• Title/Summary/Keyword: ground water pollution

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Leaching of Trifluralin in the Commerce Clay Loam Soil (토양 중 Trifluralin의 용탈)

  • Kim, Jung-Ho
    • Korean Journal of Environmental Agriculture
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    • v.15 no.4
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    • pp.464-471
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    • 1996
  • Trifluralin was selected to study the leaching potentials related to the pollution on Commerce silty clay loam soil near Baton Rouge, Louisiana, USA. The batch equilibrium of trifluralin resulted in the Koc value of 875. When the soil columns(5.4 cm i.d. × 26 cm length) were leached with three pore volumes of water, the distributions of trifluralin in soil and leachate were 99.993% and 0.007% of the total recoveries, respectively. When applied at the rate of 1,683 g/ha in the field, the amount of trifluralin within the 010 cm soil depth was 96.9% of that within the 060cm soil depth 31 days after application. The concentrations of trifluralin detected in 1- and 2m- depth wells during 62 days after application ranged from 0.04 ng/mL to 0.08 ng/mL, which were lower than 2.0 ng/mL of the U.S. EPA advisory levels for drinking water. Trifluralin was strongly adsorbed on soil and hardly reached ground water. The leaching properties of trifluralin in the fields were predicted and concurred with those in the columns.

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Development of a Prototype Equipment for Road Stripe Removing Using High Pressure Water-Jet (워터젯을 이용한 노면표시 제거장비의 프로토타입 개발)

  • Kim, Kyoon-Tai;Han, Jae-Goo;Kwon, Soon-Wook
    • Korean Journal of Construction Engineering and Management
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    • v.7 no.5
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    • pp.149-158
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    • 2006
  • Current removing process is labor intensive and time consuming, employing a conventional grinding type manual machine. This manual tasks trigger various dangers such as unexpected traffic accidents or explosions of propane gas used for finalizing removing process, leading to health damage and environment pollution by dusts and noxious gases. Accordingly, it is necessity for the development of new alternative equipment. In this paper, we have developed a prototype equipment for road stripe removing made up with a high-pressure water-jet system as a mobile type system. The following shows the results. First, an analysis of the current road stripe removal process showed that it can be divided into a) preparation, b) removal and c) ground finishing. It also showed that the b) removal process requires equipment which can cover the whole process. Second, the study compared between the productivity of the developed equipment and conventional methods, and it obtained 280% productivity improvement compared to the conventional equipment.

Nitrogen and Phosphorus Dynamics in an Salt Marsh in the Nakdong River Estuary (낙동강 하구 염습지 식물군락의 질소 및 인의 동태)

  • Kim Joon-Ho;Hyeong-Tae Mun;Byeong;Kyung-Je Cho
    • The Korean Journal of Ecology
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    • v.12 no.1
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    • pp.1-7
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    • 1989
  • We studied primary production, nitrogen and phosphorus dynamics in a salt marsh of Okryutung at Nakdong River estuary. The standing biomass in Phragmites longivalvis, Carex scabrifolia and Zoysia sinica stand was 5.48kg/m2,1.94kg/m2and1.95kg/m2, respectively. The peak above-ground biomass in each stand was 1.99kg/m2,0.74kg/m2and1.03kg/m2, respectively. Soil nitrogen decreased from the onset of growing seson till July, and then increased. Seasonal patterns of soil phosphorus were different from stand to stand. Nitrogen concentrations of above-ground plant tissus were quite different among the plant species at the very beginning of the growing season, however, they became similar as the plants grow. Seasonal pattern of phosphrous in C. scabrifolia roots was quite different from those other two species. Nitrogen absorbed by plants during season in P. longivalvis, C. scabrifolia and Z. sinicia stand was 224kg/ha, 111kg/ha, 156kg/ha, respectively. Phosphorus taken up by plants was 22kg/ha, 29kg/ha and 21kg/ha, respectively. Because the vascular plants growing at salt marshes can immobilize large quantities of nitrogen and phosphorus, salt marsh vegetation can be sued for preventing the pollution of coastal sea water.

