• 자원환경지질
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• 제32권5호
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• pp.485-493
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• 1999

In order to dermine the degree of contamination for the Ilgok landfill site, stream water, groundwater and stream sediment samples were collected in 1998 and 1999, and analyzed for physico-chemical properties. The stream water contains significanr concentrations of TDS $HCO_3^-$and $NO_3^-$, and ground-water is polluted by $NO_3^-$ up to the drinking water standard from landfill leachate. From the point of the horizontal movement of elements, stream water IL-2 at the conjunction point with landfill leachate reached the most high concentrations of $HCO_3^-,Cl^-,Na^+, K^+, NO_3^-,Mg{^2+}$ and $SO_4^{2-}$stream water Il-3 shows the high concentrations of $Ca^{2+}, Pb^{2+}$ and $Mg^{2+}$. The optimum contamination indicator of Ilgok landfill site is $HCO_3^-, C^l-, Na^+, Mn^{2+}$ and TDS from the calculation of contamination factor.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 총회 및 춘계학술발표회
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• pp.128-131
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• 2001

We evaluated natural attenuation of petroleum hydrocarbons in a shallow aquifer using a modeling study. The studied shallow aquifer was severely contaminated with petroleum hydrocarbons, especially toluene, ethylbenzene and xylenes (i.e, TEX). The exact spill history was not known. Therefor we used a contaminant level in May 1999 (the first sampling date of our integrated study) as an initial contaminant concentration. we calibrated required transport parameters using the contamination levels obtained from groundwater analyses in September of 1999. For fate and transport of the petroleum contaminants, five case 2 with sorption and degradation. case 3 with sorption and degradation (half decay constant compared with case 2), case 4 with degradation but no sorption, and case 5 with sorption but no degradation. For sorption and degradation, a linear sorption isotherm and first order irreversible decay was assumed, respectively and no additional contamination source to groundwater is also assumed.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.90-93
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• 2003

Sampling of waters from each stage of treatment system, SAPS (Successive Alkalinity Producing System), and spring water near the Hanchang coal mine of Kangwon. Province were carried out periodically and analyzed to evaluate the source and possible path of groundwater contamination by acid mine drainage(AMD). Chemical and sulfur isotope compositions showed that spring water was affected by seepage from mine tailings, and seepage of stonewall, a part of treatment system, was affected by both seepage from mine tailings and mine adit drainage. Through the treatment system no appreciable decrease of sulfur content was identified. And almost similar sulfur isotope compositions of water from each stage of the treatment system may suggest incomplete or very poor sulfate reduction by sulfate reducing bacteria.

• 자원환경지질
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• 제34권5호
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• pp.485-498
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• 2001

본 연구는 제주도 남서부의 대정수역 30개의 우물에 대하여 지하수 수질의 주기적 관측을 통하여 이 지역의 지하수 수질과 오염의 시공간적 변화 특성을 규명하고자 실시되었다. 수질 분석은 주 양.음이온 및 산소-수소-질소 등위 원소에 대하여 이루어졌다. 연구지역의 지하수 수질은 Na(Mg)-HCO3 유형이 우세하며, 국지적으로는 Ca-HCO$_3$, NaCl 유형 등도 나타난다. 지하수 시료의 주 이온함량 린 EC 값의 변화, 질산성질소와 염소이온과의 상관관계 등으로 부터 지하수 수질의 시공간적 변화는 국지적으로 발달된 지하수 유동경로의 변화, 강우의 함양과 이에 따른 지표오염 물질의 유입, 해안지역에서의 해수침투 등에 의해 복합적으로 영향을 받고 있는 것으로 해석된다. 질산성질소에 의한 오염도의 변화는 강우의 함양사건에 직접적으로 관계된다. 질간성질소의 월별 농도를 보면, 정도의 타이는 있으나 강우 후 2~8배의 농도 증가를 보이고 있다. 지하수의 산소 . 수소 동위원소비는 시기별로 채취된 피하수가 서로 다른 강우로부터 기인하였음을 지시한다. 질소 동위원소 자료를 사용하여 지하수의 질산성질소 오염원을 정성적으로 추분하고, 공간적인 오염 영향범위를 평가하였다. 축산폐수의 영향을 받은 것으로 사료되는 지역에서는 상대적으로 NO$_3$-N농도가 높고 $\delta$$^{15}$ N의 값도 5$\textperthousand$ 이상으로 나타난다. 동남부의 농작지역에서는 NO$_3$-N 농도는 논으나 $\delta$$^{15}$ N의 값은 5$\textperthousand$ 이하로 나타난다. 지하수의 지속적인 수질관측 자초는 지하수 함양과 이에 따른 지표오염물직의 유입에 의한 지하수 오염현상을 시 .공간적으로 평가하고 예측하는데 중요한 요소로 활용할 수 있다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1997년도 총회 및 춘계 학술발표회 논문집
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• pp.87-91
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• 1997

