지
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• 제49권1호
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• pp.81-86
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• 2016

Heavy metal pollution in agricultural fields at the abandoned metal mines has been serious problems in Korea. In order to manage heavy metal pollution in surface water and soil, numerous remediation strategies have been established. Therefore, main purpose of this research was to examine feasibility of ecological toxicity assessment for establishing management strategy in heavy metal polluted agricultural fields. Heavy metal concentration in surface water and soil was monitored along with ecotoxicity experiment with Daphnia magna and Eisenia fetida. Result showed that high toxicity was observed in heavily polluted agricultural field with heavy metals. In case of mortality of Daphnia magna (85%) and Eisenia fetida (6.7%), the highest ratio was observed when heavy metal concentration in surface and soil was high. Calculated ecotoxicity index (EI) ranged 0.06-0.30 and the highest EI was observed in heavily polluted sites among 5 abandoned metal mines. Overall, ecological toxicity assessment is necessary to evaluate heavy metal pollution in agricultural fields near at the abandoned metal mines along with chemical concentration analysis.

• 한국물환경학회지
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• 제20권6호
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• pp.670-675
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• 2004

Humic acids are macromolecules originated from natural water, soil, and sediment. The characteristics of humic acid enable it to change the distribution of metals as well as many kinds of organic contaminants and to determine the sorption of them from soil solution. To see the effect of humic acid on the removal rate of organic contaminants and heavy metals, batch-scale experiments were performed. As a natural geosorbent, black shale was used as a sorbent media, which showed hight sorption capacity of trichloroethylene (TCE), lead, cadmium and chromium. The effect of sorption-desorption, pH, ionic strength and the concentration of humic acid was taken into consideration. TCE sorption capacity by black shale was compared to natural bentonite and hexadecyltrimethylammonium (HDTMA) modified bentonite. The removal rate was good and humic acid also sorbed onto black shale very well. The organic part of humic acid could effectively enhance the partition of TCE and it act as an electron donor to reduce Cr(VI) to Cr(III). Cationic metal of Pb(II) and Cd(II) also removed from the water by black shale. With 3 mg/L of humic acid, both Pb(II) and Cd(II) were removed more than without humic acid. That could be explained by sorption and complexation with humic acid and that was possible when humic acid could change the hydrophobicity and solubility of heavy metals. Humic acid exhibited desorption-resistivity with black shale, which implied that black shale could be an alternative sorbent or material for remediation of organic contaminants and heavy metals.

• Spatial Information Research
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• 제20권4호
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• pp.17-27
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• 2012

본 연구는 한강중상류유역에 위치한 강원광산부지로부터 발생한 중금속의 오염실태를 파악하고자 주성분 분석과 크리깅 공간통계기법을 시도하였다. 토양 심토에서 제1 주성분(PC1)의 경우 광산 주변의 정남쪽방향에서 정북방향으로 아연과 니켈의 농도가 점진적으로 확산되고 있었으며 제2 주성분(PC2)은 강원광산 중남부지역에서 카드뮴과 수은 함량의 농도가 높게 나타났다. 클러스터 분석결과, D그룹에서 비소와 구리 금속이 공간자기상관관계가 높게 나타났으며 비소의 경우 중금속 농도가 0.83mg/kg로 남에서 북쪽방향으로 증가하였다. 본 연구는 크리깅모델을 이용하여 광산부지로부터 오염토양의 중금속 분포 현황을 공간학적으로 파악할 수 있었고 향후 휴 폐광부지에서 위해성평가 및 정책당국의 결정권자들에게 오염토양 복원에 대한 의사결정시 도움이 될 것이다.

• 자원환경지질
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• 제37권1호
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• pp.21-33
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• 2004

이 연구의 목적은 국내의 휴폐광 금속광산의 중금속 오염을 종합적으로 평가하는 것이다. 그 동안 정부와 지방자치단체 및 개별 연구자에 의해 이루어진 휴폐광 금속광산의 중금속 오염도를 종합적으로 조사한 결과, 주요 오염물질은 광미를 포함한 광산폐기물이었다. 이들로부터 다양한 유독성 물질, 특히 As, Cd, Cu, Pb 및 Zn 등이 바람과 물에 의해 하부 수계로 이동되어 환경문제를 일으키고 있다. 그 결과 많은 광산들 주변에서 다량의 As 및 중금속이 검출되었으며, 일부는 토양환경보전법의 우려기준 및 대책기준을 초과하고 있다. 초과 항목 중에서는 비소의 초과 빈도가 가장 높았으며 그 다음으로 Cd, Cu, Pb, Zn 등의 오염 빈도도 높은 편이었다. 국가에서 지속적인 광해방지사업을 시행함에도 불구하고 아직도 많은 광산에서 오염물질이 배출되고 있는 실정이다. 특히, 다양한 추출법을 적용하여 오염물질의 추출량을 조사한 결과, 광미 및 토양은 지구화학적 특성을 잘 반영하고 있다. 종합적으로 볼 때, 정부주도로 휴폐광산의 관리를 위한 전담기구의 설치가 필요하다.