• Korean Journal of Plant Tissue Culture
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• 제25권4호
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• pp.231-236
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• 1998

Carrot cotyledon explants cultured on MS medium with 1 mg/L 2,4-D were transferred to a hormone-free solid medium overlaid with filter paper in order to elucidate the effect of simple physical treatment on the development and germination of somatic embryos. Transfer of the explants cultured for one week on MS basal medium overlaid with 3 sheets of filter paper on to MS basal medium increased somatic embryo production 2-39 times over the one week culture on medium without filter paper overlay. Maturation and germination of somatic embryos was more prominent on medium overlaid with filter paper than on medium without filter paper. The explants cultured for one week on filter paper overlay added with liquid medium showed prominent decrease in somatic embryo formation compared to filter paper overlay only. It is suggested that the filter paper overlay affected the moisture environment of the somatic embryos developing on it.

• Journal of Korea Water Resources Association
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• 제34권5호
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• pp.459-472
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• 2001

The objective of this study is to evaluate the filtration efficiency of deep-bed filters by comparing to single and dual media filters. Pilot-plant tests using four-filter columns were conducted for the comparison of head loss development and filtered water quality. The dual-media filter showed greater initial head loss, but less rate of head-loss development than those of the coarse-sand-0deep-bed filters. For 180 m/day of filtration rate, the dual-media filter produces larger unit production rate by 30-40%, and the turbidities of filtered water were below 0.1 NTU. The initial breakthrough could be effectively controlled by the dual-media filter rather than coarse-sand-deep-bed filters.

• Nuclear Engineering and Technology
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• 제13권4호
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• pp.254-263
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• 1981

Paper electrophoretic separation of fission products has been carried out by using the specially designed migration apparatus. In general, the isolation of rubidium, strontium, zirconium, ruthenium, cesium, cerium, molybdenum, and some short-lived fission products is more efficient under 0.1M HCl electrolyte as compared with 0.1M NaOH electrolyte. In addition to Np-239, 1-131∼135 were, in particular, observed with different iodine chemical species obtained by the paper-electrophoretic separation of short, neutron-irradiated uranyl nitrate solution.

• 수도
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• 제24권1호통권82호
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• pp.41-47
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• 1997

• Proceedings of the Membrane Society of Korea Conference
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• 한국막학회 1997년도 추계 총회 및 학술발표회
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• pp.107-108
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• 1997

1. 서론 : 분리막 시설의 전처리방법에는 Sand Filter, 유니필터 그리고 케트리지(5$\mu$m) 필터가 상용되어 왔다. 그러나 Sand Filter와 유니필터 등은 설치비용은 저렴하지만 처리수질이 5$\mu$m 케트리지 필터보다 떨어지므로 분리막시설의 전처리로 미흡하다. 통상적인 분리막 시설의 설계시에 사용되는 5$\mu$m 케트리지 필터는 역세가 불가능하므로 교체하지만 대규모의 수처리설비나, SS의 농도가 높은 경우에 있어서 분리막의 전처리시설로 적합치 않다. 한편 5$\mu$m 케트리지 필터는 대체하기 위한 정밀여과장치가 많이 개발되고 있으며 Z필터, BMF, Cross Filter 등이 그러한 여과장치들이다. 본 글에서 소개할 VPMF(Variable Pore Micro Filter, 가변세공 정밀여과장치)도 그러한 여과장치와 유사한 기능과 성능을 가진 정밀여과장치이다. 본 연구에서는 Caolin을 이용하여 50~100ppm 사이의 SS농도하에서 VPMF의 처리수질, 역세효율, SS포집능력 등을 평가해 볼 것이다.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2009년도 학술발표회 초록집
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• pp.381-384
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• 2009

강변여과는 인공함양을 활용한 대체수자원의 대표적 방법으로 하천수를 충적층으로 통과시켜 간접취수함으로써 오염저감과 수질사고 대처 능력의 장점을 가지고 있다. 유럽을 시작으로 많은 선진국에서는 150년 정도의 개발역사를 가지고 있으며, 우리나라에서도 현재 낙동강을 중심으로 강변여과를 활용한 상수도 공급이 이루어지고 있다. 본 논문은 이러한 강변여과 개발을 위한 개발전 개발전략과 적절한 개발위치 선정에 대한 연구로서 게임이론적 접근을 시도하였다. 강변여과 개발을 위한 지자체간 협력 게임이론을 적용함으로써 협력관계를 통한 추가이익 발생이 가능하게 되어 강변여과 개발타당성을 확보할 수 있다. 본 연구에서는 입지 선정에서 대상 후보지의 인자비교를 위한 일부 항목의 자료 유무에 상관없이, 적지분석이 가능한 게임모형을 개발하고 그 적용성에 대해 검토하였다.

• Journal of Korea Water Resources Association
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• 제35권2호
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• pp.213-220
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• 2002

This reserch was focused upon experimental study for wastewater reuse and conducted to evaluate optimum operating conditions of rapid filtration process such as filter flow rate, filtration time and backwashing condition for reuse of secondary-treated effluent using the pilot plant installed in real wastewater treatment plant. Also, the experiment on treatment char-acteristics of coagulant-added activated sludge process was performed to compare with activated sludge succeeded to rapid filtration. As the filtration velocity was 100m/day, the filtration time of the rapid filter connected with activated sludge system was revealed to 40 hours. Backwashing of filter was conducted by water wash and air scour. The optimum backwashing time and backwash flow rate were 10min and 10LPM, respectively. The quantity of backwashing water of the rapid filter was about 2% of total treated water.

• Journal of Korean Society of Environmental Engineers
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• 제35권6호
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• pp.436-441
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• 2013

An experiment using a 5 m-long sand column was performed to evaluate the resisting capability against micro-pollutants of the infiltration gallery, multi-purpose filtration pond and riverbank/bed filtration, of which the filtration distance is becoming increasingly shorter in Korea. Results suggested that the Korean riverbed sand contained significant amount of organics, resulting in a relatively vigorous adsorption of chloride ion on the sand surface. Results also indicated that while phenol was not detected in the column filtrate, both 1,4-dioxane and diazinon were exposed to adsorption by the sand as they moved through the column, decreasing their peak concentrations during the movement. It can be expected that the peak concentrations will diminish significantly in the practical scale due to its longer travel distance.

• 한국상하수도협회지
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• 통권15호
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• pp.120-125
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• 2006

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 1998년도 상수도 공학의 이론과 적용
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• pp.317-372
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• 1998