http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Development of pilot-scale electrokinetic remediation technology to remove 60Co and 137Cs from soil
김계남,Seung-Soo Lee,Dong-Bin Shon,Ki-Won Lee,Un-Soo Chung 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
Pilot-scale electrokinetic remediation equipment suitable to the geological characteristics of South Korean nuclear facility sites was developed for the remediation of radioactive soil. The optimal experiment conditions were chosen through pilot-scale electrokinetic remediation experiments, and the experimental results are presented. The removal efficiencies of Co2+ and Cs+ from artificially contaminated soil after 15 days were 98.4 and 94.9, respectively, and the generated effluent volume was 3.4 ml/g. The removal efficiencies of 60Co and 137Cs by nitric acid were increased by 3.1% and 2.0%more than those by acetic acid. Moreover, when nitric acid instead of acetic acid was used, it had an advantage of a reducing electricity consumption due to its higher electrolytic conductivity. The higher the radioactivity concentration of the soil was, the more the removal efficiencies of 60Co and 137Cs were increased. Namely, the removal efficiencies of 60Co and 137Cs from the soil of high concentrations were increased by 14.4% and 3.8% more than those from the soil of low concentrations. The larger the particle size of the soil was, themore the removal efficiency of 137Cs increased. Namely, the removal efficiency of 137Cs from the soil of an average 1.4 mm particle size was increased by about 2.3% more than that from the soil of an average 0.7 mm particle size. Also, the removal efficiencies of 60Co and 137Cs by the application of an electric current of 15 mA/cm2 were increased by 1.4% and 4.4% more than those by the application of 10 mA/cm2. Therefore, the total removal efficiency of 60Co and 137Cs from the radioactive soil of about 2000 Bq/kg was 95.8% by an electrokinetic remediation by the application of an electric current of 15 mA/cm2 for 55 days. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Precipitation-Filtering Method for Reuse of Uranium Electrokinetic Leachate
Gye-Nam Kim,Dong-Bin Shon,Hye-Min Park,Ki-Hong Kim,Ki-Won Lee,Jeik-kwon Moon 한국방사성폐기물학회 2011 방사성폐기물학회지 Vol.9 No.2
우라늄 오염토양을 동전기제염 시 많은 양의 동전기 침출액이 발생한다. 발생된 우라늄 침출액을 재이 용하기 위한 처리기술이 개발되었다. 동전기제염 시 발생된 우라늄침출액 내의 우라늄농도는 180 ppm이 었고, Mg(II), K(I), Fe(II), Al(III) 농도는 20 ppm∼1,210 ppm이었다. 우라늄침출액의 최적 처리공정은 혼합, 응집, 침전, 농축, 그리고 여과로 구성된다. 침전액의 pH를 11로 맞추기 위해, calcium hydroxide 는 3.0g/100ml 그리고 sodium hydroxide는 2.7g/100ml이 필요했다. 여러 침전실험 결과 NaOH+0.2g alum+0.15g magnetite가 여과를 위한 최적 침전혼합제로 선정되었다. NaOH+0.2g alum+0.15g magnetite 투입 시 침전입자의 평균크기는 600 ㎛이었다. pH=9에서 침전 후 상등액에 총 금속농도가 가 장 낮았기 때문에, 최적 침전을 위하여 먼저 0.2g/100 ml alum와 0.15g/100ml magnetite 투입한 후pH=9일 때까지 sodium hydroxide을 투입하여야 한다
Cho, Hyun,Yang, Dong Won,Shon, Young Min,Kim, Beum Saeng,Kim, Yeong In,Choi, Young Bin,Lee, Kwang Soo,Shim, Yong Soo,Yoon, Bora,Kim, Woojin,Ahn, Kook Jin The Korean Academy of Medical Sciences 2008 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.23 No.3
<P>Mild cognitive impairment (MCI) has been defined as a transitional state between normal aging and Alzheimer disease. Diffusion tensor imaging (DTI) can estimate the microstructural integrity of white matter tracts in MCI. We evaluated the microstructural changes in the white matter of MCI patients with DTI. We recruited 11 patients with MCI who met the working criteria of MCI and 11 elderly normal controls. The mean diffusivity (MD) and fractional anisotropy (FA) were measured in 26 regions of the brain with the regions of interest (ROIs) method. In