Among many types of flue gas desulfurization (FGD) facilities, wet type FGD using lime or limestone is most popular in the world because of its simplicity of operation and availability of lime and limestone. Seawater desulfurization utilizes the alkalinity of seawater, thus requires no addition of lime and limestone. The efficiency of seawater desulfurization depends on the variation of alkalinity of seawater at different locations. This study presents the effect of gas-water ratio and total alkalinity of absorbing solution on the removal efficiency of sulfur dioxide from the flue gas by means of seawater. Also this study provides an alternative way to increase total alkalinity of seawater by utilizing fly ash from coal-fired power plants. The increase of removal efficiency with increase of alkalinity was measured as 0.26 ± 0.01% per ppm of bicarbonate alkalinity from the set of experiments using seawater, underwater, and distilled water, the alkalinity of which were 111 ppm, 38 ppm, and 1 ppm, respectively. Capability to increase total alkalinity of seawater using fly ash was confirmed.

The mock-up test was carried out to evaluate applicability of unmanned coating method to prevent asbestos scattering from fiber insulation board in same vibration condition of school. Fiber insulation boards were cut into uniform size and attached in checker figure. Bang machine and rubber hammer were used to scatter asbestos sufficiently. Sodium silicate was used as a asbestos scattering inhibitor. The asbestos concentration was counted by PCM (Phase Contrast Microscope) and TEM (Transmission Electron Microscope). Asbestos concentration was 0.014 (1st day) and 0.021 (14th day) f/cm3, respectively in case of without coating. Asbestos concentration was 0.006 (1st day) and 0.008 (14th day) f/cm3, respectively in case of unmanned coating method. It was satisfied the standard of asbestos concentration in indoor air quality management law. So unmanned coating method was applicable to prevent asbestos scattering from fiber insulation board in buildings.

Asbestos contaminated soil remediation was performed depending on wind velocity and water content using a wind remediation treatment device. The soil samples were collected from upland and paddy soil near inactive asbestos mine and 8% wollastonite was applied instead of asbestos due to health hazard. The wollastonite in soil was analyzed by scanning electron microscopy (SEM) combined with energy dispersive spectrometer (EDS). With 8 m/s of wind velocity, 86% and 92.8% of wollastonite in upland soil and paddy soil were releasable, respectively. When distance from air blast module in the device was 1 ~ 1.5 m, the removal efficiency was highly significant. The removal efficiency decreased as increased as the distance. The releasable wollastonite was significantly affected by water content rather than wind velocity, and this tendency was pronounced with paddy soil. With 0% water content, the correlation between distance and residual amount of wollastonite was low, while the removal efficiency of wollastonite was the highest. Consequently, the removal efficiency of wollastonite was increased with high wind velocity and low water content. For the effective asbestos contaminated soil remediation based on this study, controlling equipment for wind velocity and water content requires in pilot-scale plant and additionally enough air injection and sufficient volume of dust collection module are necessary.

Geopolymer foam block was prepared and its characteristics discussed to evaluate the possibility of replacing blastfurnace slag (below BFS) with melting slag in this study. 10~20wt% of BFS was replaced with melting slag. And also10wt% of mine tailing was replaced with fly ash discharged from municipal solid waste incinerator (below MSWI). Thecompressive strength of foam block prepared was similar to that of foam block prepared without replacing BFS. Andalso it was increased by replacing 10wt% of mine tailing with MSWI fly ash. Considering these results, melting slagmay be used instead of BFS without damaging the quality of foam block.

The objective of this study is to assess the structural response and impact energy absorption characteristics of reinforced concrete (RC) and steel plate concrete (SC) barrier walls under missile impact loading considered in the design of NPP (nuclear power plant)'s facilities. The study considered the barrier wall response under external tornado-generated missiles (e.g., steel pipe and automobiles).

본 연구에서는 (주)한국서부발전의 태안화력발전소에서 생산된 비산재로부터 Li의 용출을 고찰하였다. 본 연구에서는, 반응용액:석탄회 비율, 반응용액의 종류(해수, 증류수), CO2가스의 조건에 따른 Li 용출량을 관찰하였다. 실험 결과, 반응용액의 Li 농도는 고체:용액 비율이 증가함에 따라 계속하여 증가하는 양상을 보였다. 비산재 단위 질량당 Li 용출은 증류수를 사용하였을 때, 그리고 CO2가스의 용해가 제한되었을 때 증가되었으며, 이는 그러한 조건에서 CaCO3의 침전이 억제되었기 때문이다. 해수내 Li의 흡착추출에 방해되는 Mg2+도 고체:용액 비를 증가시킴으로써 효과적으로 제거할 수 있었다.