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State Indicator of Water Quality for Surface Water and Groundwater in Agriculture

  • Kim, Min-Kyeong;Jung, Goo-Bok;Ro, An-Sung;Choi, Seung-Chul;Choi, Won-Il;Kim, Eun-Jeong;Lee, Jong-Eun;Yun, Yeo-Uk;Kim, Kab-Cheol;Ko, Do-Young;Kim, Byeong-Ho;Kim, Hyeon-Ji;Park, Sang-Jo;Lee, Seong-Tae;Heo, Jae-Young;Yang, Sang-Ho;Kang, Seong-Soo
    • Korean Journal of Soil Science and Fertilizer
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    • v.48 no.5
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    • pp.509-514
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    • 2015
  • Indicators of environmental conditions qualitatively and quantitatively describe the state of the environment and natural resources, and the OECD (Organization for Economic Cooperation and Development) has initiated and suggested AEIs (Agri-Environmental Indicators) to assess trends over time of the effects of agriculture on the environment and the effectiveness and efficiency of agricultural and environmental policy measures since 1990's. This study aims to develop the state indicators of water quality for agricultural water, surface and groundwater, to evaluate the environmental impacts of agricultural activities and policies by qualifying the environmental levels of a nation. Status indicators were calculated according to the agricultural water quality standards of OECD and Korea, and their trends were analyzed over time. Particularly, nitrate (NO3) status indicators of ground water in 2013 were significantly lower than the ones in 2000. Overall, the water quality indicators of surface water in 2013 were higher than the ones in 2012, except for pH and DO. The groundwater quality indicators in 2013 were lower than those of previous years. The optimal management indicators were calculated to assess agricultural surface water and groundwater quality. The findings of this study indicated that the state indicators could play a significant role to establish policies and procedures for managing and conserving water resources. This study also discussed water pollution caused by agricultural and industrial effluents.

A Study on New Concept of Culture (문화의 새로운 개념에 관한 연구)

  • Oh, Jeong-Seok;Youn, Ho-Chang
    • Proceedings of the Korea Contents Association Conference
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    • 2004.11a
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    • pp.36-42
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    • 2004
  • People's Interest about culture is increasing to reach in today's knowledge based society on age of modern industrial society. Conversion of human based idea arrived in step that human through scientific technique development such as life reproduction approaches gradually in God's sacred ground. Evolution of human's culture was proceeded slowly in current of such radical change.Life underestimate, religion war, pollution etc. are seeming to keep away human development.This treatise wishes to redefine concept of suitable culture in new terminology of 'SeaCricle' that have characteristic of water at 21C's New Age.

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Improvement in Plume Dispersion Formulas for Stack Emissions Using Ground-based Imaging-DOAS Data

  • Lee, Hanlim;Ryu, Jaeyong;Jeong, Ukkyo;Noh, Youngmin;Shin, Sung Kyun;Hong, Hyunkee;Kwon, Soonchul
    • Bulletin of the Korean Chemical Society
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    • v.35 no.12
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    • pp.3427-3432
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    • 2014
  • This study introduces a new method of combining Imaging Differential Optical Absorption Spectroscopy (Imaging-DOAS) data and plume dispersion formulas for power plant emissions to determine the three-dimensional structure of a dispersing pollution plume and the spatial distributions of trace gas volume mixing ratios (VMRs) under conditions of negligible water droplet and aerosol effects on radiative transfer within the plume. This novel remote-sensing method, applied to a power plant stack plume, was used to calculate the two-dimensional distributions of sulfur dioxide (SO2) and nitrogen dioxide (NO2) VMRs in stack emissions for the first time. High SO2 VMRs were observed only near the emission source, whereas high NO2 VMRs were observed at locations several hundreds of meters away from the initial emission. The results of this study demonstrate the capability of this new method as a tool for estimating plume dimensions and trace gas VMRs in power plant emissions.

A Study on the Farmstead Management in Small Agricultural Watershed using AGNPS model (농촌 비점원 오염 모형을 이용한 농촌 소유역 축산농가 관리기법에 관한 연구(지역환경 \circled1))

  • 이윤아;김성준;장석길
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2000.10a
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    • pp.536-542
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    • 2000
  • The purpose of this study is to evaluate the effect of stream quality by the farmer's livestock wastes management in a typical small agricultural watershed. AGNPS model has the capability to adjust the level of pollutant load from farmstead and the fertilization level of upland field. A small agricultural watershed(4.12 km2) which has as livestock farmhouses located in Gosan-myun, Ansung-gun was selected. AGNPS data were prepared by using Arc/info and Idrisi. 4 storm events in 1999 was used for runoff calibration, and 2 storm event which is measured in hourly-base at 4 locations along the stream were used for water quality(TN, TP) calibration. Model's behavior to stream quality for 3 cases was investigated. First, the variation of pollution produced from the cattle shed affected little to the stream quality because the cattle sheds were roofed. Second, the good management of ground in farmstead affected to stream quality with 11% and 17% decrease in TN and TP, respectively. Third, the reduction of fertilization level to upland field affected to stream quality with 27.2% and 38.5% decrease in TN and TP, respectively.

