• Journal of Soil and Groundwater Environment
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• v.6 no.2
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• pp.57-67
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• 2001

The purpose of this study is to predict appropriate leachate rates and leachate transport velocity through weathered zone and basement rock on the transient condition at Nanji waste landfill. The leachate transport in the Nanji waste landfill is analyzed using MODFLOW(A Modular 3-D Finite Different Groundwater Flow Model) model which simulates three dimension groundwater flow and MT3D(A Modular Three Dimentional Transport Model) model which describes three dimensional transport for advection, dispersion and chemical reaction of dissolved constituents in groundwater system on the transient condition. Leachate production rates are estimated by HELP(Hydraulical Evaluation of Landfill Performance) model and used weather records for recent 10 years. Leachate transport is predicted by a change of leachate level to after/before established HDPE, established slurry wall and wells.

• Journal of Animal Environmental Science
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• v.16 no.3
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• pp.215-226
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• 2010

The pig slurry leachate was dark brown-colored solution that leaches out of woodchip trickling filter. The purpose of this research was to investigate the effect of pig slurry leachate and byproduct on growth characteristics of leaf lettuce in hydroponics culture. The effects of addition of fish meal, bone meal and crab shell for the growth of leaf lettuce were investigated. Leaf lettuce were grown in each of six combination treatment solutions; slurry leachate, slurry leachate + fish meal, slurry leachate+bone meal, slurry leachate + crab shell and chemical hydroponic solution for lettuce based on EC content. The chemical nutrient solution was the solution of National Horticulture Research Station for the growth of lettuce. The all of nutrient solution was adjusted 1.5 mS/cm in EC in hydroponics culture. 1. The pH level of leachate of trickling filter was increased and EC decreased gradually during treatment. Pig slurry leachate was low in suspended solids (SS), phosphorus (P), but rich in potassium (K). 2. The plot of slurry leachate (SL) was lowest in the growth characteristics of lettuce. The leaf length and width of lettuce treated with mixture plot of slurry leachate and fish meal (SL + FM) was higher compared with plot in slurry leachate. The chlorophyll reading was reduced in plot treated with slurry leachate, but that in plot of SL+FM was similar compared with control plot. 3. The fresh weight of lettuce showed lowest in the plot treated with slurry leachate. The addition of fish meal increased the yield of comparing plot of slurry leachate, but plots of bone meal and crab shell addition were not significantly difference. The fresh weight of leaf lettuce in plot of SL+FM was 87% as 400.0g compared with control. In conclusion, the mixture solution of pig slurry leachate and fish meal could be used as a nutrition solution of organic lettuce hydroponics.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.09a
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• pp.532-535
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• 2003

새만금 방조제를 통하여 새만금호로 유입되는 해수 침출수량과 새만금 방조제 내부에서의 해수와 담수 사이의 상호작용 등에 대한 연구를 수행하였다. 본 연구에는, 밀도 차이에 의한 흐름을 고려한 지하수 흐름 지배 방정식과 염류의 분산 및 이송 지배 방정식을 결합시킨 수치해석 모델이 이용되었다. 밀도류를 고려한 경우에는 밀도류를 고려하지 않았을 경우보다 해수 침출량은 다르지 않았으나, 해수 침출면의 길이가 축소되고 유속이 증가하였다. 부정류상태의 해수-담수 경계면은 정류 상태의 결과와 매우 달랐으며, 해수 침출면이 방조제의 하부가 아닌 상부에 존재함을 보였다.

• Journal of the Korea Organic Resources Recycling Association
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• v.26 no.2
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• pp.19-32
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• 2018

This study has been carried out to analyze the effects of leachate recirculation on methane gas concentration in the Landfill. The monthly average on precipitation of the landfill area during the period from 2010 to 2016 has been recorded at 130.9 mm and the total precipitation was recorded at 73.7 mm for the month of June in 2017. And based on the Korea meterological administration data obtained, the water content has been anticipated to be at low level. And for the control environment testing on the effects of leachate recirculation, the reading has been carried out in relation to the methane gas concentration with the landfill site tested with average reading of 30.14%. Once the reading has been established 5 tones of leachate has been injected and the readings carried out respectively with the first reading recorded at 24.66% on June with subsequent readings carried out, 31.51 (6/24), 36.88% (7/1) and final reading carried out on 7/25 registered at 52.47%. Based on the leachate recirculation, the test showed increase of methanate concentrations with the concentration percentage showing between 50~65%.