본 연구는 유전자 조작 옥수수의 유전자 유출을 막기 위한 관리방법 개발의 목적으로 고려대학교 GMO 격리포장에서 2010년에 수행된 화분 비산실험의 결과를 이용하여 Yamamura(2004)의 Gamma model로 모델링하였다. 1. 모델의 결정계수는 0.44로 예측치가 실측치를 잘 설명하였다. 2 옥수수 화분의 최대 비산 방향은 북서쪽으로 나타났다. 3. 최대 비산 방향으로 타가수분율이 0.001까지 낮아지는 거리인 '유전자유출 한계거리(0.001)'는 525 m 그리고 국내법상 비의도적 GMO 혼입허용치인 0.03 까지 낮아지는 거리인 '최소 동일작물 재배 한계거리(0.03)'는 35 m로 나타났다.

The effects of meteorological and reclaiming conditions on the reduction of suspended particles are investigated using a computational fluid dynamics (CFD) model with the k-ε turbulence closure scheme based on the renormalization group (RNG) theory. Twelve numerical experiments with different meteorological and reclaiming conditions are performed. For identifying the meteorological characteristics of the target area and providing the inflow conditions of the CFD model, the observed data from the automatic weather station (AWS) near the target area is analyzed. Complicated flow patterns such as flow distortion, horse-shoe vortex, recirculation zone, and channeling flow appeared due to the topography and buildings in the domain. Specially, the flow characteristics around the reclamation area are affected by the reclaiming height, reclaiming size and windbreak height. Reclaiming height affected the wind speed above the reclaiming area. Windbreak induces more complicated flow patterns around the reclaiming area as well as within the reclaiming area. In front of the windbreak, flow is distorted as it impinges on the windbreak. As a result, upward flow is generated there. Behind the windbreak, a secondary circulation, so called, a recirculation zone is generated and flow is reattached at the end of the recirculation zone (reattachment point). At the lower part of the recirculation zone, there is a reverse flow toward the windbreak. Flow passing to the reattachment point starts to be recovered. Total amounts of suspended particles are calculated using the frictional and threshold frictional velocities, erosion potential function, and the number of surface disturbance. In the case of a 10 m-reclaiming and northerly wind, the amount of suspended particles is largest. In the presence of 5 m windbreak, the friction velocity above the reclaiming area is largely reduced. As a result, the total amount of the suspended particles largely decreases, compared to the case with the same reclaiming and meteorological conditions except for the windbreak The calculated suspended particle amounts are used as the emission rate of the dispersion model simulations and the dispersion characteristics of the suspended particles are analyzed.

인도네시아 잠비산 복합 동광석을 대상으로 고품위 동 정광생산을 위한 부유선별 연구를 수행하였다. 본 연구에 사용된 시료는 대부분 탄산염인 공작석으로 이루어져 있으나, 일부 황화동이 존재하여 자연부유도가 높은 황화동을 먼저 부유선별에 의해 회수한 다음, 침강산물로부터 산화동 회수를 위한 공정을 적용하였다. 먼저 황화동 부유선별에서는 잔세이트(xanthate) 계열의 포수제인 AP-211과 AP-242를 1 : 1의 비율로 300 g/t 첨가하고, 광액 pH 6인 조건에서 Cu 품위와 회수율이 각각 57.7%와 9.5%인 동 정광을 얻었다. 그리고 침전된 산물을 대상으로 지방산 포수제인 올레인산을 300 g/t, 기포제 첨가량 50 g/t, 광액 pH 8.0, 그리고 정선횟수 2회인 조건에서 Cu의 품위와 회수율이 각각 30.8%와 92.1%인 결과를 얻었다. 회수된 황화동 및 산화동 정광을 합산한 결과 최종적으로 Cu의 품위와 회수율이 36.1%와 92.7%인 결과를 얻었다.

본 연구에서 실행한 LM 벼의 화분비산 연구는 non-LM벼와 잡초성 벼의 의도치 않은 교잡은 경작지의 생태계에 문제를 야기할 기능성이 커지고 있다. 본 연구는 이를 예방하기 위한 벼의 이격거리 설정을 위하여 수행하였다. 1. 벼의 개화기간의 개화시간(10:00~14:00) 의 주풍은 남풍이었으며, 시간대별 풍속은 0.94~1.77 m/s이었다. 2. 개화기는 LM벼와 Wild벼가 일치하는 기간은 8일이였으며, LM벼와 Wild벼의 최성기는 4일의 차이가 있다. 3. LM벼의 화분이 non-LM벼보다 유의하게 작게 조사되었다. 4. 화분채집량은 위가 노출된 슬라이드 글라스가 위가 덮인 슬라이드 글래스 보다 많았으며 LM벼가 Wild벼보다 비산량이 많았다. 5. 벼 화분의 비산은 오전 10시부터 오후 2시까지 대부분 이루어졌다. 6. 거리에 따른 화분비산량은 1 m까지는 급격히 감소하였으며 2 m이상에서는 서서히 감소하는 전형적인 지수함수를 나타냈으며, 3 m이상에서는 거의 발견되지 않았다.