• 제목/요약/키워드: soil dust

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Applicability Evaluation of Eco-Friendly Binder Material using Desulfurized Dust in Deep Cement Mixing Method (탈황분진을 활용한 친환경 안정재의 심층혼합공법 적용성 평가)

  • Ko, Hyoung-Woo;Seo, Se-Gwan;An, Yang-Jin;Kim, You-Seong;Cho, Dae-Sung
    • Journal of the Korean Geosynthetics Society
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    • v.15 no.2
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    • pp.1-12
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    • 2016
  • In this study, laboratory mixture design test and field test were performed to evaluate applicability of eco-friendly binder material (CMD-SOIL) using desulfurized dust in deep cement mixing method (DCM). As a result of laboratory mixture design test, the uniaxial compressive strength of CMD-SOIL was up to 1.136 times bigger than slag cement by changing the water content, mixing rate, and W/B. Also, it had shown the strength up to 1.222 times bigger in shell content and up to 1.363 times in mixing of floating soil. As a result of field test, field strength/laboratory design criterion strength ratio (${\lambda}$) is shown 0.77. And this result was similar to earlier studies. From this result, CMD-SOIL can show the same efficiency compared with existing binder.

Source Characterization of Suspended Particulate Matter in Taegu Area, Using Principal Component Analysis Coupled with Multiple Regression (주성분/중회귀분석을 이용한 대구지역 대기중 부유분진의 발생원별 특성평가)

  • 백성옥;황승만
    • Journal of Korean Society for Atmospheric Environment
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    • v.8 no.3
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    • pp.179-190
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    • 1992
  • This study was carried out to characterize sources of atmospheric total suspended particulates (TSP) in urban and sub--urban areas of metropolitan taegu. The sources were tentatively identified by a multivariate technique, i.e. principal component analysis (PCA), and the source contributions to the atmospheric concentrations of TSP were further estimated by stepwise multiple regression analysis. A total of 5 sources was identified in the urban area of Taegu (soil dust resuspension, fuel combustion, secondary aerosol, traffic related aerosol, and refuge burning), while 4 sources were found to be significant in the sub--urban area as following: fuel combustion/secondary aerosol, soil dust resuspension, traffic related aerosol, and wood/agricultural burning. The largest contributor to the atmospheric TSP appeared to be the soil dust resuspension in both areas. The source apportionment of the extractable organic matter (EOM) was also carried out for the Taegu data. The EOM was determined with respect to the solvent polarity, i.e. cyclohexane (non-polar), dichloromethane (semi--polar), and acetone (polar). In addition, the source profiles for the TSP in Taegu area were estimated using a PCA-based algorithm, and the validity was evaluated tentatively by comparing the data in the literature.

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Grain-Size Distribution of Source Areas of Asian Dust (Yellow Sand) in China

  • Yi, Hi-Il;Shin, Im-Chul
    • The Korean Journal of Quaternary Research
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    • v.21 no.2
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    • pp.77-79
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    • 2007
  • The source regions of Asian Dusts (Yellow Sands) in the western part of China are investigated, and the soil samples are collected samples for approximately 15 days during the spring of 2005. Particle sizes of sediments are analyzed and compared with each other. These grain-size analyses from the source areas can be compared Particle sizes between loess deposits and desert sands in western part of China and desert areas show distinctive differences. Loess deposits are predominantly composed of fine sands and silts. The distinction between the final characteristics of Asian Dust particles arrived in Korea and characteristics during transportation can be recognized comparison with the Asian Dust particles collected where the dust particles settled down. The characteristics of Asian Dust particle sizes can provide the basic information regarding the transportation history from the source region.

