• 대한환경공학회지
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• 제39권6호
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• pp.348-355
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• 2017

인간활동에 의한 토양오염은 지속적으로 발생되고 있으며, 이를 과학적이고 합리적으로 관리하기 위한 인체 및 생태 위해성평가의 중요성이 부각되고 있다. 하지만 국내에서 생태계를 수용체로 하는 위해성평가에 대한 제도적 장치가 마련되어 있지 않으며, 이에 대한 평가체계와 활용가능한 기반 마련이 필요할 것으로 사료된다. 본 연구에서는 국내형 토양생태 위해성평가(soil ecological risk assessment) 체계를 제시하였으며, 이를 수행하기 위한 구체적인 내용들을 정리하였다. 토양생태 위해성평가는 오염물질에 대한 생태계 보호수준을 의미하는 예측무영향농도 산출을 목적으로 하고, 토양생태 독성자료 수집 및 적합성 확인, 토양생태 독성자료 표준화, 생태독성자료 충족도 확인 및 예측무영향농도 산출, 생태위해도결정의 단계로 수행할 수 있다. 수집된 생태독성자료는 신뢰도지수에 따라 적합성을 먼저 확인하며, 필요기준(국내 서식종, 급 만성, 독성종말점, 토양특성 분류)에 따라 순차적으로 정리하여 평가체계에 적용하는 방안을 제안하였다. 예측무영향농도는 생태독성자료 수준에 따라 저신뢰, 중간신뢰, 그리고 고신뢰 수준 중 하나의 산출 기법을 이용하며, 이를 통해 최종적으로 생태 위해도를 결정하는 방식을 제안하였다. 본 연구는 차후 토양오염물질에 대한 생태위해성평가 지침 제정에 있어 기본 체계로 활용될 수 있을 것으로 사료된다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 추계학술발표논문집
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• pp.100-102
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• 2009

Effect of temperature, pH and soil depth on germination of Dianthus chinensis, Dianthus barbatus, and Perennial pennant were investigated in growth chamber and soil condition at the ratio of 7:3 (natural soil and organic soil) in laboratory condition. the optimum temperature for seed germination was recorded for $20^{\circ}C-\;25^{\circ}C$. Maximum germination was observed for Dianthus barbatus (76%) where as in soil condition Perennial pennant (51%) showed maximum germination at 1 cm soil depth. Similarly, optimum pH for seed germination was at pH 6 in all the species. So in lower pH (at pH4) seed germination was inhibited. Germination of these selected species at different environmental condition help to construct the ecological sound proof wall to mitigate the noise especially in urban areas.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권4호
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• pp.104-112
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• 2015

In this study, several factors which can have an effect on soil during strategic environmental assessment (SEA) are analyzed against a total of 86 administrative plans and development basic plans of the SEA. Other factors which could have influences on soil are also analyzed after examining contents and rules required for preparing the SEA statement. Then, we propose assessment factors on soils during the SEA procedure. We think that this study could give baseline data to set up assessment items, criteria, and techniques that are highly necessitated in preparation of the SEA statement in the near future.

• Environmental Engineering Research
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• 제22권2호
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• pp.224-229
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• 2017

Zinc oxide nanoparticles (ZnO NPs) have been used as additives in a variety of consumer products. While these particles may enter the environment, only a limited number of studies have investigated the effects of ZnO NPs on soil exoenzymes. Here, we investigate the long-term effects of ZnO NPs at concentrations of 50 and 500 mg/kg on the activities of six soil exoenzymes in planted soils: Dehydrogenase, fluorescein diacetate (FDA) hydrolase, urease, acid phosphatase, arylsulfatase, and ${\beta}-glucosidase$. Significant effects were observed at one or more time points for all enzymes except for FDA hydrolase. These effects included both decreases and increases in enzyme activity. Our results suggest that ZnO NP treatments of 50 and 500 mg/kg can adversely affect soil enzymes, particularly acid phosphatase and urease, and thus, these data may have implications for phosphorous and nitrogen cycles in the soil.

• 한국지하수토양환경학회지:지하수토양환경
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• 제16권3호
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• pp.28-37
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• 2011

A preliminary study for energy efficient soil heating and contaminant removal using microwave was conducted. Soils sampled from floodplain were heated with microwave oven, and soil heating property and energy efficiency were compared to those heated with electrical furnace. In addition the effects of water, soil organic matter, and contaminated diesel on soil heating with microwave were investigated. Even though the electrical power consumption of electrical furnace and microwave oven were similar, temperature of soil heated with microwave oven was significantly higher than that of soil heated with electrical furnace. The increase of soil moisture content delays the raise of soil temperature during heating it with microwave oven. However, the effects of total petroleum hydrocarbon (TPH) (<10%) in contaminated soil matrix and small amount of soil organic matter (<5%) on the increase of soil temperature by microwave were not significant. Further studies for contaminated soils with different texture using pilot scale microwave reactor are required for application of this technique in the field.

