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이재엽,이상중,한인섭,Lee, Jai-Yeop,Lee, Sangjung,Han, Ihnsup Korean Society of Soil and Groundwater Environment 2013 지하수토양환경 Vol.18 No.3
Adsorption of melamine was examined using columns packed with granular activated carbon (GAC). Raw GAC was sieved with 20, 40, 60 and 80 mesh to determine the influence of adsorbent particle size on reaction and diffusion. The mass ratio of the adsorption capacity of GAC for melamine ranged from 9.19 to 11.06%, and adsorption rates increased with decreasing particle size within this range. Rate constants between 3.295 ~ 4.799 $min^{-1}$ were obtained using a pseudofirst-order equation that was used to determine adsorption kinetics. A surface diffusion model was adapted to take into account the unsteady-state equation of a spherical adsorbent by converting the surface concentration from a constant to a variable governed by a dispersion equation. The calculated values were fit with the experimental results by using the diffusion coefficients as regression parameters. The modified equation exhibited a more precise agreement with respect to the sum of the absolute error (SAE).
이재엽(Jai Yeop Lee),김일호(Ilho Kim) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.1
본 연구에서는 도로환경에 적용 가능한 통기성 정전필터를 개발하여 흡착능을 평가하였다. 흡착특성은 ASHRAE 52.1, 52.2 등의 방법으로 입경별 제거율과 압력별 흡착량 등을 평가하였다. 평가 입경범위는 0.3 μm~10.0 μm로 12단계로 제거율을 평가하였다. 필터는 2.5 μm 이상에서 91.3%의 제거율을 보였으며 그 미만의 범위에서는 입경에 따라 감소하여 평균 53.5%의 제거율을 보였다. ASHRAE Dust 합성 분진에 의한 중량 제거율은 초기압력 22.6 mmaq에서 말기압력 35 mmaq까지 측정된 결과, 96.7%였으며 이때까지 흡착량은 715.9 g/m²이었다. 압력에 따른 흡착형태는 Langmuir 선도를 보였다. 말기압력까지 흡착된 필터를 물세정으로 1, 2차 재생한 후 흡착을 평가한 결과 제거효율에는 차이가 없었으나 초기압력과 흡착량은 약간의 저하가 발생하였다. In this study, a electrostatic filter which could be applicable to road environment was developed and evaluated in adsorption capacity. The evaluation were performance for removal by particle size and adsorption amount by pressure using ASERAE 52.1 and 52.2. The range of size for removal test was 0.3 μm~10.0 μm which had 12 steps. The filter showed 91.3% removal efficiency from 2.5 μm and under the size, average 53.5% proportional to decreasing size value. The weight removal was 96.7% from 22.6 mmaq, initial pressure to 35 mmaq, end pressure with 715.9 g/m², the adsorption amount. The shape of isotherm was expressed as Langmuir’s one. After washing saturated filter with dust to end pressure, the initial pressure and adsorption amount of the filter showed a light drop with no removal efficiency decline.
중압 자외선과 과산화수소 공정을 이용한 하수 3차 처리수중 총유기탄소와 미량오염물질 제거
이재엽 ( Lee Jai-yeop ),김일호 ( Kim Ilho ) 한국물환경학회 2020 한국물환경학회지 Vol.36 No.4
This study evaluated the applicability of UV-AOP process using medium-pressure UV lamp and H2O2 to remove TOC and emerging micropollutants in the effluent from a sewage treatment plant. The UV lamp with higher output(1.6∼8.0 kW) showed slightly higher amount of power in removing TOC of 1 mg/L(0.09 kWh/mg/L∼0.11 kWh/mg/L), however it was found that there was no significant difference for each cases. In addition, under the condition that the H<sub>2</sub>O<sub>2</sub> concentration is sufficient, as the power consumption of the UV lamp increases, the unit TOC removal concentration per unit H<sub>2</sub>O<sub>2</sub> decomposition concentration also increases, resulting in effective removal of TOC. The removal rate of 7 new trace contaminants, such as antibiotics by the UV-AOP tested, was at least 89.4%, and the ability to remove the emerging micro pollutants in the process was very effective. But, it was judged that it could not be excluded that the probablity of transforming to oxidated by-product in the case of a low TOC removal efficiency. Depending on the operating conditions of the UV and H<sub>2</sub>O<sub>2</sub> processes, a higher BOD concentration is found in the treated water than in the influent, and it is necessary to review the UV power and proper injection conditions of H<sub>2</sub>O<sub>2</sub> to maintain the BOD concentration increase below a certain level.
