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최명찬(Ming-Can Cui),임정현(Jung-Hyun Lim),예의평(Yeaui Phyung),장민(Min Jang),심연식(Yon-Sik Shim),김지형(Jee-Hyeong Khim) 한국토양비료학회 2008 한국토양비료학회지 Vol.41 No.5
A coal mine drainage sludge(designated as CMDS) is mainly generated during physicochemical treatment or electrical purification of the drainage abandoned mine that include dissolved heavy metal. To understand the possibility of an application of the dehydrated CMDS as the landfill cover medium of hygienic a reclaimed ground, an laboratory experiment was performed to investigate the physicochemical and geoengineering characteristics of the dehydrated CMDS. To improve the geoengineering characteristics of the dehydrated CMDS, the liquid limit, plasticity limit test, compaction method test, strength test, and hydraulic conductivity test ware performed with the lithification material mixed sludge. When the mixed ratio of the sludge and the lithification material was more than 1:06, the compaction method was A method, the moisture content less than 33.5%, the strength of mixed sludge was 8.2 kg cm<SUP>-2</SUP>, the hydraulic conductivity was 2.7×10<SUP>-6</SUP> cm sec<SUP>-1</SUP>, the sludge was up to the landfill standard of US Environmental Protection Agency (US EPA).
석탄광산배수슬러지를 이용한 액상상태의 비소제거 흡착특성 및 반응속도에 관한 연구
이세반 ( Se Ban Lee ),최명찬 ( Ming Can Cui ),장민 ( Min Jang ),문덕현 ( Deok Hyun Moon ),조윤철 ( Yun Chul Cho ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.2
In this research, equilibrium of adsorption and kinetics of As(V) removal were investigated. The coal mine drainage sludge(CMDS) was used as adsorbent. To find out the physical and chemical properties of CMDS, XRD (X-ray diffraction), XRF (X-ray fluorescence spectrometer) analysis were carried out. The CMDS was consist of 70% of goethite and 30% of calcite. From the results, an adsorption mechanism of As(V) with CMDS was dominated by iron oxides. Langmuir adsorption isotherm model was fitted well more than Freundlich isotherm adsorption model. Adsorption capacities of CMDS 1 was not different with CMDS 2 on aspect of amounts of arsenic adsorbed. The maximum adsorption amount of two CMDS were respectively 40.816, 39.682 mg/g. However, the kinetic of two CMDS was different. The kinetic was followed pseudo second order model than pseudo first order model. Concentrations of arsenic in all segments of the polymer in CMDS 2 does not have a constant value, but the rate was greater than the value of CMDS 1. Therefore, CMDS 2, which is containing polymer, is more effective for adsorbent to remove As(V).
탄광슬러지를 이용한 금속광산 산성배수 처리 시 pH및 온도의 영향
최명찬,임정현,권보연,장민,심연식,김지형,Cui, Ming-Can,Lim, Jung-Hyun,Kweon, Bo-Youn,Jang, Min,Shim, Yon-Sik,Khim, Jee-Hyeong 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.1
본 연구에서는 석탄광산 배수(CMD)를 전기정화법으로 처리 시 발생되는 슬러지를 흡착제로 금속광산 산성배수(AMD)중 중금속 처리 시 pH와 온도변화에 따른 중금속 흡착 거동을 연구하고자 하였다. 실험결과 CMDS의 pH$_{zero\;point\; charge}$:(pH$_{zpc}$)는 5로 나타났다. pH영향의 경우 구리, 아연, 카드뮴, 철은 pH 증가에 따라 제거율은 증가하였고, 구리의 경우 흡착량은 pH와 상관없이 0.64 mg g$^{-1}$ sludge로 나타났다. pH 5 이상일 때 기타 중금속 흡착량은 pH3일 때의 1.1 배로 나타났고 크롬의 경우 pH 7 이상에서 다소 증가하였는데 이는 크롬이 $Cr(OH)_{6}^{3-}$형태로 미량 용출되었기 때문이다. 온도의 영향에서 pH3일때 온도증가에 따라 중금속 흡착량은 증가하였고, 선택도Cd>Fe>Zn>Cu순으로 나타났다. pH 5이상에서 최대 흡착량(q$_{max}$)은 Cu와 Zn의 경우 각각 2.747mg g$^{-1}$와 2.525mg g$^{-1}$로 더 이상의 흡착이 일어나지 않아 온도의 영향을 받지 않은 것으로 판단된다. In this study, the effect of pH and temperature on the adsorption behavior of acid mine drainage (AMD) on coal mine drainage sludge (CMDS) has been investigated during the treatment of coal mine drainage (CMD) by electrical purification method. The pH$_{zero\;point\;charge}$ (pH$_{zpc}$) of CMDS was 5. The removal ratio of copper, zinc, cadmium, iron were increased according to the increase of pH value. The adsorption amount of copper showed 0.64 mg g$^{-1}$ sludge. It was independent of pH value. The adsorption amount of the other metals showed l.l times when pH was 3. The adsorption amount of chromium was a little bit increased at the pH value higher than 7 due to a small amount of the chromium was eluted as $Cr(OH)_6^{3-}$. The amount of metals' absorption were decreased according to temperature was increase at pH value was 3. The selectivity order was Cd>Fe > Zn > Cu. The amount of absorption showed q$_{max}$ Cu 2.747 mg g$^{-1}$ andZn 2.525 mg g$^{-1}$ when pH value higher than 5. It was independent of temperature.