• Journal of Microbiology and Biotechnology
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• 제30권9호
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• pp.1310-1320
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• 2020

Low-quality soil for land reuse is a crucial problem in vegetation quality and especially to waste disposal sites in mining areas. It is necessary to find suitable materials to improve the soil quality and especially to increase soil microbial diversity and activity. In this study, pot experiments were conducted to investigate the effect of a mixed material of humic acid, super absorbent polymer and biochar on low-quality soil indexes and the microbial community response. The indexes included soil physicochemical properties and the corresponding plant growth. The results showed that the mixed material could improve chemical properties and physical structure of soil by increasing the bulk density, porosity, macro aggregate, and promote the mineralization of nutrient elements in soil. The best performance was achieved by adding 3 g·kg^-1 super absorbent polymer, 3 g·kg^-1 humic acid, and 10 g·kg^-1 biochar to soil with plant total nitrogen, dry weight and height increased by 85.18%, 266.41% and 74.06%, respectively. Physicochemical properties caused changes in soil microbial diversity. Acidobacteria, Bacteroidetes, Chloroflexi, Cyanobacteria, Firmicutes, Nitrospirae, Planctomycetes, and Proteobacteria were significantly positively correlated with most of the physical, chemical and plant indicators. Actinobacteria and Armatimonadetes were significantly negatively correlated with most measurement factors. Therefore, this study can contribute to improving the understanding of low-quality soil and how it affects soil microbial functions and sustainability.

• Geomechanics and Engineering
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• 제17권5호
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• pp.439-444
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• 2019

It is generally known that high strength soil is indicative of well-graded particle size distribution. However, there are some special cases of firm ground despite poor grade distribution, especially a specific gap-graded soil. Based on these discoveries, this study investigated the development of an additive of gap-graded soils designed to increase soil strength. This theoretical concept was used to calculate the mixed ratio required for optimal soil strength of the ground sample. The gap-graded aggregate was added according to Plato's polyhedral theory and subsequently calculated ratio and soil strength characteristics were then compared to characteristics of the original soil sample through various test results. In addition, the underground stress transfer rate was measured according to the test conditions. The test results showed that the ground settlement and stress limit thickness were reduced with the incorporation of gap-graded soil. Further field tests would confirm the reproducibility and reliability of the technology by using gap-graded soil to reinforce soft ground of a new construction site. Gap-graded soil has the potential to reduce the construction cost and time of construction compared to other reinforcing methods.

• 한국환경농학회지
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• 제37권4호
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• pp.277-282
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• 2018

BACKGROUND: At these days, the human health and environmental concerns of pesticide used for turf grass management at golf courses in Korea have increased. The objectives of the study were to determine the pesticide residues for golf course and neighboring area and evaluate the impact moved into neighboring area of pesticides treated at golf courses. METHODS AND RESULTS: Three golf courses and neighboring areas in Korea were monitored from July to October, 2017. The soil sample collection was divided the golf course into its logical parts (such as a greens, fairways, and rough) and neighboring area soil samples were collected at three different points. The water samples of the golf course and neighboring area were collected at three different points, respectively. The pesticide residues for soil and water sample were monitored by the multi-residue screening method of 98 pesticide with HPLC-MS-MS. The concentrations of detected pesticide in soil and water samples of the golf course were in the range of 0.01~1.26 mg/kg and 0.0001~0.0089 mg/kg, respectively. The residue levels for detected pesticides in neighboring area were at 0.01~0.04 mg/kg and 0.0001~0.0029 mg/kg, respectively, well below those level in golf course. CONCLUSION: This study indicate that the pesticide residue levels of golf course and neighboring area in Korea may not a possible risk of exposure on soil and aquatic environment. For future work, more monitoring should be performed so that the evaluation data becomes more valid.

• The Korean Journal of Ecology
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• 제12권3호
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• pp.203-208
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• 1989

This study was objected to figure out the soil microarthropod fauna in forests with different flora, and to elucidate how environmental factors affect the diversity of soil microarthropods. Relationships between the distribution density of soil microarthropods and environmental factors were correlated positively with organic matter and C/N ratio. By the calculation of the contribution coefficients, organic matter, amount of precipitation, C/N ratio, and soil moisture were found to be major environmental factors that affect the distribution of soil microarthropods.

• Environmental Engineering Research
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• 제10권4호
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• pp.199-204
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• 2005

Experiments were performed to estimate the organic release from the aquifer soil in riverbank and/or riverbed filtration via a kinetic approach. Organic release was assumed as a reaction of first order regarding concentrations in both soil and water phases. The reaction rate constants were obtained by comparing the model predictions with the experimental data of organic release reaction and the equilibrium distribution of organic matter between water and soil phases. Results show that the organic release from the aquifer soil was not negligible under normal conditions in Korea reaching 4.7mg-COD/L-day. This indicates that manganese and iron start to be released from aquifer soil in the riverbank filtration in the middle reach of the Nakdong river if the travel time of the filtrate exceeds about 5 days. It was also seen that the COD of the soil organic matter was 0.89mg-COD/mg-OM and that 65% of the COD was BOD5.