• 한국지하수토양환경학회지:지하수토양환경
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• 제15권2호
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• pp.1-9
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• 2010

Estimations of porosity and bulk density, particle size analysis of soli samples, tracer test and slug test were performed in a petroleum contaminated area of Kangwon for understanding characteristics of the aquifer. Porosities of the samples were estimated 0.158~0.257, and bulk densities were estimated as $1.73\sim2.10\;g/cm^3$. Majority proportion of the soil samples was 0.5~1.0 mm size. In the soil texture triangle, all samples were distributed at sand area. Uniformity coefficients were estimated as 7.71~10.39, and thus all samples were poorly-sorted. In the tracer test, Darcy velocity was estimated to $4.8\times10^{-6}$ cm/day, effective porosity was 0.175, and longitudinal dispersivity was 0.1 m. According to the slug test, hydraulic conductivities of the test wells were estimated as $2.243\times10^{-2}\sim1.634\times10^{-2}$ cm/sec. These hydrogeologic parameters can be used for efficient remediation design of the petroleum contaminated area.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 추계학술발표회
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• pp.148-151
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• 2003

Soil washing was applied as a supplementary step of soil remediation at a petroleum oil contaminated site. A soil washing system was designed, assembled, and operated at the site. A field screening method with PetroFlagTM was adopted at the site to find the exact boundary of contaminated area as soil excavation progressed and to verify the concentration of treated soil. The system operation showed the cleanup efficiency of 90% at the compatible cost compared to other methods.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 총회 및 춘계학술발표회
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• pp.85-88
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• 2001

Since mountainous area has access restrictions for field work, assessors need to establish a conceptual model of the contamination prior to the field investigation. In this study we established a conceptual model of the contamination based on site inspection and geological survey, followed by the field investigation for the petroleum spill site. In the conceptual model, we estimated that tile contamination should have spread by groundwater and topographical characteristics within the top soil layer. The spread of contamination through rock was not considered in the conceptual model due to impermeable characteristics of metasyenite. The contaminated environmental media of the petroleum spill site include soil and groundwater. According to the analysis result of the contamination, the volume of contaminated soil is estimated approximately 4, 150 cubic meters (7, 055 ton) with most contaminants existing along the groundwater flow within top soil layer.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권5호
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• pp.10-19
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• 2012

The aim of this study was to examine chemical and isotopic compositions of groundwater and lake water near an area contaminated by petroleum and to evaluate influence of petroleum on them during the period from March to August 2011. In dry season, $Ca^{2+}$ and $SO{_4}^{2-}$ were dominant in the groundwater and lake water and $Ca^{2+}$ and $HCO{_3}^-$ were significant in wet season. ${\delta}^{18}O$ and ${\delta}D$ of the groundwater and lake water were plotted near LMWL (${\delta}D=8.06{\delta}^{18}O+12.5$). ${\delta}^{18}O$ and ${\delta}D$ of the lake water did not show seasonal variation. However, ${\delta}^{18}O$ and ${\delta}D$ of the groundwater were enriched in wet season compared with those in dry season because of influence of small ponds around wells where evaporation losses were slightly experienced. Redox condition of most lake water was oxidation environment in contact with the atmosphere during the study period. However, redox condition of groundwater was transitional environment in dry season and oxidation environment in wet season because of influence of contaminant such as petroleum. In some groundwater, the concentrations of $NO{_3}^-$ in some groundwater were less than 1 mg/L because of denitrification. Also, $NO{_3}^-$ showed positive correlation with $SO{_4}^{2-}$ and weak negative correlation with $HCO{_3}^-$, because of influence of denitrification.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
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• pp.179-182
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• 2002

The objective of this study was to evaluate petroleum hydrocarbon degradation processes governing natural attenuation at tile contaminated site and accomplished through conducting on investigation of degradation rate, capacity, and mechanism of the monitored natural attenuation. The monitoring results of the three years indicated that the concentrations of DO, nitrate, and sulfate in the contaminated area were significantly lower than these in the none-contaminated area. The results also showed a higher ferrous iron concentration, a lower redox potential and a neutral pH in the contaminated groundwater, suggesting that biodegradation of TEX is the major on-going process in the contaminated area. However, reduction of TEX in the groundwater was not only biodegradation but also dilution and reaeration during infiltration of uncotaminated surface and groudwater.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권3호
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• pp.32-38
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• 2012

This study was conducted to evaluate the slurping process affecting the variation of free product and VOCs concentration and the bioaugmentation effect on bioremediation process. Free products and soil gas were extracted from 30 extraction wells installed in a petroleum contaminated area. The extraction system was operated for 10 hours per day with 1 hour on-and-off mode. The thickness of free product in extraction well was decreased from 11.7 cm to 4.5 cm and the VOCs concentration was increased from 10.37 ppm to 30.78 ppm during the operation period. After the slurping process for 2 months, contaminated soil was treated with bioremediation process in 2 cells, $15{\times}40$ m, biologically enhanced with adjusting oxygen, moisture and nutrients concentration. Total 1,400 L of microbial inoculant, Naturesys. (Dong Myung Ent. Co.) was added to the pile B, which has an outstanding ability for degrading petroleum hydrocarbons. The results showed that bioremediaton effect in soil with the microorganisms solution is 33% higher than that in soil with only residual bacteria.