• Environmental Engineering Research
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• 제23권1호
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• pp.84-91
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• 2018

The present study deals with the management of groundwater resources of an important agriculture track of north-western part of Saudi Arabia. Due to strategic importance of the area efforts have been made to estimate aquifer proneness to attenuate contamination. This includes determining hydrodynamic behavior of the groundwater system. The important parameters of any vulnerability model are geological formations in the region, depth to water levels, soil, rainfall, topography, vadose zone, the drainage network and hydraulic conductivity, land use, hydrochemical data, water discharge, etc. All these parameters have greater control and helps determining response of groundwater system to a possible contaminant threat. A widely used DRASTIC model helps integrate these data layers to estimate vulnerability indices using GIS environment. DRASTIC parameters were assigned appropriate ratings depending upon existing data range and a constant weight factor. Further, land-use pattern map of study area was integrated with vulnerability map to produce pollution risk map. A comparison of DRASTIC model was done with GOD and AVI vulnerability models. Model validation was done with $NO_3$, $SO_4$ and Cl concentrations. These maps help to assess the zones of potential risk of contamination to the groundwater resources.

• 한국지하수토양환경학회지:지하수토양환경
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• 제26권6호
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• pp.82-94
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• 2021

Facilities for low impact development (LID) or groundwater recharge have the high potential spreading groundwater nitrate contamination because of the rapid infiltration. This study was initiated to remove nitrate from the waters using agricultural byproducts as organic sources for denitrification during infiltration. As the first step of this purpose, we experimentally tested the denitrifying efficiency of 4 organic materials (pine tree woodchips, cherry leaves, rice straws, and rice hulls) and tried to identify the key factors controlling the efficiency. For this study, we precisely investigated the change of chemical reactions during the experiment by analyzing various geochemical parameters. The result shows that the denitrification efficiency is not simply linked to the availability of the easily decomposable contents in the organic matter. It is found that avoiding the severe pH decrease due to the CO₂ generation is the essence to derive the efficient denitrifying conditions when organic matters were used.

• 대한지하수환경학회지
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• 제7권1호
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• pp.1-7
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• 2000

김포매립지 내의 침출수의 누출에 의한 매립지 주변의 지하수오염을 감소시키기 위해, 매립지 내부에 5조의 수평방사형 수집정(Radial Collector Well Laterals(RCWL))을 설치하는 방법, 응축수 배제정을 이용하는 방법, 매립지의 주변에 차수벽을 2층까지 설치하고 매립지 내부에 22조의 RCWL을 설치하는 방법, 그리고 매립지 둘레에 차수벽을 3층까지 설치하고 매립지 내부에 40조의 RCWL을 설치하는 방법 등을 연구했다. 이를 위해, 수리파라미터를 측정하고, MODFLOW과 MT3D 모델을 사용하여, 김포매립지주변의 지하수 이동과 오염물질 이동체계를 분석했다. 분석결과 차수벽을 2층까지 그리고 2조의 RCWL을 설치하는 방법이 지하수 오염농도를 먹는물 수질기준까지 감소시킬 수 있는 가장 경제적인 방법으로 평가되었다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 임시총회 및 추계학술발표회
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• pp.377-380
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• 2004

To identify the effect of landfill waste for groundwater and unsaturated air environment, soil gas survey and hydrogeochemical study were executed. The geology of the study area is granite and aquifer is mainly composed of sandy soil. The results of spatial distribution from soil gas showed the boundary of buried waste and processes and degree of waste decomposition. Groundwater contamination by leachate from landfill is controlled by groundwater flow attributed by the original topography and liner.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.24-27
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• 2002

The optimal designs of groundwater problems of contaminant containment and cleanup using linear programming and genetic algorithm are provided. In the containment problem, genetic algorithm shows the superior feature to linear programming. In cleanup problem, genetic algorithm makes reasonable optimal design. Un this study, it is demonstrated through numerical experiments that genetic algorithm can be applied to remedial designs of groundwater problems.