• Journal of the Korea Organic Resources Recycling Association
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• v.15 no.2
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• pp.109-117
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• 2007

In order to investigate the quantitative and qualitative properties of leachate with different composition of MSW in solid waste landfill, three lysimeters filled with bottom ash only (Lysimeter A), bottom ash 70%+municipal solid waste 30% (Lysimeter B), and municipal solid waste only (Lysimeter C) respectively were operated under actual meteorological conditions. From the results, Lysimeter A and Lysimeter B were much higher than Lysimeter C in terms of cumulative generation rates of leachate. The pH in leachate from Lysimeter A are in the range of pH 9 to 11, however, the pH of the leachate was gradually changed to the neutral with time. In the case of $Cl^-$, leachates from Lysimeter A and B with bottom ash have high $Cl^-$ concentration whereas leachate produced from Lysimeter C has low $Cl^-$ concentration. In the Lysimeter C with municipal solid waste only, concentration of organic materials in the leachate was much higher than that of leachate produced from the other Lysimeters.

• Korean Journal of Soil Science and Fertilizer
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• v.29 no.3
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• pp.282-287
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• 1996

This study was conducted to identify the parameter better representing the nitrogen supply capacity of soils for the vegetable crops growing in vinylhouse. All the parameters showed significant positive correlation with the yield of chinese cabbage. The correlation coefficients were in the order of $NO{_3}^--N+NH{_4}^+-N(2M\;KCl)$ > $NO{_3}^--N(2M\;KCl)$ > OM > T-N > 0.01M $NaHCO_3$ > 0.01M $CaCl_2$ > $NH{_4}^+-N(2M\;KCl)$ > 6N HCl. Between the soil N and N absorbed by plant, the correlation coefficients were in the order of $NO{_3}^--N+NH{_4}^+-N(2M\;KCl)$ > $NO{_3}^--N(2M\;KCl)$ > 0.01M $NaHCO_3$ > $NH{_4}^+-N(2M\;KCl)$ > 0.01M $CaCl_2$ > OM > T-N > 6N HCl. The results of this study suggest that 2M KCl extractable inorganic N. 2M KCl extractable $NO{_3}^--N$ are recommendable parameters for the estimation of N supply capacity of the vinylhouse soils. The sum of soil $NO{_3}^--N$ and fertilizer nitrogen showed highly significant positive correlation with the yields of chinese cabbage and nitrogen absorbed by the plant, while negative correlation with the nitrogen use efficiency.

• Journal of Soil and Groundwater Environment
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• v.6 no.3
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• pp.107-117
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• 2001

The characteristics of groundwater movement under the heavy rainfall at Nan-ji waste landfill site are studied using HELP(Hydraulic Evaluation of Landfill Performance) program, which calculates the daily leachate in the Nan-ji waste landfill site. In this study, instead of the average recharge value, which is used in the past study, the real reacharge value is used to calculate the daily leachater. It is found about 70 times greater than thor average recharge value under the condition of heavy rainfall in the rainy season. The flow characteristics of groundwater for water level fluctuation is simulated using the ground water flow model MODFLOW(A Modular 3-D Finite Different Groundwater Flow Model) program, and the slurry layer is newly added. The result of the study is different from that of the ordinary simulation, which shows much higher ground water level than from the ordinary simulation.