• 한국지하수토양환경학회지:지하수토양환경
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• 제9권3호
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• pp.38-48
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• 2004

TEX농도의 지속적인 감소 및 비오염지역에 비해 오염지역에서 용존산소(DO), 질산염(NO$^{3-}$ ), 황산염(SO$_4$$^{2-}$ )농도의 뚜렷한 감소와 2가철($Fe^{2+}$)농도의 증가, 산화환원전위의 현저한 저하, pH중성 등의 지화학적 인자의 분포특성으로 미루어 보아 대상부지는 혐기성 상태에서 토착미생물에 의한 오염물질의 생분해가 이루어지고 있는 것으로 판단되며, 또한 이와 함께 투수성이 큰 현장부지의 지질학적 특성상 강우에 의한 지하수의 재유입으로 인한 희석 및 분산도 TEX농도의 감소에 부수적인 요인이 되었을 것으로 추정된다. 한편, 연구대상부지에서의 생분해능(EAC)은 9.04∼35.85 mg/L범위에 있으며, 평균 24.73 mg/L이었다. 그리고 연구대상부지에서 생분해에 가장 큰 영향을 주는 생분해과정으로는 황산염환원으로 기여도가 약 75%정도인 것으로 나타났으며, 다음으로는 질산염환원 그리고 산화철(3가철)환원의 순으로 나타났다. 연구대상부지의 생분해능(EAC)를 기초로 년간 분해할 수 있는 TEX의 양을 계산해 보면 121∼45.3kg/year이며, 이 값은 년간 TEX의 지하수 부하량의 약 80%정도에 해당하는 것이다. 현장부지에서의 계산된 전체 자연저감율은 0.0017∼0.0224day$^{-1}$(평균 0.0110day$^{-1}$)이며, 1차 생분해율은 0.0008∼0.0106day$^{-1}$(평균 0.0051day$^{-1}$)이었다. 1차 생분해율에 근거한 연구대상부지에서 TEX의 반감기는 866.25∼65.38일(2.37∼0.18 years)로 계산되었다.

• 기술사
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• 제41권3호
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• pp.35-39
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• 2008

The most common soil contaminants are petroleum-based. Hydrocarbons from diesel fuel and gasoline are widespread problems, as are total petroleum hydrocarbon(TPH). There are two distinct classes of soil remediation: in-situ, or on-site, and ex-situ, or off- site. On-site cleanups are often preferred because they are cheaper. On the other hand, excavating a contaminated area and transporting it to a remote site before cleaning it can often be more complete. Ex-situ remediation also has the added bonus of taking the bulk of contaminants off-site before they can spread further. In addition, in-situ situations are limited because only the topside of the soil is accessible.

• 한국지하수토양환경학회지:지하수토양환경
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• 제18권5호
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• pp.7-14
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• 2013

The objectives of this study were to identify the characteristics of groundwater in the petroleum contaminated site and to evaluate the applicability of house-type landfarm facilities heated with briquette stoves in winter season. The six monitoring wells were installed at the site where pH, dissolved oxygen, and temperature were all measured. Also groundwater contaminants, benzene, toluene, ethylbenzene, xylene and total petroleum hydrocarbon, were analyzed twice. House-type two landfarm facilities ($12m{\times}40m{\times}4.8m$) each installed with four briquette stoves were constructed. During four rounds treatment process, VOCs, moisture, temperature were monitored and soil contaminants were analyzed. The pH was 6.37 and considered subacid and DO was measured to be 3.12 mg/L. The temperature of groundwater was measured to be $9.48^{\circ}C$. The groundwater contaminants were detected only in the monitoring wells within the contaminated area or close to it showing that the groundwater contaminated area was similar to the soil contaminated area. During the landfarm process, 73.3% of VOCs concentration in interior gas was decreased and moisture was lowered from 17.7% to 13.4%. In the morning, at 8:00 am, the temperature was decreased showing soil ($5.5^{\circ}C$) > interior ($4.8^{\circ}C$) > exterior ($3.5^{\circ}C$). In the afternoon, at 2:00 pm, the temperature was soil ($8.6^{\circ}C$) < interior ($9.9^{\circ}C$) < exterior ($11.5^{\circ}C$) with solar radiation. The temperature difference between interior and exterior was $0.7^{\circ}C$ in the morning, but it was $1.6^{\circ}C$ in the afternoon. A total of 130 days were taken for four round landfarm processes. Each process was completed within 33 days showing 80% of cleanup efficiency ($1^{st}$ order dissipation rate(k) = 0.1771).

• 한국재난정보학회 논문집
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• 제14권2호
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• pp.141-153
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• 2018

연구목적 : 본 연구 대상부지는 1973년에 해안매립이 완료되어 30여 년 동안 선박 수선업 등의 사업활동이 진행되어 왔다. 연구방법 : 2013년에 실시한 토양정밀조사결과, 대상부지의 오염면적은 $10,000m^2$, 오염심도는 GL(-) 3.0 m의 고농도 TPH로 유류오염이 확인되었고, 시간경과에 따라 오염범위가 확산되고 있었다. 연구결과 : 정제된 석유제품에 의한 토양오염은 종종 생태계와 인간의 건강에 해로운 영향을 미치기 때문에 신속한 정화가 이루어져야 한다. 결론 : 따라서 고농도의 TPH로 오염된 대상 부지에 대하여 수리지질학적 조사를 통해 지하수유동과 오염의 확산방향을 평가함으로써 잠정적인 오염원인자를 추정할 수 있다.