the MCI patients, FA values were significantly decreased in the hippocampus, the posterior limb of the internal capsule, the splenium of corpus callosum, and in the superior and inferior longitudinal fasciculus compared to the control group. MD values were significantly increased in the hippocampus, the anterior and posterior limbs of the internal capsules, the splenium of the corpus callosum, the right frontal lobe, and in the superior and the inferior longitudinal fasciculus. Microstructural changes of several corticocortical tracts associated with cognition were identified in patients with MCI. FA and MD values of DTI may be used as novel biomarkers for the evaluation of neurodegenerative disorders.</P>
Fabrication of a Cement Waste Form for Final Disposal of Spent Ion Exchange Resins
Yoon-Do Oh,Jong-Sik Shon,Hee-Chul Eun,Chang-Ho Park,Tae-Su Song,Hae-Min Park,Dong-Su Kim,Tack-Jin Kim,Sung-Bin Park 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Spent ion exchange resins have been generated during the operation of nuclear facilities. These resins include radioactive nuclides. It is needed to fabricate them into a stable form for final disposal. Cement solidification process is a useful method for the fabrication of them into a waste form for final disposal. In this study, proper conditions for the fabrication of them into a stable waste form were determined using the cement solidification process. In-drum waste forms were then produced at the conditions, where the stability of representative samples was evaluated for final disposal. The samples were satisfied to the Waste Acceptance Criteria for low and intermediate level radioactive waste disposal sites. This result can be utilized to derive optimal conditions for the fabrication of spent ion exchange resins into a final disposal form.
우라늄 오염 동전기 침출액의 재이용을 위한 침전-여과 방법
김계남,손동빈,박혜민,김기홍,이기원,문제권,Kim, Gye-Nam,Shon, Dong-Bin,Park, Hye-Min,Kim, Ki-Hong,Lee, Ki-Won,Moon, Jeik-kwon 한국방사성폐기물학회 2011 방사성폐기물학회지 Vol.9 No.2
우라늄 오염토양을 동전기제염 시 많은 양의 동전기 침출액이 발생한다. 발생된 우라늄 침출액을 재이용하기 위한 처리기술이 개발되었다. 동전기제염 시 발생된 우라늄침출액 내의 우라늄농도는 180 ppm이었고, Mg(II), K(I), Fe(II), Al(III) 농도는 20 ppm~1,210 ppm이었다. 우라늄침출액의 최적 처리공정은 혼합, 응집, 침전, 농축, 그리고 여과로 구성된다. 침전액의 pH를 11로 맞추기 위해, calcium hydroxide는 3.0g/100ml 그리고 sodium hydroxide는 2.7g/100ml이 필요했다. 여러 침전실험 결과 NaOH+0.2g alum+0.15g magnetite가 여과를 위한 최적 침전혼합제로 선정되었다. NaOH+0.2g alum+0.15g magnetite 투입 시 침전입자의 평균크기는 $600\;{\mu}m$이었다. pH=9에서 침전 후 상등액에 총 금속농도가 가장 낮았기 때문에, 최적 침전을 위하여 먼저 0.2g/100ml alum와 0.15g/100ml magnetite 투입한 후 pH=9일 때까지 sodium hydroxide을 투입하여야 한다. A large volume of uranium electrokinetic leachate has been generated during the electrokinetic decontamination to remove uranium from contaminated soil. The treatment technology for the reuse of the uranium leachate was developed. The concentration of uranium in the generated uranium leachate was 180 ppm and concentrations of Mg(II), K(I), Fe(II), and Al(III) ions ranged from 20 ppm to 1,210 ppm. The treatment process for uranium leachate consisted mainly of mixing and cohesion, precipitation, concentration, and filtration. In order to obtain the pH=11 of a precipitate solution, the calcium hydroxide needs to be 3.0g/100ml and the sodium hydroxide needed to be 2.7g/100ml. The results of several precipitation experiments showed that a mixture of NaOH+0.2g alum+0.15g magnetite was an optimal precipitant for filtration. The average particle size of precipitate with NaOH+alum+0.15g magnetite was $600\;{\mu}m$. Because the total value of metal concentrations in supernatant at pH=9 was the smallest, sodium hydroxide should be added with 0.2g alum and 0.15g magnetite for pH=9 of leachate.