• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.1041-1044
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• 1996

The plastic-film-covered hill planter is a new-type seeding machine, including tow types which are mounted by 11kw and 40 kw tractors. It is made up of fertilizing , plastic-film covering perforating film and hole seeding, soil sealing apparatus, and can work at 5-7kw/h. The plastic-film covering and seeding of cotton, corn and soybean can all use this machine. The plastic-film-covered hill planter is mainly composed of plastic film covering unit, drum-type hill-drop unit and furrow coverer, some other types are also equipped with fertilizer drill unit. It can do combined work of covering plastic film , sowing , plastic film perforating , soil covering at one time, and it is suitable to the covering plastic film as well as planting of the grandulated crops, such as cotton , corn, soybean and so on.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.54-65
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• 2000

This study was performed to analyze the changes of electrical conductivity with increasement of water requirements for desalinization in reclaimed tidelands and to obtain the basic data for developing prediction techniques of desalinization to be applicable in the beginning of tideland reclamation. Two different desalinization experiments were conducted through the leaching method by subsurface drainage and the rinsing method by surface darainage, using the samples of silt soil and silt loam soil collected in 5 units of tideland reclamation projects. Regression equations were obtained in order to investigate the changes of electrical conductivity during the desalinization of reclaimed tidelands and to estimate water requirements for desalinization.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1996년도 사용종료 매립지의 안정화 에 관한 국제 세미나
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• pp.87-95
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• 1996

The stabilization and reclamation of old disposal sites is becoming more important as significant numbers of disposal sites are closed and abandoned. This technical paper covers an overview of the key issues and methodologies for stabilizing and constructing facilities on old landfills. The slide portion of this presentation also include photographs showing actual construction activities. The key issues that are prevalent in remediating and closing old landfills are : correcting the stormwater flow, leachate breakout, constructing cover caps, controlling landfill gas migration and odors, cleanup groundwater and stabilizing side slopes. Some key techniques for constructing facilities on old landfills include： use of piling, installation of active landfill gas systems, providing LFG barriers under buildings, using utilidors and flexible utility interfaces and designing for site settlement. This Paper provides proven conceptual methods for solving these problems.

• 한국토양비료학회지
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• 제49권6호
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• pp.655-661
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• 2016

Relationships between saturated conductivity (Ks) and separate contents were evaluated from 44 soil series of arable lands: 18 for paddy fields and 26 for upland crop fields. Saturated hydraulic conductivities of A, B, and C horizons were determined with tension infiltrometer and Guelph permeameter in situ. Sand, silt, clay, and organic matter content of each horizon were analyzed. Based on correlation analysis, sand separate had a positive relationship with Ks for both paddy (r=0.27, p=0.017) and upland fields (r=0.24. p=0.030). Clay content had a negative relationship with Ks for paddy soils (r=-0.32, p=0.005) while significant correlation between them was not found for upland crop fields (r=-0.20, p=0.07). Organic matter content showed a positive relationship with Ks only for upland crop fields (r=0.33, p=0.002). Due to low correlation coefficients between separate contents and Ks, performance of pedotransfer functions was not enough to estimate Ks. It implies that hydraulic properties of arable lands were affected by other factors rather than particle characteristics. Platy structure and plow pan were suggested to limit Ks of paddy fields. Soil compaction and diversity of parent materials were proposed to influence Ks of upland crop fields. It suggests that genetic processes and artificial managements should be included in pedotransfer functions to estimate hydraulic properties appropriately.

