• 환경영향평가
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• 제17권5호
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• pp.271-278
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• 2008

The purpose of this research provides the basic solution about waterfront and promotes the inherent capability, that recoveries both the river and gives the river for water quality to improve plan. In this study, we compare and analysis the slope contact between filter media of the porous concrete and planting concrete. As a result, when appling the porous concrete, it can show the removal efficiency is SS 53%, BOD 39%, COD 20%, T-N 36% T-P 42% and appling planting concrete is SS 58%, BOD42%, COD 26%, T-N 45%, T-P 53%. Therefore, planting concrete is higher removal efficiency (SS 5%, BOD 3%, COD 6%, T-N 9%, T-P 10%) than porous concrete. The experimental results show that using purification filter media on planting concrete is better than on porous concrete, because it have the higher purification filter efficiency. The quality of water improves vegetarian concrete, that can expect the increase of the self-purification capacity and improve the spectacle for providing the waterside and planting of planting concrete. In addition, it can complete and apply the research if having enough time for experimentation and accurate study for mechanism by plant, we can use both planting concrete filter media and the existing dike. As a result, we can gain the better quality of the water of the city's rivers and good economic value, that is spread by all cities applicable technologies. So it can be expected using well for future.

• 분석과학
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• 제13권1호
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• pp.96-100
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• 2000

제올라이트를 사용하여 폐수로부터 중금속 원소들을 제거하기 위하여 조건을 변화시키며 흡착 특성을 조사하였다. 시험한 원소는 독성이 강하여 중금속 오염과 관련이 많은 Cd, Cr, Cu, Pb의 네 가지 중금속 원소들을 선택하였다. 흡착에 영향을 주는 요소로서 제올라이트의 양, 흡착 시간 그리고 pH를 변화시키며 흡착에 의한 제거 효율을 측정하였다. 중금속 용액 50 mL에 대하여 투입된 제올라이트는 2 g 정도가 경제적인 분량이며, 흡착 시간은 30분 정도 반응시키면 최대 흡착을 얻을 수 있었다. Cr과 Cu는 전반적으로 높은 흡착율을 나타내며 낮은 pH 영역에서는 흡착효율이 보다 증가하였다. Cd와 Pb는 95% 내외의 약간 낮은 흡착율을 보이며, Cd는 pH가 낮으면 흡착율이 감소하는 특이한 경향을 보였다.

• Bulletin of the Korean Chemical Society
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• 제32권12호
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• pp.4253-4257
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• 2011

Sodium dodecyl sulfate-capillary gel electrophoresis (SDS-CGE) and capillary isoelectric focusing (CIEF) were employed to characterize and compare ricin E purified from the small grain seeds of Ricinus communis with ricin D isoform. During the purification of ricin E using ion-exchange and size-exclusion chromatography, SDS-CGE was found to be useful for monitoring the efficiencies of purification steps. SDS-CGE showed that the molecular size of ricin E was not significantly different from that of ricin D, which was confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. CIEF was useful for discriminating ricin E from ricin D based on their isoelectric points (pI). The pI values of ricin E and D were 8.6-8.8 and 7.0-7.4, respectively. This study demonstrates the usefulness of SDS-CGE and CIEF for the characterization of ricin toxins.

• 한국물환경학회지
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• 제22권1호
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• pp.83-90
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• 2006

Performance and operation of BAC in ozone-BAC advanced water treatment process were investigated using the pilot scale test plant built in D water purification plant. The performance was evaluated by the removal efficiencies of DOC, BDOC, ammonia nitrogen and THMs. The effect of EBCT on DOC removal was experimented for an effective operating condition, and the amount of attached biofilm was analyzed in various water temperatures and position of BAC. Two removal mechanisms, adsorption and biological decomposition by attached biofilm, were predominant to decrease the concentration of various contaminants. DOC was removed 40%, and the removal rate was decreased in winter time due to the lowered activity of attached biofilm. BDOC was effectively removed. THMs and ammonia nitrogen were mainly removed not in ozonation process but in BAC. Water temperature deeply influenced in removal efficiency of ammonia nitrogen. The amount of attached biofilm depended on water temperature and height of packed activated carbon column. Considering DOC removal efficiency and design EBCT of commercial BAC plant, the proper EBCT was 12.5 minutes.

• 한국광물학회지
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• 제27권2호
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• pp.97-105
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• 2014

일월탄광에는 산화조, SAPS, 소택지의 3단계 자연정화시설이 설치되어 있으며 갱내수를 모아 정화한 후 주변 하천으로 유출시키고 있다. 일월탄광 갱내수의 pH 값은 계절에 관계없이 2.28-2.42로 낮은값을 나타내지만 산화조를 거치는 동안 pH 값은 6.17-6.53 급격하게 증가한다. 정화시설에 의한 정화효율은 $SO_4$, Mg, Al, Ca, Mn은 각각 약 50%, 40%, 100%, 24%, 59%이다. 갱내수의 Fe는 아주 낮은 값($1.06-1.09mg/{\ell}$)이지만 정화시설을 거치는 동안 100%의 제거효율을 나타낸다. 이와 같이 일월탄광에 설치한 정화시설은 pH 상승과 Fe와 Al의 제거 효율은 높지만 $SO_4$, Mg, Ca, Mn 등은 60% 이하로 상대적으로 낮다. 따라서 이러한 이온을 제거하기 위해서는 다른 정화기술을 적용해야 할 것으로 판단된다. pH 2.28-2.42 범위인 갱내수가 유입되는 정화시설 바닥에 침전되는 침전물은 슈워트마나이트이며 ($Fe_8O_8(OH)_6SO_4$), pH 5.83-5.96인 침출수에서는 2-line 페리하이드라이트(2-line $Fe_2O_3{cdot}0.5H_2O$H2O)가 침전된다.

