• Title/Summary/Keyword: Soil and groundwater

Search Result 3,591, Processing Time 0.032 seconds

Analytical Method of Polycyclic Aromatic Hydrocarbons (PAHs) in Petroleum Contaminated Soils - Focused on the 16 US EPA Priority PAHs (유류오염토양 중 다환방향족탄화수소류(PAHs) 분석방법 연구 - US EPA 16종 PAHs를 중심으로)

  • Kim, Ji Young;Kim, Dongho;Kim, Tae Seung;Han, Jin-Suk;Lee, Jai-Young;Noh, Hoe-Jung
    • Journal of Soil and Groundwater Environment
    • /
    • v.17 no.5
    • /
    • pp.20-30
    • /
    • 2012
  • In case of analyzing PAHs (EPA 16 compounds) in oil-contaminated soils, the lump of peaks may occur because of the aliphatic and polar compounds in oil. This phenomenon is due to the lower accuracy of the analysis. To solve this problem, evaluation of application of silicagel-alumina multi-layer fraction was performed using standard substances and oil-contaminated soils. As a result of application of silicagel-alumina multi-layer fraction cleanup method using standard substances, recovery rates of surrogate standards (5 compounds including Naphthalene-d8) were 83~100% and those of target standards were 75~129%. These were to meet the target values (60~130%) in this study. When used 4% water-silicagel column analyze PAHs in oil-contaminated soils, Some problems were generated for quantitative analysis of PAHs; concentration of PAHs was underestimated due to an upward baseline of internal standard (recovery rate: less than 60%) and overestimated by the lump of peaks which were not purified (the biggest recovery rate: more than 400%). On the other hand, in case of silicagel-alumina multi-layer fraction cleanup method, recovery rate of surrogate standards were 61~101.6%. Therefore this cleanup method was considered a valid method to improve accuracy of analysis of PAHs in oil-contaminated soils.

수리지질학적 조건에 따른 지하수유동 및 오염물질이동 영향연구

  • 이진용;이강근
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • 2002.09a
    • /
    • pp.280-282
    • /
    • 2002
  • In analysis of pumping test data, generally infinite domain has been assumed. However, in many cases, this assumption was not readily satisfied. Some boundaries conditions and natural heterogeneity of hydrogeologic properties would play critical roles on groundwater flow and contaminant transport. This study examined effects of some boundary conditions and heterogeneity on the groundwater flow and contaminant transport with basic numerical groundwater modeling, which provides implications for remediation of contaminated groundwater.

  • PDF

전주-완주, 곡성 지역의 지하수 수위 변동 특성

  • 조민조;하규철;이명재;이진용;이강근
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • 2002.04a
    • /
    • pp.213-216
    • /
    • 2002
  • To investigate the conditions of groundwater resources in Jeonju, Wanju, and Goksung areas, a basic groundwater survey was performed. From the survey, various useful informations such as groundwater use, waterlevel distribution, water chemistry were obtained. This study focused on the analysis of the water levels, which were automatically monitored with pressure transducers or manually measured. The monitorings were conducted for both shallow wells completed in alluvial aquifers and deep wells in bedrock aquifers. This study presents results of the investigation.

  • PDF

유류오염대수층에서 고온 공기분사공정법을 통한 TPH, VOCs, $CO_2$ 변화에 관한 특성인자 연구

  • Lee Jun-Ho;Park Gap-Seong
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • 2005.04a
    • /
    • pp.232-236
    • /
    • 2005
  • In-situ Air Sparging (IAS, AS) is a groundwater remediation technique, in which organic contaminants are volatilized into air as it rises from saturated to vadose soil zone. The purpose of this study was to investigate the effect of environmental conditions on the degradation of VOCs (Volatile Organic Compounds) and $CO_2$ in the unsaturated zone and TPH (Total Petroleum Hydrocarbons) in saturated zone of sandy loam. In the laboratory, diesel (10,000 mg TPH/kg)-contaminated saturated soil. After heating the soil for 36 days, the equilibrium temperature of soil reached to $34.9{\pm}2.7^{\circ}C$ and TPH concentration was reduced to 78.9% of the initial value, Volatilization loss of VOCs in TPH was about 2%, The reduction gradient of $CO_2$ concentration was 0.018/day in air space and 0.0007/day in unsaturated zone.