• 자원환경지질
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• 제54권4호
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• pp.457-464
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• 2021

본 연구는 강원지역 폐탄광 산림복구지에서 산림복구사업 후 시간경과에 따른 토양 화학적특성을 분석하여 관리방안 도출을 위해 수행하였다. 연구대상지는 강원도 정선군 5개 폐탄광과 영월군 3개 폐탄광 총 8개 폐탄광 산림복구지였으며, 경과시간별로 총 11회에 걸쳐 토양 화학적 특성을 분석하였다. 분석항목은 토양 pH, TOC, 총질소, 탄질률, 유효인산 등 5개 특성이었다. 분석결과 토양 pH와 유효인산 함량은 시간경과에 따라 감소하는 경향을, TOC와 총질소 함량, 탄질률은 증가하는 경향을 보였다. TOC와 총질소는 10년 경과시 폐탄광 산림복구를 위한 복토재의 품질기준을 만족하였으며, 토양 pH는 품질기준보다 낮아졌다. 따라서 산림복구사업후 토양 화학적 특성에 대한 장기모니터링 및 이를 통한 사후관리방안 수립이 필요하다.

• 한국토양비료학회지
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• 제43권5호
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• pp.546-551
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• 2010

폐탄광 지역에 대해 올바른 산림복구 방안과 사후관리방안 수립을 위한 기초자료로 활용하기 위해 영남, 호남, 충청, 강원 등 4개 지역의 폐탄광 산림복구지를 대상으로 토양을 채취하여 화학적 특성을 분석하였다. 토양 pH는 평균 5.5 (4.2~8.1)였으며, TOC와 전질소, 유효인산은 각각 1.1% (0.1~2.6), 0.08% (0.02~0.14), 16.1 ppm (3.4~63.1)으로 나타났다. CEC는 13.4 $cmol_c\;kg^{-1}$ (7.5~25.8 $cmol_c\;kg^{-1}$), 총균수는 $4.9{\times}10^{12}CFU\;g^{-1}$ ($6.0{\times}10^5{\sim}2.5{\times}10^{13}CFU\;g^{-1}$)였다. 지역에 따라서는 토양 pH는 강원 (6.1), 영남 (5.7), 호남 (5.3), 충청지역 (4.7) 순으로 높았으며, TOC와 총균수는 차이가 없었다. 전질소는 영남 (0.10%) > 충청 (0.08%), 호남 (0.07%) > 강원지역 (0.06%)이었으며, 유효인산은 영남 (23.9 ppm), 충청 (24.5 ppm) > 호남 (10.9 ppm), 강원지역 (4.9 ppm)이었다. CEC는 영남지역 (17.5 $cmol_c\;kg^{-1}$)이 다른 세 지역보다 높았다. 대체로 영남지역이 다른 지역에 비해 토양 특성이 식물 생육에 유리하였으며, 강원지역이 불리한 것으로 조사되었다. 복구공사 완료 후 시간경과에 따라 토양 화학적 특성을 비교한 결과, 토양 pH와 CEC는 시간에 따라 감소하는 경향을 보였으며, TOC와 전질소는 증가하였다. 유효인산과 총균수는 유의한 차이를 보이지 않았다. 폐탄광 산림복구지 토양의 화학적 특성이 일반 산림토양에 비해 식생 생육에 불리한 것으로 나타났으며, 원활한 식생 활착 및 생육을 위해 시비 등과 같은 지속적인 관리가 필요할 것으로 판단된다.

• 한국토양비료학회지
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• 제9권3호
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• pp.201-210
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• 1976

Only 22.7% of total land area is arable land in Korea, it is anticipated that the increased land utilization of present arable land and enlargement of arable land through the reclamation of hillside and tidal land will be of great importance for the support of increased population in the future. Followings are the prediction of increased land utilization ratios, increased arable land through the reclamation of hillside and tidal land, and the increase] in fertilizer demand up to the year of 2000. 1. On the assumption that irrigation facilities, farm mechanization, and cropping systems would be improved remarkably by the year of 2000, the land utilization ratios of paddy land and upland are estimated to be 179% and 193% respectively. 2. Increments of fertilizer demand due to increased land utilization ratios, are estimated to be 2, 290 M/T in 1980, 70, 611 M/T in 1990, and 153, 619 M/T in 2000, when the amounts of fertilizers per unit area are fixed at present lrevels. 3. Increments of fertilizer demand due to the expansion of arable land through the reclamation of 516,330 ha of hillside land and 160,568 ha of tidal land, which are the present estimation of the reclaimable areas, are estimated as 32,960 M/T in 1980, 136,320 M/T in 1990, and 366,861 M/T in 2000. 4. Total increments of fertilizer demand due to the increased land utilization of arable land and the expansion of arable land through the reclamation of hillside and tidal lands in 2000's are estimated as 196,285 M/T for N, 147,351 M/T for $P_2O_5$, and 176,844 M/T for $K_2O$.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권4호
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• pp.66-72
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• 2015

