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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.
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.
마이크로버블 오존 산화제와 공압파쇄 장치를 연계 적용한 지중 화학적 산화법의 정화효율 평가
오승택,오참뜻,김국진,석소희,김철경,임진환,유재봉,장윤영,Oh, Seung-Taek,Oh, Cham-Teut,Kim, Guk-Jin,Seok, So-Hee,Kim, Chul-Kyung,Lim, Jin-Hwan,Ryu, Jae-Bong,Chang, Yoon-Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4
A new type of chemical oxidation technology utilizing micro bubble ozone oxidizer and a pneumatic fracturing equipment was developed to enhance field applicability of a traditional chemical oxidation technology using hydrogen peroxide as an oxidizer for in-situ soil remediation. To find an efficient way to dissolve gaseous ozone into hydrogen peroxide, ozone was injected into water as micro bubble form then dissolved ozone concentration and its duration time were measured compared to those of simple aeration of gaseous ozone. As a result, dissolved ozone concentration in water increased by 31% (1.6 ppm ${\rightarrow}$ 2.1 ppm) and elapsed time for which maximum ozone concentration decreased by half lengthened from 9 min to 33 min. When the developed pneumatic fracturing technology was applied in sandy loam, cracks were developed and grown in soil for 5~30 seconds so that the radius of influence got longer by 71% from 392 cm to 671 cm. The remediation system using the micro bubble ozone oxidizer and the pneumatic fracturing equipment for field application was made and demonstrated its remediation efficiency at petroleum contaminated site. The system showed enhanced remediation capacity than the traditional chemical oxidation technology using hydrogen peroxide with reduced remediation time by about 33%.
신현진(Shin, Hyun Jin),오참뜻(Oh, Chamteut),이광헌(Lee, Gwanghun),박준범(Park, Junboum) 한국연안방재학회 2014 한국연안방재학회 학술발표대회 논문집 Vol.2014 No.-
항만 준설, 유지 준설 및 최근 4대강 정비사업 등으로 인하여 상당히 많은 양의 준설토가 발생하였다. 그런데 일부 준설토의 경우 토양 오염 기준을 상회하는 중금속 함량을 나타내고 있어 이에 대한 처리가 필요하다. 본 연구에서는 오염준설토의 정화를 위한 새로운 토양세척 시스템을 개발하였으며, 이는 특히 준설의 특성을고려하여 기존의 토양세척 시스템과는 다르게 연속식으로 구성했다는 특징을 갖고 있다. 시스템 내 준설토는 첫 번째 단계로 고함수의 준설토가 이송 과정에서 세척제와 혼합되는 과정을 거치며, 두 번째 단계에서는 혼합되어 형성된 슬러리가 4,000 psi 이상의 초고압수와 충돌하여 물리적 충격 및 난류에 의한 혼화 효과가 나타나게 된다. 세 번째 단계에서 혼합된 슬러리를 고액분리하여 최종적으로 정화된 토양을 획득할 수 있다. 본 논문에서는 시스템에 대한 개요 소개, 장치 소개, 실험 방법 및 그에 대한 결과를 기술하였다.