  • PDF

Remediation of groundwater contaminated with MTBE using micellar solubilization

  • 백기태;조현정;양지원
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • 2001.09a
    • /
    • pp.151-154
    • /
    • 2001
  • To assess the remediation possibility of groundwater contaminated with MTBE, micellar solubilization by various surfactants was evaluated. Micellar solubilization is basic phenomena to apply micellar enhanced ultrafiltration for groundwater remediation contaminated with MTBE. Sodium dodecyl sulfate (SDS) shows the best removal efficiency among various nonionic, cationic and anionic surfactants. Molar ratio of SDS to MTBE was the most important factor for removal of MTBE using micellar solubilization. With the ratio of more than 13, the removal efficiency was saturated to 55%.

  • PDF

A Study of Interference Factor of Analysis Method of Hexavalent Chromium in Soil using UV/VIS Spectrometry and Application of Ion Chromatography (자외선/가시선 분광법을 이용한 토양 중 6가 크롬 분석방법의 방해요인 분석 및 이온크로마토그래피 적용에 관한 연구)

  • Noh, Hoe-Jung;Lee, Myung-Gyu;Lee, Hyeon Seok;Kim, Mira;Kim, Dongho;Kim, Tae Seung
    • Journal of Soil and Groundwater Environment
    • /
    • v.17 no.6
    • /
    • pp.33-42
    • /
    • 2012
  • This study was performed to find the problems according to interference factors (organic matter, pH, Cr, Mn, Fe, clay, and etc.) when we analyzed the hexavalent chromium [Cr(VI)] in soils using UV/VIS spectrometer (US EPA 7196A), attempted to evaluate the domestic applicability of analytical method (US EPA 7199) using IC-UV/VIS spectrometer as alternative method. The recovery rate of certified reference materials was 75.0% (US EPA 7196A) and 101.4% (US EPA 7199) by the analytical methods. As the results of performing QA/QC about US EPA 7199, method detection limit (MDL) and limit of quantification (LOQ) were 0.062 mg/kg, 0.196 mg/kg, respectively. The LOQ of US EPA 7199 was lower than that of the current soil official testing method in Korea (0.5 mg/kg). Cr(VI) contents in 23 soil samples were compared by the analytical methods of EPA 7196A and 7199. Cr(VI) was detected in 13 of 23 soil samples by EPA 7196A, while EPA 7199 was not detected in any soil samples. The Cr(VI) content in 23 soil samples by EPA 7196A was not clearly correlated with Cr, Fe, Mn and clay content in the soil samples. However, the contents of Cr(VI) and organic matter of the soil samples had the highest coefficient of determination ($R^2$) of 0.80. In order to evaluate the correlation between the recovery rates of Cr(VI) and organic matter contents in the soil samples, the recovery rates of 5 soil samples added Cr(VI) standard solution were analyzed by the analytical methods. According to the results, the higher the organic matter contents in soil samples, the lower the recovery rates of Cr(VI) by US EPA 7196, while in case of US EPA 7199, the recovery rates were stable regardless of the organic matter contents.

Evaluation of the Effect of Pump and Fertilize on Nitrate Reduction in Groundwater (지하수 관개 시비의 지하수 내 질산성질소 저감 효과 평가)