The aim of this study was to enhance of the Discfilter process (maximum treatment capacity - 500 ton/day) removal efficiency for small-scale wastewater reclamation under various influent wastewater conditions (with / without coagulation process, coagulant content and temperature). The result of chemical resistance test for fiber filter in the Discfilter that weight loss was obtained with 0.535% under pH 3, 0.092% under pH 9 and 0.028% under 10% NaClO. The removal efficiency test of Discfilter process on the with / without coagulation process showed that with coagulation process condition was occurred COD_Mn of 42.26 ± 0.61, BOD₅ of 88.72 ± 0.44, T-P of 84.67 ± 0.72 and SS of 90.58 ± 0.61. The removal efficiency of Discfilter process on the coagulant content (4.5, 5.0 and 5.0 mL/min) and temperature (< 10℃, 10℃~ 20℃ and > 20℃) conditions were increased as coagulant content and temperature increased. This study demonstrated the potential application of Discfilter process for small-scale wastewater reclamation.

• 한국지하수토양환경학회지:지하수토양환경
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• 제18권7호
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• pp.41-53
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• 2013

The study is to propose the optimal separation technique of heavy metals (Pb and Zn) contaminated in soil for improving the removal efficiency by various applicable techniques. The heavy metal contaminated soil samples near abandoned mine X-1 and X-2 were used for the study. Firstly, the wet classification process was shown more than 80% of removal efficiency for lead and zinc. Meanwhile, the magnetic separation process was shown low removal efficiency for lead and zincs because those heavy metals were non-magnetic materials. For the next step, the flotation separation process was shown approximately 24.4% of removal efficiency for zinc, while the gravity concentration process was shown approximately 57% of removal efficiency for lead, and 19.9% of removal efficiency for zinc, respectively. Therefore, zinc contaminated in soil would be effectively treated by the combination technique of the wet classification and the flotation technique. Meanwhile, lead contaminated in soil would be effectively treated by the combination technique of the wet classification process and the flotation process. Furthermore, the extraction of organic matter was shown more effective with aeration, 3% of hydrogen peroxide and 3% of lime such as calcium hydroxide.

• 한국토양비료학회지
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• 제49권1호
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• pp.75-80
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• 2016

This study was conducted to evaluate effect of chemical amendments on reducing bioavailable fraction of heavy metals in soil along with ecotoxicological effect on earthworms, Eisenia fetida. Three different chemical amendments, lime (L), steel slag (SS), and acid mine drainage sludge (AMDS), were applied with varied application ratio (1, 3, 5%). Heavy metal contaminated soil was mixed with chemical amedments and earthworms, Eisenia fetida, were cultivated for 28 days. Bioavailable fraction of heavy metals (Cd, Cu, Pb, and Zn) extracted with 0.1N HCl was monitored and also, mortality, growth, and metal concentration in earthworm were assessed. Result showed that all three amendments had high efficiency to reduce bioavailable fraction of heavy metals in soil. In particular, lime showed the highest reduction rate of Cu (63.9-87.7%), Pb (7.90-24.65%), and Zn (40.83-77.60%) among three amendments. No mortality of earthworm was observed during experimental period except 3% and 5% AMDS treatment indicating that application of chemical amendments is safe in terms of ecotoxicological aspect. However, no positive correlation was observed between reduction of bioavaialble fraction of heavy metals in soil and earthworms. Overall, application of chemical amendments in agricultural field can be adapted for reducing bioavailable fraction of heavy metals and detoxification in soil.