CPCs를 이용한 TiO₂ 광촉매반응공정에서 초기 pH와 촉매농도가 클로로포름 분해에 미치는 영향
조상현(Sang Hyun Cho),최명찬(Ming Can Cui),남상건(Sang Geon Nam),정희숙(Hee Suk Jung),김지형(Jee Hyeong Khim) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.12
본 연구에서는 Compound parabolic concentrator reactor system을 이용하여 초기농도 10 mg/L의 클로로포름을 광촉매반응으로 처리하였다. 1000 W의 메탈할라이드 방전램프를 인공태양광원으로 사용하였으며 약 99%의 클로로포름이 광촉매반응에 의하여 90분 안에 제거되어 먹는물 수질기준인 0.08 mg/L을 만족하였다(pH 5.24, TiO₂ 농도 0.2 g/L). 또한 초기 pH와 TiO₂ 농도가 클로로포름의 분해에 미치는 영향을 알아보기 위해 pH 4, 5, 6, 7과 TiO₂ 농도 0.1, 0.2, 0.4의 조건에서 실험을 수행하였으며, 각 pH 에서의 TiO₂ 입자크기(particle size)와 비표면적(specific surface area)을 측정하여 클로로포름 분해율과 비교하여 비표면적과 광촉매반응 활성 사이의 상관관계를 규명하고자 하였다. 그 결과 pH와 TiO₂ 농도에 따른 클로로포름 분해율은 큰 차이를 보이지 않았다. 하지만 pH에 따라 TiO₂의 입자크기분포(particle distribution)와 비표면적이 변했고 pH 7은 다른 pH 영역보다 비표면적이 약 2배 정도 작은 결과를 보였다. 본 연구의 결과를 바탕으로 클로로포름의 광촉매반응은 TiO₂의 비표면적과 상관관계가 없는 TCE-type인 것을 유추할 수 있었다. To evaluate the solar photocatalytic degradation efficiency of chloroform in a real solar-light driven compound parabolic concentrators (CPCs) system, TiO₂ was irradiated with a metalhalide lamp (1000 W), which has a similar wavelength to sunlight. The results were applied to a pilot scale reactor system by converting the data to a standardized illumination time. In addition, the effects of initial pH and the TiO₂ dose on the photocatalytic degradation of chloroform were investigated. The results were compared with the specific surface area (S.S.A) and particle size of TiO₂, which changed according to the pH, to determine the relationship between the S.S.A, particle size and the photocatalytic degradation of chloroform. The experiment was carried out at pH 4~7 using 0.1, 0.2, 0.4 g/L of TiO₂. The particle size and specific surface area of TiO₂ were measured. There was no significant difference between the variables. However, pH affects the particle size distribution and specific surface area of TiO₂. Inaddition, the activation of a photocatalyst did not show a linear relationship with the specific surface area of TiO₂ in the photocatalytic degradation of chloroform.
파 에너지 (자외선, 초음파)/과황산나트륨을 이용한 이부프로펜 분해특성 연구
나승민 ( Seung Min Na ),안윤경 ( Yungyong Ahn ),손영규 ( Ming Can Cui ),김지형 ( Young Gu Son ),( Jeeh Yeong Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.5
In this study, ibuprofen(IBP) degradation by the photochemical (UV/S2O82-) and sonochemical (US/S2O82-) processes was examined under various parameters, such as UV (10~40±5 W/L) and US (50~90±5 W/L) power density, optimum dosage of persulfate ion (S2O82-), temperature (20~60℃) and anions effect (Cl-, HCO3-, CO32-). The pseudo?first?order degradation rate constants were in the order of 10-1 to 10-5 min-1 depending on each processes. The synergistic effect of IBP degradation in UV/S2O82- and US/S2O82- processes could investigated, due to the generation of SO4- radical. This result can confirm from the produced H2O2 and SO42- concentration in each processes. IBP degradation rate affected by the S2O82- dosage, temperature, power and anion existence parameters. In particular, IBP degradation rate increased with the increase of the temperature (60℃) and applied power density (UV:40±5 W/L, US:90±5 W/L). On the other hand, anions effect on the IBP degradation was negative, due to the anion play as a the scavenger of radical.
혼합된 고급산화공정(AOPs)을 이용한 내분비계장애물질(DEP, NP)의 분해특성 연구
나승민 ( Seung Min Na ),안윤경 ( Yung Yong Ahn ),최명찬 ( Ming Can Cui ),조상현 ( Sang Hyun Cho ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.2
Diethyl phthalate (DEP) and nonylphenol (NP) are widely spread in the natural environment as an endocrine disruption chemicals (EDs). Therefore, in this study, ultrasound (US) and ultraviolet (UVC), including TiO2, as advanced oxidation processes (AOPs) were applied to a DEP and NP contaminated solution. When only the application of US, the optimum frequency for significant DEP degradation and a high rate of hydrogen peroxide (H2O2) formation was 283 kHz. We know that the main mechanism of DEP degradation is radical reaction and, NP can be affected by both of radical reaction and pyrolysis through only US (sonolysis) process and combined US+UVC (sonophotolysis) process. At combined AOPs (sonophotolysis/sonophotocatalysis) such as US+UVC and US+UVC+TiO2, significant degradation of DEP and NP were observed. Enhancement effect of sonophotolysis and sonophotocatalysis system of DEP and NP were 1.68/1.38 and 0.99/1.17, respectively. From these results, combined sonophotocatalytic process could be more efficient system to obtain a significant DEP and NP degradation.