  • Yuhoon Yeum;Young Kim;Moon-su Kim;Sunhwa Park;Kyungjin Han
    • Journal of Soil and Groundwater Environment
    • /
    • v.29 no.1
    • /
    • pp.18-27
    • /
    • 2024
  • In this study, the pump and fertilize (PAF) was applied to reduce nitrogen infiltration into groundwater at three corn cultivation sites over a three-year period, and its effectiveness was evaluated. PAF involves pumping nitrate-contaminated groundwater and using it for irrigation, thereby replacing the need for chemical fertilizers. This method not only substitutes chemical fertilization, but also reduces nitrogen infiltration into groundwater through root zone consumption. To confirm PAF's effectiveness, an equal amount of nitrogen was applied in each cultivation plot, either through chemical fertilizer or irrigation with nitrate-contaminated groundwater. Regular monitoring of infiltrating pore water and groundwater was conducted in each cultivation plot. The linear regression slope for nitrate concentration in the pore water after repeated application of PAF ranged from -3.527 to -8.3485 mg-N/L/yr, confirming that PAF can reduce nitrate concentration in the pore water. With an increasing proportion of PAF, the infiltrating nitrate mass in pore water was reduced by 42% compared to plots fertilized with chemical fertilizer. Additionally, the linear regression slope of nitrate concentration in groundwater was calculated as -2.2999 and -9.2456 mg-N/L/yr. Therefore, continuous application of PAF in rural areas is expected to significantly contribute to reducing nitrate concentration in groundwater.

Investigation of Soil and Groundwater Contaminated by Gasoline and Lubricants Around a Railroad Station in S City, Korea

  • Lee, Hwan;Lee, Yoonjin
    • Journal of Environmental Health Sciences
    • /
    • v.38 no.6
    • /
    • pp.529-540
    • /
    • 2012
  • Objective: This research was performed to evaluate the state of oil pollution in an area surrounding a railway station that has over 100 years of business history as a railway station in S City, Korea. The amount of polluted soil was estimated, and the target area for remediation was assessed in this study to restore the oil-polluted area. Methods: To accomplish this aim, five observation wells were installed for the sampling of groundwater, and soil was sampled at 33 points. Electric resistance studies and a trench investigation were undertaken to understand the geological conditions of the site, and the groundwater movement in this area was simulated by MODFLOW. Physiochemical analyses were conducted to determine the quality of the groundwater and the current state of oil pollution influenced by that of the soil. Results: The mean level of total petroleum hydrocarbons (TPHs) in this area was 1,059 mg/kg, and the area for remediation was determined to be 7,610 mg/kg. Levels of benzene, toluene, ethylbenzene, and xylene (BTEX) were determined to be under the legal standard. Conclusion: In terms of depth, the biggest area polluted by TPH found was between 0 and 1 m from ground level, and the affected area was 5,900 $m^3$. TPHs were not detected in groundwater. Diesel and lubricating oil were the main causes of TPH pollution at this railway station.

A Pilot Study for Remediation of Groundwater by Surfactant -Enhanced Soil Flushing

  • Park, Jong Oh;Lee, Dal-Heui
    • Journal of Soil and Groundwater Environment
    • /
    • v.21 no.5
    • /
    • pp.1-7
    • /
    • 2016
  • The removal of non-aqueous phase liquids (NAPLs) from groundwater using pure water, via pump and treat, is quite ineffective due to their low solubility and hydrophobicity. Therefore, the objectives of pilot tests were to select potentially suitable surfactants that solubilize tetrachloroethylene (PCE) and trichloroethylene (TCE) present as contaminants and to evaluate the optimal range of process parameters that can increase the removal efficiency in surfactant-enhanced soil flushing (SESF). Used experimental method for surfactant selection was batch experiments. The surfactant solution parameters for SESF pilot tests were surfactant solution concentration, surfactant solution pH, and the flow rate of surfactant solution in the SESF pilot system. Based on the batch experiments for surfactant selection, DOSL (an anionic surfactant) was selected as a suitable surfactant that solubilizes PCE and TCE present as contaminants. The highest recovery (95%) of the contaminants was obtained using a DOSL surfactant in the batch experiments. The pilot test results revealed that the optimum conditions were achieved with a surfactant solution concentration of 4% (v/v), a surfactant solution pH of 7.5, and a flow rate of 30 L/min of surfactant solution (Lee and Woo, 2015). The maximum removal of contaminants (89%) was obtained when optimum conditions were simultaneously met in pilot-scale SESF operations. These results confirm the viability of SESF for treating PCE and TCE-contaminated groundwater.