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1
칼슘 침전처리에 의한 인산폐수 재사용에 관한 연구

김영임,김동수,Kim Yaung-Im,Kim Dong-Su 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.4
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인산염은 유기물의 성장에 필요한 중요한 영양물질이나 아주 미량이 필요하여 폐수 중의 인산염은 오염물질로 작용하며 수생 생태계에 영향을 미친다. 따라서 고농도의 인산염에 대하여 칼슘을 이용한 침전법를 사용하여 인산염의 제거에 관한 연구를 수행하였으며 폐수의 재이용 방면에 대해 고찰하였다. 인산염의 침전 제거 시 pH 조건은 pH 6에서 pH 12로 고려하였는데, pH 12에서 가장 좋은 효율을 나타내었다. 또한 인산염은 침전반응에 의하여 칼슘을 침전반응 당량비의 0.5배 투입한 경우까지 제거율이 급격히 증가하는 경향을 나타내었으며 인산염의 잔존량은 0.0027 mM 까지 낮추는 효과를 가져왔다. 불소가 오염물로 존재하는 상황에서 인산염을 제거하기 위한 실험은 pH 및 농도비에 따라 진행되었으며 pH가 증가할수록 인산염의 제거율은 증가하였다. 또한 인산염 : 불소의 농도비가 증가하여도 인산염의 제거율은 크게 영향을 받지 않은 것이 관찰되었다. Phosphate is an essential material for the growth of organisms. However. since relatively small amount is required. a large amount of phosphate is abandoned in wastes and wastewater. which contaminate the ecological environment including aquatic system. Purpose of this study is to treat especially high concentrated phosphate wastewater by use of calcium precipitation method. The pH range considered was from 6 to 12 and the maximum removal of phosphate was attained at pH 12. The con-centration of phosphate was observed to decrease rapidly until a half amount of calcium ion to its equivalent for the formation of calcium phosphate precipitate was added. which resulted in the decrease of the remaining concentration of phosphate down to 0.0027 mM. The effect of fluoride ion was examined and the concentration ratio between the phosphate and fluoride ion did not have any significant influence on the removal efficiency of phosphate. The effect of pH was also investigated. With the increasing of the pH in solution, the removal rate of phosphate was increased. Also it was investigated that the effect of fluoride on the phosphate removal was not significant.
2
Fabrication of mesoporous titania membrane of dual-pore system and its photocatalytic activity and dye-sensitized solar cell performance

Oh, Seung-Lim,Choi, Kyong-Hoon,Im, Ji-Eun,Wang, Kang-Kyun,Yaung, Hae-Yong,Kim, Kyungkon,Kim, Yong-Rok IOP Pub 2011 Nanotechnology Vol.22 No.27
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We report the fabrication of a novel titania membrane of the dual-pore system that is strategically designed and prepared by a two-step replication process and sol–gel reaction. The primary nanoporous channel structure is fabricated by the cage-like PMMA template (CPT) obtained from the nanoporous alumina membrane and the secondary mesoporous structure is formed by the sol–gel reaction of the lyotropic precursor solution within the CPT. Furthermore the mesoporous titania membrane (MTM) frame consists of the titania nanoparticles of 10–12 nm in diameter. Morphology and structural properties of the MTM are investigated by field emission scanning electron microscopy, high resolution transmission electron microscopy, x-ray diffraction and Brunauer–Emmett–Teller surface area. The photocatalytic activity and the solar energy properties of the MTM are characterized by UV–vis spectrophotometer, spectrofluorometer and photoinduced I–V measurement. The photocatalytic test indicates that the MTM has higher efficiency than the commercial P25 with a good recyclability due to its large-scale membrane style and the preliminary result on the solar cell application shows a solar energy conversion efficiency of 3.35% for the dye-sensitized solar cell utilizing the MTM.
3
LCC를 고려한 KSTAR 냉각수설비의 설계특징 및 성능평가

김영진(Young-Jin Kim),정남용(Nam-Yong Jung),임동석(Dong-Seok Im),김상태(Sang-Tae Kim),김양수(Yaung-Su Kim),유성연(Seong-Yeon Yoo) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
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KSTAR is the final aim that is development of the nuclear fusion power plant to generate the green and stable high-capacity electricity. Most of the components of KSTAR are to obtain the thermal stability by deionized (DI) water. KSTAR performed the plasma experiment annual is used the electric energy of many billions won per year, and the cooling water system (CWS) currently comprise about twenty five percent of the total energy. Therefore, the CWS should be minimized fabrication, operation and maintenance costs. In order to minimize the life cycle cost (LCC), the CWS has design features as following: to classify as a pulse load cooling loop type operated intermittently and a continuous load cooling loop type operated continuously, to apply two-step heat exchanger (HE) in the cooling loops, to install the by-pass pipe between the cooling tower water loops and the chilled water loops for shutdown chillers in winter, to equip a separate small pump system and interface piping because the first neutral beam injection (NBI-1) is carried out the experiment operation at day and the standby unload one, being operation for beamline vacuum, at night, and to fit a 3-way valve and a pre-cooler in a plasma facing component (PFC) nitrogen gas baking system. In operation results, we analyzed the flow stream in a cooling water storage tank and a tower water header, the water temperature state in the two-step HE, and the performance of a polishing system, the NBI-1 cooling system and the PFC nitrogen gas baking system.