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Effects of Asian Dust on Fruiting and Fruit Quality in Korean Fruit Trees Based on Artificial Spray Experiments Using Loess from the Source Region (황사 발원지 황토를 이용한 인공 황사 살포처리가 과수의 착과와 과실품질에 미치는 영향)

  • Seo Hyeong-Ho;Kim Jeom-Kuk;Park Moo-Yong;Kim Seung-Heui;Do Kyung-Ran
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.8 no.3
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    • pp.169-173
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    • 2006
  • This study used loess from the source region of Asian dust (a desert area in China) to analyze the effects of Asian dust on fruiting and fruit quality in Korean fruit trees. Asian dust and loess from the source region were highly alkaline compared to average Korean field soil. Organic material contents of Asian dust were about three times as high as that of the average field soil. Loess was dusted onto the stigma of apple, pear, and peach trees. fruiting, seed number, fruit quality and pollen tube elongation were investigated. Pollination and fertilization were not influenced while pollen tube elongation was slightly influenced. Consequently, fruiting, seed number and fruit quality were not affected by the dusting treatment.

A Study on the Dust Control Effect of PM10 Dust Inhibitor by Polysaccharides and its Effect on Water Quality and Soil Environment (Polysaccharides를 이용한 PM10 먼지억제제의 먼지제어 효과와 수질 및 토양 환경에 미치는 영향에 대한 연구)

  • Lee, Han Seob;Choi, Sung Boo;Hwang, Su Jin;Hwang, Hyun Seok
    • Journal of Korean Society of Environmental Engineers
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    • v.39 no.2
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    • pp.59-65
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    • 2017
  • In this study, A dust inhibitor for $PM_{10}$ was prepared by using molecular structure, molecular weight, viscosity, hydrophilicity, swelling and wetting / moisturizing properties of natural polysaccharide which is widely used as food and cosmetic materials. Various dust control effects were confirmed and superior results were obtained than simple water spraying and synthetic PVA as a control. In addition, the comparison of water evaporation, pot test of cabbage seed germination, effects on fish and aquatic plants, and effects on herb plant growth were studied and the safety of soil and water quality was studied. The availability of the dust inhibitor was confirmed.

Changes in aerosol characteristics during 2006 ~ 2008 Asian dust events in Cheonan, Korea (2006 ~ 2008년 황사기간 중 천안시 대기 입자의 특성 변화)

  • Oh, Se-Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1642-1647
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    • 2009
  • Changes in aerosol characteristics during 2006 ${\sim}$2008 Asian dust events in Cheoan were investigated by measuring mass, ion and elemental concentrations of fine and coarse particles. The average mass concentrations of daily TSP, PM10, PM2.5 were 214.9, 160.3, and 95.9${\mu}\;g/m^3$during Asian dust events, which were 3.08, 2.58, and 1.95 times higher than Non-asian dust events. The maximum concentrations of TSP, PM10, and PM2.5 were 850.1, 534.4, and 233.3${\mu}\;g/m^3$, which were 12.19, 8.60, and 4.76 times higher, respectively. Increases in ion concentrations were not significant during Asian dust events, but elemental concentrations including soil components such as Fe, Al, Ti increased by 17.1 and 43.4 times for fine and coarse particles, respectively. The results clearly indicate that metallic components from soil constituents were the major components in Asian dusts sampled at Cheonan.

Recycle Possibility of the Stone-Dust in Quarry as Subbase Layer Materials of the Road (도로 보조기층재로서 채석장 석분토의 재활용가능성 분석)

  • Kim, Kyeong-Su;Song, Young-Suk
    • The Journal of Engineering Geology
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    • v.17 no.2 s.52
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    • pp.279-287
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    • 2007
  • An ore of stone obtained from quarry lose its about 60% such as the muck and the stone-dust during the process of making the architectural block, the crushed aggregate and so on. A part of the muck is only reutilized for the crushed aggregate as road pavement materials, while the most of the muck in the shape of powder is mixed with water and then it is deposited in a sludge tank. The muck in the shape of powder is called the stone-dust. If the stone-dust is discharged and sprayed, an ecosystem will have terrible damage because the seepage of surface water, the flow of ground water and the movement of air are not occurred smoothly by packing the void of soils. As the Waste Management Law (2003) in Korea, the stone-dust is sorted out the industrial waste and the most of that is dumped in ground. Therefore, the establishments of an efficient recycling plan are necessary through the improvement of engineering properties of the stone-dust. To investigate the possibility of recycle and improvement for the stone-dust, the stone-dust and natural soils are sampled from six quarries in Korea. The various soil tests are performed by use of the mixed soils with the stone-dust content ratio. As the result of various soil tests, the recycle possibility of the stone-dust is analyzed as subbase layer materials of the roads.