• Korean Journal of Soil Science and Fertilizer
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• v.34 no.5
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• pp.316-325
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• 2001

To develope a technique for efficiently managing fertilizer for cucumber, a quick test method to quantify nitrate content in soil solution and leaf petiole juice using a simple instrument was investigated. Among the nitrate analyzing instruments such as compact ion meter, nitrate ion meter, and test strip with reflectometer, the paper test-strip used in conjunction with a hand-held reflectometer was most closely correlated with ion chromatography method in nitrate content, and then it would be suggested with a tool that a farmer can use rapidly, conveniently and accurately for nitrate analysis in a field. Nitrate content in soil solution collected by porous cup was very variable on the lapsed time after drip irrigation and the sampling positions such as soil depth and the distance from dripper. As a result, a significant correlation between nitrate contents of soil solutions and 2M KCl soil extract was not found. However, nitrate content in soil solution extracted with a volume basis (soil:water=1:2) showed the highly significant correlation with that in 2M KCl extract. Nitrate contents of cucumber leaf petiole juices was greatly different between upper and lower leaves. Eleven to sixteen positioned-leaf would be a proper sampling position to determine nitrate content in leaf petiole for evaluating nutrient state by plant tissue analysis. From the secondary regression equations between nitrate contents of soil and petiole juice and the yield of cucumber, nitrate levels for real time diagnosis were estimated as $400mg\;l^{-1}$ soil solution by porous cup. $300mg\;l^{-1}$ in a soil volume extraction, and $1400mg\;l^{-1}$ in petiole juice from spring to summer season. In addition, the maximum yield of cucumber fruit in pot test was obtained in nitrate $1500mg\;l^{-1}$ level of petiole juice, which was similar to nitrate $1400mg\;l^{-1}$ in greenhouse trial.

• Proceedings of the Mineralogical Society of Korea Conference
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• 1996.10a
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• pp.61-72
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• 1996

중국 토양표토의 유황함량은 27에서 967mg S/kg(평균 233.2mg S/kg, n=632)범위에 있다. 이중 홍토(Haplic Acrisols)와 황갈색토(Eutric Cambisols)는 양쯔 및 Huaihe강 사이에 중국 중앙에 분포하고 유황함량은 각각 146과 159mg S/kg이다. 황색 목장토(Gleyic Cambisols)와 회색 목장토(Umbric Fluvisols)는 가장 높은 전 유황함량과 가장 높은 유황공급력을 가지고 있으나 제일 인산석회 침출 유황함량(현지유효 유황함량으로 평가)은 가장낮다. 그러나 황갈색 및 홍토는 이와는 반대 특성을 지니고 있다. Shajiang 흑토(Calcic Vertisols)와 논토양(Mollic/Eutric Fluvisols과 Anthraquic 상)은 총 유황함량, 인산 침출 유황함량과 잠재 유황 공급력에서는 중간에 속하고 남부 Huaihe강에 걸쳐있는 논토양에서 유황함량은 재배기간중 균형 상태에 있으나 전(前)작물에서 특히 밀과 유채에서는 부족한 상태이다. 황산염($SO_4^{2-}$)은 토양중 상하로 이동 되면서 균형을 유지하여 토양 수분함량과 밀접한 관계가 있다. 따라서 제일인산칼슘 용액침출 유황 함량을 가지고 표토에서 유황의 과부족을 진단하기는 그리 쉬운 일이 아니다 중국에서 수행된 유황시비 시험에서 20개 작목에서 평균 $4.3-40\%$의 수량증수를 기록하였으며 유황시비는 증수뿐만 아니라 작물의 질을 개선하나 담배잎의 연소성은 유황함량과 부의 상관이 있다.

• Journal of the Korean Society of Groundwater Environment
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• v.2 no.1
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• pp.1-8
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• 1995

Wastes produce groundwater contamination, offensive odor, and hazardous gases. This study investigates the contamination of groundwater at the Seokdae waste landfill area and seeks the desirable ways to minimize the groundwater contamination. Groundwater levels, water chemistry and aquifer characteristics of wells were examined around the Seokdae waste landfill. The water chemistry of the Dong stream, the groundwater distribution and flow were also studied. The results of this research show that the estimated quantity of the percolation from the landfill base to the ground is 520 ㎥/day and the extent of groundwater contamination is about 1-1.5 km from the center of the waste landfill. The groundwater contains heavy metals and other toxic elements. The conservation and management of the groundwater of the waste landfill need several monitoring wells to check the quantity and quality of groundwater, pumping wells to extract the contaminated groundwater, and slurry walls to protect the movement of contaminated groundwater.