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이용민,오참뜻,김국진,이철효,성기준,Yi, Yong-Min,Oh, Cham-Teut,Kim, Guk-Jin,Lee, Chul-Hyo,Sung, Ki-June 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4
Various methods are used to remediate soil contaminated with heavy metals or petroleum. In recent years, harsh physical and chemical remediation methods are being used to increase remediation efficiency, however, such processes could affect soil properties and degrade the ecological functions of the soil. Effects of soil washing, thermal desorption, and land farming, which are the most frequently used remediation methods, on the physicochemical properties of remediated soil were investigated in this study. For soils smaller than 2 mm, the soil texture were changed from sandy clay loam to sandy loam because of the decrease in the clay content after soil washing, and from loamy sand to sandy loam because of the decrease in the sand content and increase in silt content during thermal desorption, however, the soil texture remained unchanged after land farming process. The water-holding capacity, organic matter content, and total nitrogen concentration of the tested soil decreased after soil washing. A change in soil color and an increase in the available phosphate concentration were observed after thermal desorption. Exchangeable cations, total nitrogen, and available phosphate concentration were found to decrease after land farming; these components were probably used by microorganisms during as well as after the land farming process because microbial processes remain active even after land farming. A study of these changes can provide information useful for the reuse of remediated soil. However, it is insufficient to assess only soil physicochemical properties from the viewpoint of the reuse of remediated soil. Potential risks and ecological functions of remediated soil should also be considered to realize sustainable soil use.
이용민(Yong Min Yi),성기준(Kijune Sung) 한국생태공학회 2022 한국생태공학회지 Vol.9 No.1
Since the use of the remediated soil is undetermined, the quality of the soil should be appropriately evaluated according to its future use. In this study, we developed a soil quality assessment method that can be applied to soils after the remediation process. Soil quality was assessed based on soils that require productivity for use in agricultural fields and landscaping in uncontaminated, contaminated, and remediated cases using soil washing, landfarming, and thermal desorption. The results showed that the quality of soil washing treated deteriorated the most compared to landfarming and thermal desorption-treated soil, assessed based on the case of use as field soil. In the case of thermal desorption, the range of reduction was smaller than that of soil washing, but soil quality decreased slightly after remediation. However, in the case of landfarming, there was no change in soil quality after remediation. The soil quality indices calculated for landscaping also decreased the most in the soil washing because organic matter and pH decreased during the process. In the case of thermal desorption and landfarming, all the soil quality decreased due to contamination, but it increased slightly after remediation. The two indices applied in this study, SQIT and SQIA, showed similar trends, suggesting that both can be used for soil quality evaluation. Further research is needed on how much the soil quality evaluation results presented in this study can reflect the various services the soil ecosystem provides, that is, the actual soil functions in these soils.
정화토양 및 배출가스의 환경적 특성 분석을 통한 저온열탈착장치의 현장 적용성 평가
오참뜻,이용민,김용성,전우진,박광진,김치경,성기준,장윤영,김국진,Oh, Cham-Teut,Yi, Yong-Min,Kim, Young-Soung,Jeon, Woo-Jin,Park, Gwang-Jin,Kim, Chi-Kyung,Sung, Ki-June,Chang, Yoon-Young,Kim, Guk-Jin 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.3
Geochemical and ecological properties of remediated soil and gas exhausted from a low-temperature thermal desorption (LTTD) process were analyzed to assess the environmental impact of LTTD treatment. Soil characteristics were examined with regard to the chemical (EC, CEC, and organic matter) and the ecological (dehydrogenase activity, germination rate of Brassica juncea, and growth of Eisenia andrei) properties. The exhaust gases were analyzed based on the Air Quality Act in Korea as well as volatile organic compounds (VOCs) and mixed odor. Level of organic Organic matter of the soil treated by LTTD process was slightly decreased compared to that of the original soil because the heating temperature ($200^{\circ}C$) and retention time (less than 15 minutes) were neither high nor long enough for the oxidation of organic matter. The LTTD process results in reducing TPH of the contaminated soil from $5,133{\pm}508$ mg/kg to $272{\pm}107$ mg/kg while preserving soil properties. Analysis results of the exhaust gases from the LTTD process satisfied discharge standard of Air Quality Law in Korea. Concentration of VOCs including acetaldehyde, propionaldehyde, butyraldehyde and valeraldehyde in circulation gas volatilized from contaminated soil were effectively reduced in the regenerative thermal oxidizer and all satisfied the legal standards. Showing ecologically improved properties of contaminated soil after LTTD process and environmentally tolerable impact of the exhaust gas, LTTD treatment of TPH-contaminated soil is an environmentally acceptable technology.
박소영(So Young Park),이용민(Yong Min Yi),성기준(Ki June Sung) 한국생태공학회 2019 한국생태공학회지 Vol.7 No.1
Phragmites communis provide a variety of ecological functions, but they are highly invasive, aggressively reproduced, and difficult to remove. When they are over-extended and dominant species, wetland ecosystems are simplified and their ecological services are reduced. In this study, reoccurrence and growth characteristics of reed were investigated at 850 days after the application of various reed management methods under field conditions. The results showed that the removal of the only aboveground part of reed had no effect on reducing reoccurrence and growth. However, the removal of only 50 cm of the belowground part applied to this experiment, can prevent some reoccurrence of reeds. The most efficient way to inhibit the reoccurrence and growth of reeds was to use a completely covered weed mat after removing the belowground part. This prevents reoccurrence of reeds from the rhizosphere, intrusion of reeds from neighboring areas, and inhibits photosynthesis through shading. However, weed mats cannot be a permanent management tool and can interfere with the growth of other beneficial wetland plants. After the reeds were eliminated, weed mats should be removed. It may then need to plant other native plants or manipulate the water level to prevent recurrence of the reeds.