• 한국화재소방학회논문지
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• 제29권4호
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• pp.57-60
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• 2015

화재 시 발생하는 독성 가스인 CO, HCl, HCN, $SO_2$를 방독면에 의해 제거하는 효율은 화재로 인한 인명구조의 핵심 요소이다. 머리와 목끈이 없는 탄력있는 방독면은 전방을 주시할 수 있는 창, 탄력후드, 가스정화기와 공기 환풍구로 되어 있어서 화재 시 빠르고 쉽게 착용할 수 있다. 이 연구에서는 이러한 방독면의 CO, HCl, HCN, $SO_2$ 제거 효율에 대한 연구를 진행하였다. 실험결과 CO 제거 효율은 최초 농도가 2505.0 ppm인 경우 3.5분 후에 99.99%였고, 8.5분 후에는 99.98%로 나타났다. 8.5분 후에는 CO 농도가 급격히 증가하는 특성을 보였다. HCl, HCN, $SO_2$에 대해서는 최초 농도가 각각 1003.0, 399.0, 100.3 ppm인 경우 20분 동안 제거 효율이 100%로 나타났다.

• 한국농공학회논문집
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• 제56권6호
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• pp.85-91
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• 2014

In this study, the water quality purification of new medias which were NPS media, hyugato, mineral stone, charcoal for applying soil media of Integrated Management Practices (IMPs) of Low Impact Development (LID) were evaluated. The influent concentrations of COD, T-N, and T-P were 117.8 mg/L, 17.1 mg/L, and 2.062 mg/L, respectively. The infiltration capacities of NPS media, hyugoto, mineral stone, charcoal, and gravel were $7.1{\times}10m/s$, $7.3{\times}10^{-5}m/s$, $7.9{\times}10^{-5}m/s$, $6.0{\times}10^{-5}m/s$, respectively. All media meet criteria of infiltration capacity as surface soil layer at IMPs which is over $1.0{\times}10^{-5}m/s$. Maximum removal rates of COD, T-N, and T-P occurred at Charcoal with 98 % of COD removal rate, NPS with 78 % of T-N removal rate, and hyugato with 75 % fo T-P removal rate, respectively. For more high removal efficiency of all water quality item, the mixed media which is 4.5(NPS media): 1(charcoal) : 4.5 (hyugato) as volume ratio was evaluated. The infiltration capacity of mixed media was $7.9{\times}10^{-5}m/s$ and met the criteria of infiltration as surface soil layer. The water quality removal efficiencies of mixed media were very high with showing 70 % for COD, 85 % for T-N, and 71 % for T-P. The mixed media could purify the water quality of surface runoff and was recommended to used at the LID site of ground water quality problem.

• KSBB Journal
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• 제15권4호
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• pp.408-410
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• 2000

생리활성물질의 함유량이 많은 아가리쿠스버섯으로부터 초임계 유체 추출 기술을 이용하여 비극성 생리활성물질인 linoleic acid를 분리, 정제하였다. Gas chromatography - mass spectrometer를 이용하여 추출된 물질의 정성분석을 수행하여 추출된 물질은 약리작용 효과를 가지는 linoleic acid (cis-9, cis-12-octadecadienoic acid)로 분석되었다. 초임계 추출법을 이용한 아가리쿠스 버섯으로부터의 생리활성물질 추출공정의 최적화를 위하여 다양한 온도와 압력하에서 실힘을 수행하였으며 추출 효율을 비교한 결과 $50^{\circ}C, 200 kg_f/cm^2$의 최적 운전조건을 결정하였다.

• 동력기계공학회지
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• 제7권3호
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• pp.12-17
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• 2003

The purpose of this study is to observe the purification characteristics of NOx, CO and HC in various catalysts and excess air ratio conditions. For this purpose, we installed various catalysts on the back stream of the coaxial diffusion burner with swirler. As the result, in the case of NOx, Pt-Rh catalyst shows very high value that is more than 90%-conversion efficiency without the relation with the excess air ratio. After excess air ratio of ${\alpha}=1.14$, it shows that the conversion efficiencies were more than 80% in the every Pt catalyst in the view of conversion of every exhaust with changing of the excess air ratio.

• 한국물환경학회지
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• 제22권3호
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• pp.456-461
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• 2006

The facility of constructed wet land combined with filter media was examined in order to improve the water quality of a polluted stream, which has been performed as a part of national projects. Throughout 2 years of operation for a stream, it can provide the design and operating parameters for the purpose of future construction. The influent flow rate was about 50% against the design capacity. The removal efficiencies of BOD, $COD_{Mn}$, SS, T-N and T-P were 62.9%, 47.1%, 74.8%, 22.4% and 33.5%, respectively. In order to keep this facility stable, the removal of surface filter media and supplement should be periodically conducted. In addition, the proper selection of sites is recommended not to be flooded.