• Journal of Soil and Groundwater Environment
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• v.7 no.4
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• pp.3-9
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• 2002

In this study, electrokinetic remediation tests were performed with spiked fine-grained soil by phenanthrene which is representative hydrophobic organic contaminant of petroleum hydrocarbon. And also, the enhanced method was used with surfactant concentration variation and elapsed time to achieve more higher removal efficiency than conventional electrokinetic treatment. In conventional electrokinetic treatment, most phenanthrene was not transported. But, in the enhanced method used by the surfactant, phenanthrene moved form anode to cathode region and accumulated in cathode region. Also, the transportation rate of phenanthrene was increased with surfactant concentration increasement and elapsed time.

• Proceedings of the Korean Geotechical Society Conference
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• 2003.03a
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• pp.185-188
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• 2003

오염된 지하수 정화에 있어 반응벽체(Permeable Reactive Barriers, PRBs)를 이용한 정화기법은 최근 가장 큰 관심을 모으고 있는 기술이다. 반응벽체의 적용에 있어 가장 중요한 사항은 오염물질의 특성을 고려하여 적절한 반응성을 가지는 충진물질을 선택하는 일이다. 지금까지 연구된 반응물질 중 제올라이트는 취득이 용이하고 가격이 저렴하여, 암모늄이나 중금속과 같은 양이온성 오염물질의 정화에 그 적용성을 인정받아왔다. 하지만 표면에 음전하를 띠는 제올라이트의 특성 때문에, 지하수내에서 음이온의 형태로 존재하는 Cr(VI) 등에는 반응성이 없는 것으로 알려져 왔다. 이에 본 연구에서는 제올라이트에 영가철을 결합한 ZanF란 물질을 개발하여 양이온성 중금속의 하나인 납과 음이온성 중금속의 하나인 Cr(VI)을 동시 제거하는 실험을 수행하였다. 실험결과 ZanF는 초기농도 2-15mmol를 가지는 납 오염용액에 대해 90% 이상의 제거율을 보였으며, 초기농도 0.1 mmol을 가지는 Cr(VI) 오염용액의 농도를 5시간 내에 검출한계 이하로 떨어뜨리는 탁월한 효과를 보였다. 실험결과를 토대로 ZanF는 납과 Cr(VI)으로 동시에 오염된 지하수 정화에 효과적으로 사용될 수 있으리라 기대된다.

• Microbiology and Biotechnology Letters
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• v.48 no.2
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• pp.99-112
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• 2020

Rhizoremediation, based on the ecological synergism between plant and rhizosphere microorganisms, is an environmentally friendly method for the remediation of petroleum hydrocarbon-contaminated soils. In order to mitigate global climate change, it is necessary to minimize greenhouse gas emissions while cleaning-up contaminated soils. In rhizoremediation, the main factors affecting pollutant remediation efficiency and greenhouse gas emissions include not only pollutant and soil physicochemical properties, but also plant-microbe interactions, microbial activity, and addition of amendments. This review summarizes the development in rhizoremediation technology for purifying oil-contaminated soils. In addition, the key parameters and strategies required for rhizoremediation to mitigate climate change mediation are discussed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.3
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• pp.885-893
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• 2014

This research reports the enhanced Electrokinetic (EK) with $H_2O_2$ and sodium dodecyl surfate (SDS), which are commonly used in Fenton oxidation and soil flushing method, in order to remediate soil contaminated with heavy metals and Total Petroleum Hydrocarbons (TPH) simultaneously. In addition, influences of property of soil and concentration of chemical solution were investigated through experiments of different types of soils and varying concentration of chemical reagents. The results indicated, in the experiments using artificially contaminated soil, the highest removal efficiency of heavy metals using 10% $H_2O_2$ and 20mM SDS as electrolytes. However, in the experiments using Yong-San soils (study area), remediation efficiency of heavy metals was decreased because high acid buffering capacity. Through experiment of 20% $H_2O_2$ and 40mM SDS, increased electric current influences the remediation of heavy metals due to decrease in the soil pH. In the experiments of Yong-San soils, the remediation efficiency of TPH was decreased compared with artificially spiked soils because high acid buffering capacity and organic carbon contents. Furthermore, the scavenger effect of SDS influenced TPH oxidation efficiency under the conditions of injected 40mM SDS in the soils. Therefore, the property of soil and concentration of chemical reagents cause the electroosmotic flow, soil pH, remediation efficiency of heavy metals and TPH.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.36 no.5
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• pp.839-846
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• 2016

