• Nuclear Engineering and Technology
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• 제47권7호
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• pp.859-866
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• 2015

The aim of this work is to investigate the transport mechanism of radioactive nuclides through the reverse osmosis (RO) membrane and to estimate its effectiveness for nuclide separation from radioactive liquid waste. An analytical model is developed to simulate the RO separation, and a series of experiments are set up to confirm its estimated separation behavior. The model is based on the extended Nernst-Plank equation, which handles the convective flux, diffusive flux, and electromigration flux under electroneutrality and zero electric current conditions. The distribution coefficient which arises due to ion interactions with the membrane material and the electric potential jump at the membrane interface are included as boundary conditions in solving the equation. A high Peclet approximation is adopted to simplify the calculation, but the effect of concentration polarization is included for a more accurate prediction of separation. Cobalt and cesium are specifically selected for the experiments in order to check the separation mechanism from liquid waste composed of various radioactive nuclides and nonradioactive substances, and the results are compared with the estimated cobalt and cesium rejections of the RO membrane using the model. Experimental and calculated results are shown to be in excellent agreement. The proposed model will be very useful for the prediction of separation behavior of various radioactive nuclides by the RO membrane.

• 한국재료학회지
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• 제33권4호
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• pp.151-158
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• 2023

In this study, a new type of composite material combined with carbonyl iron, a relatively strong ferromagnetic material, was prepared to overcome the current application limitations of Prussian blue, which is effective in removing radioactive cesium. The surface of the prepared composite was analyzed using SEM and XRD, and it was confirmed that nano-sized Prussian Blue was synthesized on the particle surface. In order to evaluate the cesium removal ability, 0.2 g of the composite prepared for raw cesium aquatic solution at a concentration of 5 ㎍ was added and reacted, resulting in a cesium removal rate of 99.5 %. The complex follows Langmuir's adsorption model and has a maximum adsorption amount (q_e) of 79.3 mg/g. The Central Composite Design (CCD) of the Response Surface Method (RSM) was used to derive the optimal application conditions of the prepared composite. The optimal application conditions achieved using Response optimization appeared at a stirring speed of pH 7, 17.6 RPM. The composite manufactured through this research is a material that overcomes the Prussian Blue limit in powder form and is considered to be excellent economically and environmentally when applied to a cesium removal site.

• 공업화학
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• 제29권2호
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• pp.127-137
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• 2018

후쿠시마 다이치 핵발전소의 사고 이후 방사능 오염이 중요한 환경 관심사가 되었다. 원자량 134와 137 세슘은 주요 핵분열 산물이며, 이물질들은 방사능 오염의 주된 문제들이다. 후쿠시마 다이치 핵 발전소 사고에서 다량의 세슘이 방출되었으며, 이 사고의 결과, 많은 연구자들이 방사능-독성 세슘 제거를 위한 흡착제 개발에 집중하였다. 본 총설에서는 세슘 제거를 위하여 각광을 받는 물질로서 청색 안료와 이와 유사한 화합물 제조의 최근 발전 동향을 자세하게 검토하였다. 또한, 다양한 형태의 점토와 점토 기반 흡착제 및 새로 개발된 흡착제를 이용한 세슘 흡착의 최근 연구들을 고찰하였다.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2019년도 춘계학술논문요약집
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• pp.299-300
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• 2019

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2018년도 추계학술논문요약집
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• pp.392-393
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• 2018

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2018년도 추계학술논문요약집
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• pp.325-326
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• 2018

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2017년도 춘계학술논문요약집
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• pp.67-68
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• 2017

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2017년도 춘계학술논문요약집
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• pp.102-103
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• 2017

• Journal of Radiation Protection and Research
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• 제41권4호
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• pp.350-353
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• 2016

Background: Various characteristics such as size distribution, chemical component and radio-activity have been analyzed for radioactive aerosols released from Fukushima Daiichi Nuclear Power Plant. Measured results for radioactive aerosols suggest that the potential transport medium for radioactive cesium was non-sea-salt sulfate. This result indicates that cesium isotopes would preferentially attach with sulfate compounds. In the present work the attachment behavior of fission products to aqueous solution aerosols of sodium salts has been studied using a generation system of solution aerosols and spontaneous fission source of $^{248}Cm$. Materials and Methods: Attachment ratios of fission products to the solution aerosols were compared among the aerosols generated by different solutions of sodium salt. Results and Discussion: A significant difference according as a solute of solution aerosols was found in the attachment behavior. Conclusion: The present results suggest the existence of chemical effects in the attachment behavior of fission products to solution aerosols.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2004년도 학술논문집
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• pp.13-23
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• 2004

동전기적방법을 사용하여 TRIGA 연구용 원자로 주변 세슘 및 코발트제거 특성을 분석하고 토양컬럼 내의 pH 상승을 제거할 수 있는 방안을 제시했다. 전기장을 높이기 위해 NaCl 용액이 전해질로 사용되었을 때, 토양컬럼 음극주변에 침전물이 형성되어 낮은 제거효율을 나타냈다. 그래서, pH의 상승을 억제하기 위해 초산완충액을 토양컬럼에 주입하고, 초산을 주기적으로 음극저수조에 주입했다. 초기제염기간 동안 전기삼투보다는 전기이동에 의해 많은 세슘과 코발트가 제거되었다. 토양컬럼 내의 총 세슘 중 96%가 5.9 일 동안 제거되었고, 총 코발트 중 94%가 제거되었다. 또한, 개발된 모델에 의한 시뮬레이션 결과는 실험결과와 거의 일치했다.