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Mechanical Properties of Oil Pollution Sand Due to Changes in the Viscosity of Oil (점도 변화에 따른 유류오염 모래의 역학적 특성)

  • Hong, Seung Seo;Bae, Gu-Jin;Kim, YoungSeok
    • The Journal of Engineering Geology
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    • v.25 no.4
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    • pp.577-585
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    • 2015
  • Contamination of soil due to an oil spill influences its subsequent behavior. An investigation was conducted to study the effect of oil viscosity on compaction characteristics, coefficient of permeability, and shear strength. Water permeability was also determined by using Kerosene, Engine oil, and Crude-oil as contaminants. The test results indicate that the compaction characteristics are influenced by oil contamination. Direct shear test was conducted to investigate the effect of oil in the pore space in sandy ground. angle of internal friction of sand (based on total stress condition) decreases due to presence of oil within the pore spaces in sand.

Consequence and Reflection of High-Input and High-Yielding Technology In Rice Culture (벼 고투입 다수확재배의 결과와 성찰)

  • Lee Ho Jin
    • Proceedings of the Korean Society of Crop Science Conference
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    • 1998.10a
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    • pp.210-232
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    • 1998
  • Tong-il, the high-yielding rice variety bred on early 1970, effected a turning point in modern rice production in Korea. As rice production reached the highest record yield in 1978 with HYV, Korea achieved self-sufficiency in domestic supply of rice (or the first time in (her own) history, HYV required high input of fertilizers and pesticides for proving its yielding ability and needed new techniques such as early nursery-planting to prevent chilling damage. But, farm economy did not follow the successful achievement of rice production because of increased farming cost and inflation.'Tong-il variety has been replaced by new high-yielding Japonica varieties from 1980 when record-low-temperature during summer months had persisted. Also, the cooked rice of Tong-il variety did not agree with the appetite of Korean people. Though the hectarage of Tong-il rice did reduce, farmers applied the same high-input cultural techniques for new Japonica cultivars as did for Tong-il variety. Heavy application of nitrogen fertilizer contaminated surface and ground water with nitrate ions while phosphorous fertilizer was blamed for algae pollution. Frequent spray of pesticide and herbicide reduced significantly the biotic population in paddy ecosystems including insects and soil microorganisms. The new technologies of the 21st century must be directed to produce safe food, to save natural resources, and to preserve a clean environment for human welfare. We need low-input sustainable farming techniques to provide high-yielding crops and to preserve a healthy ecosystem.

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A Study on the Method for Ecological Restoration on Abandoned Concrete-paved Road - Focused on the Experimental Construction Site in Young Dong Province of GyungBu Express Highway(227.24~229.04km) - (콘크리트 폐도의 생태복원 방안 모색에 관한 연구 - 경부선 영동군 황간지역 시험시공지를 중심으로(경부고속도로 227.24~229.04km 지점) -)

  • Kim, Nam Choon;Ann, Phil Gun;No, Su Dae;Kim, Do Hee
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.15 no.4
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    • pp.119-132
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    • 2012
  • The unmanaged abandoned concrete roads are vulnerable toward the issues on soil and water pollution, which requires flexible managing method such as eco-corridor after the process of ecological restoration. Among various alternations of abandoned concrete-paved roads, ecological restoration technique may be the most suitable method in sites including high quality of natural environment. Therefore, as in Young dong province, GyungBu express highway (227.24~229.04km), which is near to Hwang-gan IC, the survey to measure its effect of soil under the paving and water pollution by abandoned concrete roads was discussed. Then, the restoration method of plantings of landscape trees and hydro-seeding methods of artificial soil media was appraised through consecutive monitoring. The soil adequacy analysis shows lower percentage of heavy metal substance in each depth level compared to standard limit stated by the Ministry of Environment, along with low concerns raised after the analysis on heavy metal content of the spilled water on the concrete roads. Meanwhile, Korean Weigela (Weigela subsessilis L.H. Baily) was found to be withered in small-scale landscape trees planting sites. Among the seeding plants. the family of leguminosae, Silene armeria, Dendranthema boreale, Caryopteris incana and Aster yomena show good establishment results. Overall studies on planting of small and large landscape trees, planting method of container plants, planting method of ground cover plants, and germination and development trend of seeding plants of the experimental restoration site on abandoned concrete roads are revealing specific trends in the way landscape woody plants establishment and growth. Finally, this study suggests further studies and survey on varied plant restoration methods on abandoned concrete-roads for developed design guidelines of their methods.