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침적형 생물막 반응기와 모래여과지를 이용한 하 . 폐수처리
이해일,부경민,최명원,김창원 ( Hae Ill Lee,Kyung Min Bou,Myung Won Choi,Chang Won Kim ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.1
Submerged Aerobic Biofilm Reactor(SABR) with series was investigated for wastewater treatment of the Pusan Janglim wastewater plants. SABR has obtained high SS removal efficiency which also showed flexible to load change. SABR has gained avg. organic removal rate 12.2gSCOD/㎡·d (1.4㎏TCOD/㎥·d) in stage 1+2. Nitrification was mainly accomplished at stage 1, 2 in that nitrification rate was avg. 2.6gNH₄-N/ ㎡·d (0.2㎏NH₄-N/㎥·d). This system also sustained high VSS conc. 14,111㎎VSS/l (about 177gVSS/㎡·d) in stage 1, as a results, substrate(ogranics, ammonia)removal was completed in stage 1, 2. There was also observed that nitrification rate was influenced by pH change. Those results suggest that SABR combined sand filter applicable in small-scale treatment plants without secondary clarifier.
프리믹스 시멘트의 활용성 분석을 위한 결합재의 혼합방법에 따른 고장도 콘크리트의 물성 분석
한천구,이해일,Han, Cheon-Goo,Lee, Hae-Ill 한국건축시공학회 2009 한국건축시공학회지 Vol.9 No.5
It is important to increase the strength of binders in order to enhance the strength of concrete. However, when the mineral admixture used for high strength concrete is incorporated individually, its dispersibility decreases due to the phenomenon of compaction, which reduces its fluidity and results in insufficient strength being created. To solve this problem, we can pre-mix each binder in advance to disperse a mineral admixture among binders, which will strengthen the fluidity and strength of concrete. Therefore, this study analyzed the properties of high strength concrete depending on the mix method used, to determine the effect of pre-mix cements ranging from W/B 15 to 35%. It was found that the fluidity of pre-mix increased to a level higher than that of individual mix due to its dispersion and ball bearing effect. The air content was slightly decreased from the result of individual mix due to the micro filler effect, which causes fine particles of silica-fume to fill the voids among cement particles, while the setting time of pre-mix was shorter than that of individual mix, because enhanced dispersion of pre-mix affects hydration heat time. The compressive strength of pre-mix increased due to the phenomenon of compaction of gap structure, and the variation of coefficient decreased by 1.69% on average in strength variation. 일반적으로 콘크리트를 고강도화 하기 위해서는 결합재의 강도를 증가시키는 것이 중요하다. 그러나 고강도 콘크리트에 사용되는 광물질 혼화재들이 가진 고결현상으로 인해 개별투입 혼합 시에는 분산성이 크게 저하되어 유동성을 저감시키고, 충분한 강도를 발휘하지 못하는 문제가 발생한다. 이러한 문제를 해결하기 위해 각각의 결합재를 사전에 프리믹스하여 콘크리트를 제조하게 되면 광물질 혼화재가 충분히 결합재 중에 분산되어 콘크리트의 유동성 향상 및 강도증진 등에 기여할 수 있을 것으로 기대된다. 따라서 본 연구에서는 W/B $15{\sim}35%$ 범위내에서 프리믹스 시멘트의 효과를 분석하기 위해 결합재의 혼합방법에 따른 고강도 콘크리트의 물성을 분석하였다. 그 결과 유동성은 프리믹스의 균일분산 및 볼 베어링 효과로 인해 개별혼합보다 양호한 결과를 나타내었고, 공기량은 프리믹스의 시멘트 입자간 공극을 실리카퓸의 미세한 입자가 충전하는 마이크로 필러 효과로 인해 개별혼합 보다 약간 감소하였으며, 응결시간은 프리믹스의 균질한 분산이 수화발열속도에 영향을 주어 개별혼합보다 단축되었다. 압축강도는 프리믹스의 공극구조 치밀화로 인하여 증가하였으며, 강도편차 또한 평균적으로 약 1.69 % 정도 변동계수가 감소하는 효과를 나타내었다.
PLD 공정으로 제조된 LSM-YSZ 나노복합체층이 포함된 경사구조 박막 공기극을 적용한 SOFC의 성능 분석
명두환,홍종일,황재연,이종호,이해원,김병국,조성걸,손지원,Myung, Doo-Hwan,Hong, Jong-Ill,Hwang, Jae-Yeon,Lee, Jong-Ho,Lee, Hae-Weon,Kim, Byung-Kook,Cho, Sung-Gurl,Son, Ji-Won 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
The effect of the application of lanthanum strontrium manganite and yttria-stabilized zirconia (LSM-YSZ) nano-composite fabricated by pulsed laser deposition (PLD) as a cathode of solid oxide fuel cell (SOFC) is studied. A gradient-structure thin-film cathode composed of 1 micron-thick LSM-YSZ deposited at an ambient pressure ($P_{amb}$) of 200 mTorr; 2 micron-thick LSM-YSZ deposited at a $P_{amb}$ of 300 mTorr; and 2 micron-thick lanthanum strontium cobaltite (LSC) current collecting layer was fabricated on an anode-supported SOFC with an ~8 micron-thick YSZ electrolyte. In comparison with a 1 micron-thick nano-structure single-phase LSM cathode fabricated by PLD, it was obviously effective to increase triple phase boundaries (TPB) over the whole thickness of the cathode layer by employing the composite and increasing the physical thickness of the cathode. Both polarization and ohmic resistances of the cell were significantly reduced and the power output of the cell was improved by a factor of 1.6.
김창원,이해일,허남효 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.56 No.-
피혁폐수는 고농도의 슬러지와 유기물, 염분, Cr, 황화물, 질소물을 함유한 폐수로 발생량과 수질의 변동폭이 심해 처리하기가 쉽지 않다. 본 연구에서는 활성슬러지법과 산화처리법의 조합 공정에 의한 피혁폐수내 유기물의 제거가 평가되었다. 연구결과 최대 용적제거율은 CODcr의 경우 HRT 0.7d조건에서 약 1.5kgCODcr/㎥.d였으며, COD(Mn)의 경우에는 HRT 1.4d에서 0.65kgCOD(Mn)/㎥.d으로 나타났다. 활성슬러지법에 의한 방류수질은 398mgCODcr/l까지 낮출 수 있었다. 생물학적 처리와 산화처리를 조합한 공정에서는 H₂O₂400mg/l까지는 투여량 증가에 따라 처리수질이 향상됨을 보였으나 그이상의 투여량에서는 최종 활성슬러지 반응조에서의 MLSS 파괴로 유출수질이 악화되는 것이 관찰되었다. Tannery wastewater contains high concentration of sludge, organics, salinity, chromium, sulphide and nitrogen. Also, due to wide fluctuations of the quantity and quality, the tannery wastewater is difficult to treat. In this study, the organic removal in tannery wastewater was investigated by combined processes composed of activated sludge and chemical oxidation. The results showed that the maximum removal rate was about 1.5kgCODcr/㎥.d under the HRT of 0.7days. In terms of COD(Mn) the maximum removal rate was 0.65kgCOD(Mn)/㎥.d under the HRT of 1.4days. The effluent CODcr was treated up to 398mg/l by activated sludge. In these combined processes the effluent COD was gradually decreased with increasingly the use of H₂O₂ up to 400mg/l in oxidation basin. However, at the higher concentration, the effluent COD in the subsequent biological reactor because higher due to MLSS degradation by excess oxidant.