Study on control of road dust using Cosmetic Material and Natural Polymer (화장품 소재와 천연고분자를 이용한 도로분진 제어에 대한 연구)

  • Lee, Han Seob;Choi, Sung Boo
    • Journal of the Korean Applied Science and Technology
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    • v.35 no.1
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    • pp.284-291
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    • 2018
  • In this study, a dust inhibitor for road dust was prepared by using molecular structure, molecular weight, viscosity, hydrophilicity, swelling, wetting and moisturizing properties of natural polysaccharide which is widely used as food and cosmetic materials. Various dust control effects were confirmed and superior results were obtained than simple water spraying and synthetic for control(PVA). In addition, the comparison of water evaporation, scattering inhibition rate, Field test, and determining acute lethality of effluents to Daphnia magna were studied and the safety of soil and water quality was studied. The availability of the dust inhibitor was confirmed.

Elemental Composition of PM2.5 Particulate with a 3-Stage DRUM Sampler during Spring and Summer Seasons in Urban Area of Gwangju, Korea (3-Stage DRUM 샘플러를 이용한 광주 도심지역의 봄철과 여름철 PM2.5 원소적 조성 비교)

  • Ryu S.Y.;Kim Y.J.
    • Journal of Korean Society for Atmospheric Environment
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    • v.21 no.6
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    • pp.699-708
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    • 2005
  • To characterize the elemental composition of fine particles in urban area, $PM_{2.5}$ was collected by a 3-stage DRUM impactor at Gwangju during spring and summer. Time and size resolved concentrations for 19 trace elements were obtained by synchrotron X-Ray fluorescence analysis. Trace elements in summer were distributed in smaller size range compared to those in spring. Almost trace element concentrations in fine particles were highly increased during the Asian dust. In spring, soil elements such as Si, K, Ca, Ti and Fe had low enrichment factors indicating the dominant influence of soil dust. However, all elements had high enrichment factors in summer implying that these elements could be emitted from the anthropogenic sources. Factor analysis was conducted with the elemental composition data in order to identify anthropogenic sources of aerosols in urban area during spring and summer. Fine particles in spring have several sources such as soil dust originating from China continental region, coal and oil combustion, biomass burning, sea salt, ferrous and nonferrous metal sources. On the other hand, fine particles in summer were influenced by road dust, gasoline vehicle as well as coal and oil combustion, sea salt, ferrous and nonferrous metal sources.

Proposal of stability standards for slopes reclaimed by soils mixed with stone dust (석분슬러지 혼합토 매립사면에 대한 안정성 기준 제안)

  • Song, Young-Suk;Kim, Kyeng-Su
    • The Journal of Engineering Geology
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    • v.17 no.3
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    • pp.425-434
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    • 2007
  • In this paper, the stability standards of slopes reclaimed by soils mixed with stone dust were proposed to manage the stone dust as recovery soils. First of all, the mixed ratio between stone dust and natural soil is classified into 5 groups, and a series of soil test was performed in each group. As the results of tests, the shear strength and the maximum dry unit weight were increased in decrease of the mixed ratio of stone dust. On the basis of the investigation to the safety factor standards of embankment slopes in and outside the country, a slope stability rank of slopes reclaimed by mixed soils were divided into 3 stages such as unstable stage, attention stage and stable stage. The slope angle, the slope height and the mixed ratio with stone dust were proposed by the result of stability analysis of slopes reclaimed by mixed soils. As the result of slope stability analysis, the slope angle of 1 : 1.8 at the reclaimed slope should be constructed in case of the slope height of 10 m. Also, the slope angle of 1 : 1.8 and the mixed ratio of stone dust less than 50% should be constructed in case of the slope height of 15 m. The analysis result of reclaimed slope constructed inside the quarry is similar to that of reclaimed slope constructed on the open ground in same conditions of the slope angle, the slope height and the mixed ratio with stone dust. The proposed stability standards of slopes reclaimed by soils mixed with stone dust can be used practically at the quarrying site.