Since oil leakage is one of the most common nonpoint pollution sources that contaminate soil in Korea, the capacity of soil microbial community for degrading petroleum hydrocarbons should be considered to assess the functional value of soil resource. However, conventional methods (e.g., microcosm experiments) to assess the remediation capacity of soil microbial community are costly and time-consuming to cover large area. The present study suggests a new approach to assess the toluene remediation capacity of soil microbial community using a microbial diversity index, which is a simpler detection method than measuring degradation rate. The results showed that Shannon index of microbial community were correlated with specific degradation rate ($V_{max}$), a degradation factor. Subsequently, a correlation equation was generated and applied to Michaelis-Menten kinetics. These results will be useful to conveniently assess the remediation capacity of soil microbial community and can be widely applied to diverse engineering fields including environment-friendly construction engineering fields.

• 농업기술회보
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• v.48 no.4
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• pp.27-29
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• 2011

• Journal of the Korean GEO-environmental Society
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• v.15 no.3
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• pp.15-19
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• 2014

Spilling pollutants and its contamination to the ground have serious impact to public resulting in various research about remediation techniques. In this study, the use of amphiphilic block copolymer for remediation was investigated with a series of laboratory tests on removal of hydrophobic contaminant in soil. Four types of amphiphilic block copolymer were developed and the efficiency of the cleaning was compared with surfactant using arbitrary diesel-contaminated soils. The results of the study show that the use of amphiphilic polymer in the soil washing process significantly enhanced the remediation of the contaminated soil and a potential of new methodology of eco-friendly remediation.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09a
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• pp.1239-1244
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• 2010

중금속 및 유류 오염토양 정화를 위해 효율적인 토양세척법과 공정 선정을 목적으로 최적의 오염정화 설계인자를 제시하기 위한 실험적 연구를 수행하였다. 실험분석 항목은 구리, 납, 아연을 포함하는 중금속항목과 총석유계탄화수소(TPH)인 유류항목에 대해 흡광광도법(absorptiometric analysis), 기체 크로마토그래피(gas chromatography)법을 이용하여 단계별로 분석하였다. 실험방법은 최적 세척용매 결정시험, 최적 세척시간 도출시험, 최적 진탕비(S/W ratio) 결정시험 등을 통해 얻어진 결과를 토대로 계면활성제 첨가량별 중금속 용출영향 분석시험 순으로 실시하였다. 실험결과 세척용매인 염산 0.1mole, 체류시간 1시간, 진탕비 1:3 조건에서 오염물질의 저감효과가 우수하게 나타났으며, 이들 조건을 적용하였을 때 1%의 계면활성제를 세척용매에 첨가하였을 경우 추가적인 오염물질의 농도 저감효과가 있는 것으로 분석되었다.

• Journal of the Korean GEO-environmental Society
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• v.17 no.10
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• pp.63-71
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• 2016

Soil filling or replacement are routinely applied for soil restoration of domestic asbestos waste contaminated areas. However, since these soil recovery methods could not fundamentally solve the asbestos contamination, number of research on new alternative technologies have been carried. In this study, comprehensive laboratory test results utilizing wind power apparatus are used to design wind power purification device that can be applied in practice. Preliminary tests were carried out with wollastonite or actual asbestos waste contamination soils to study purification efficiency. Asbestos content measured immediately after in-situ test on asbestos-contaminated soil satisfying for purification standard showing less than 0.25% asbestos content from all tests, hence, analyzed to ensure over 90% of clean soil recovery rate and considered to be excellent applicability of future asbestos-contaminated soil purification.

• Journal of Soil and Groundwater Environment
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• v.25 no.3
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• pp.32-42
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• 2020

오염부지 관리 기조가 매체 중심에서 수용체 중심으로 변화하면서 우리나라에 위해성평가 제도가 도입되었으나, 이를 오염현장에 충분히 활용하기 위한 체계와 관련 기술들은 아직 제대로 확립되어 있지 않다. 특히, 여러 가지 이유로 정화곤란부지로 분류가 되는 오염부지의 정화 및 관리와 그러한 부지에 적용될 수 있는 위해저감기술들에 대한 기술적, 사회적 논의와 합의도 부족한 실정이다. 본 연구에서는 그동안 오염토양의 정화에만 초점이 맞추어진 우리나라의 토양환경정책이 오염부지의 관점에서 그와 연결된 수용체를 보호하는 방향으로 나아가기 위해 필요한 위해성기반 오염 부지관리 의사결정체계를 제안하고, 그러한 관리체계가 현장에서 적절히 적용되도록 하기 위해 필요한 위해저감기술들을 조사, 분류하여 위해저감 방식에 따른 위해저감기술의 활용성 및 적용성을 평가하는 방안을 제안하였다.