한강수계 내 Melamine 농도검출과 GAC처리에서의 파과모델링
이상중(Sang Jung Lee),이재엽(Jai Yeop Lee),한인섭(Ihn Sup Han) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.10
현재, melamine은 레진, 내화제, 접착제, 라미네이트 등 우리 생활에 다양하게 사용되고 있다. 그로 인해 melamine이 포함된 폐수의 수계 유입 또한 증가하고 있다. EU안전지침서의 GHS에는 melamine을 암 유발 가능성이 있는 물질로 구분하고 있다. 하지만 아직까지 melamine에 대한 독성연구는 진행 중이며 어떤 영향을 주는지 아직까지 밝혀진 사실이 적다. 본 연구에서는 한강과 주변하천의 melamine 오염 정도를 HPLC/UV를 이용하여 오염 정도를 파악하였다. 그리고 활성탄을 이용한 흡착실험 및 모델링에 관한 연구를 하였다. 우선 한강수계 중 상대적으로 상류에 있는 팔당댐 근교와 그보다 하류지역인 뚝섬유원지에서 동일한 시료를 3개씩 채수하였고 한강에 유입되는 하천 중 홍릉천, 왕숙천, 청계천에서 동일하게 시료를 채수하여 정제 후 melamine 농도를 측정하였다. 그 결과 팔당댐 근교의 시료에서는 melamine이 검출되지 않았으며 그보다 상대적으로 하류인 뚝섬유원지에서는 0.312 μg/L농도가 검출되었다. 왕숙천에는 0.578 μg/L로 가장 높았으며 청계천과 홍릉천은각 0.197 μg/L, 0.325 μg/L로 검출되었다. 전체적으로 낮은 농도지만 대부분의 지점에서 melamine의 검출을 확인할 수 있었다. 1970년대에는 melamine 생산량이 200,000 ton에서 최근에는 1,400,000 ton으로 계속적인 사용의 증가로 수계오염은 심화될것으로 보인다. 활성탄을 이용한 흡착 실험에서는 활성탄 크기에 따라 melamine흡착에 약간의 차이를 보였으나 파과모델과 어느 정도 일치함을 보였다. Currently, melamine is being used variously in our lives such as resins, flame retardants, adhesive, laminate etc. And understandably sewer of stream of wastewater containing Melamine has also increased. GHS (Globally Harmonized System of Classification and Labelling of Chemicals) of EU safety guidelines says that it can cause cancer. Still, study on toxicity of Melamine is going on. In this research, melamine contamination level of the Han River and River Basin was analyzed by HPLC/UV. And the experiments of GAC adsorption were conducted and the model was studied. We collected the 3 same samples at the suburbs of Paldang Dam located in the relative upstream in Han River and Ttukseom amusement park, the downstream region and collected samples equally at the Hongreung stream, Wangsuk stream, Cheonggye stream among streams flowing into Han River and then measured Melamine concentration after purification. As a result, melamine was not detected at the suburbs of Paldang Dam and it was detected at Ttukseom amusement park, the downstream of it, in the concentration of 0.312 μg/L. The Wangsuk stream with 0.578 μg/L highest Cheonggye stream and Hongreung stream was detected with each 0.197 μg/L and 0.325 μg/L. Although the concentration was low in general, melamine detection could be checked at most point. In 1970, the world capacity of Melamine was estimated at 200,000 ton, with current production estimated to be 1,400,000 ton. Melamine of Han River and rivers flowing into Han River is present at low concentration but pollution will increase in the future due to increase of use. Depending on the size of activated carbon in the experiment were slightly different. But the breakthrough model is almost identical.
수류확산과 초음파와 오존을 이용한 현장 수질 개선 평가
테킬안디넷 ( Andinet Tekile ),김일호 ( Ilho Kim ),이재엽 ( Jai-yeop Lee ) 한국물환경학회 2017 한국물환경학회지 Vol.33 No.2
This study used jet water flow, ultrasonication, and ozonation units to investigate the impact of the unit components on the water quality of the stagnant Yeo-cheon River in Korea. Samples were collected at six locations, before the experiment and at 1, 3, and 6 hrs afterward. By operating the water-flow unit only, dissolved oxygen increased by as much as 90% after 3 hrs, 25 m downstream from the device, and Chi-a was reduced by 80%. With sonication added, more than 80% of the ChI-a was removed, even at 100 m downstream from the device. In addition, total dissolved phosphorus was reduced from an average value of 420 (± to μg/L before ultrasonic irradiation to 160 (±40) \μ/L afterward. By releasing ozone into the flow with sonication, ChI-a was greatly removed from the water column, and ammonia nitrogen also decreased, to an average value of 20 n column 60 μg/L. However, because only 3*10-3 mg/L of ozone was used for safety reasons, and because of its brief reaction time, the effect of integrating ozone into the system covered only a small area. Generally, combining sonication with jet flow is promising for preventing algal bloom formation, because it effectively removed Chi-a from the water column.