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김영배,조을훈,장윤영,신민철,이희수,최덕균,Kim, Yeong-Bae,Jo, Eul-Hun,Jang, Yun-Yeong,Sin, Min-Cheol,Lee, Hui-Su,Choe, Deok-Gyun 한국재료학회 2002 한국재료학회지 Vol.12 No.2
The optimum condition for fabricating cordierite disc type filter element was deduced. Cordierite monolith was used as starting material for filter element because it has many advantages such as high thermal shock resistance and good catalytic activity compared with $TiO_2$and SiC. The contents of organic additives and foaming agent were optimized to control the porosity and mechanical strength of cordierite filter. Among the required properties to be adopted as filter elements, the pressure drop and NOx removal efficiency were investigated depending on processing variables. It was found that pressure drop depends on particle size distribution of cordierite monolith and organic additives added as forming agent. The pressure drop at 5cm/sec of face velocity was in the range of 15~655mm$H_2O$ at room temperature. The NOx removal efficiency of catalytic filter with $V_2O_5$ as catalyst was over 85% at $450^{\circ}C$.
토착 야초류(어저귀, 자귀풀)의 수경재배를 이용한 2,4,6-trinitrotoluene(TNT) 분해 연구
권영석 ( Kwon Yeong Seog ),김동일 ( Kim Dong Il ),정연규 ( Jeong Yeon Gyu ),배범한 ( Bae Beom Han ),이인숙 ( Lee In Sug ),장윤영 ( Jang Yun Yeong ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.1
In this study, uptake and translocation of 2,4,6-trinitrotoluene(ThT) by plant in a hydroponic culture was quantified with two indigenous plant species, Aeschynomene indica and Abutilon avicennae on various initial concentrations of TNT ranging from 20 to 80 ㎎TNT/L. Experiments were sterilized to exclude the activity of microorganisms and conducted in duplicate. Weight loss of two plant species in added TNT culture media was higher than in control. At over 20㎎TNT/L, there appeared to be phytotoxicity from TNT as indicated by severe yellow-chlorosis and increase of falling leaves. TNT removal rate normalized(K) to the plant fresh weight of Abutilon avicennae and Aeschynomene indica was that the higher TNT concentrations resulted in lower TNT removal rate normalized(K) to the plant fresh weight. Approximately 96% of the TNT in viable microflora-hydroponic culture was removed after 96h of the experiments.
Phytoremediation 모형 적용을 통한 TNT와 ADNT의 거동 특성 연구
성기준 ( Seong Gi Jun ),장윤영 ( Jang Yun Yeong ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.6
The fate and transport of trinitrotoluene (TNT) and its metabolites, amino-dinitrotoluene (ADNT) that can be produced by sequential reactions in phytoremediation were investigated using a two-region phytoremediation model. The data acquired from the experiments conducted for 50 days at Indian mallow planted soil whose top 20 ㎝ of 1 m PVC column was packed with TNT contaminated soil at concentration of 126 ㎎/㎏, were used for model applications. Although the results showed that increase of microbial activity in the planted soil could enhanced degradation of TNT and ADNT, the decrease of mass transfer rate between soil water and solid phases was also observed. Therefore, bioavailability in soil was believed to be an important factor affecting the overall fate of TNT and its metabolites. The enhanced degradation due to increased microbial activity, decreased mass transfer rate due to the root exudates, and contaminant retardation due to root water uptake suggested that phytoremediation could play an important role for reducing TNT and its metabolites leaching to the ground water and/or nearby water system.
제강분진을 이용한 4-Chlorophenol의 펜톤유사 산화반응
이웅 ( Lee Ung ),이성재 ( Lee Seong Jae ),박규홍 ( Park Gyu Hong ),배범한 ( Bae Beom Han ),장윤영 ( Jang Yun Yeong ),장윤석 ( Jang Yun Seog ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.4
The objective of this research was to investigate the role of steelers` dust as a catalytic reagent in H₂O₂/steelers` dust system. In acidic condition, FeO and Fe₂O₃ in steelers` dust could be dissociated to produce ferrous ion and ferric ion, which reacted with hydrogen peroxide to produce hydroxyl radicals and then degrade 4-chlorophenol. The batch experiments showed that 0.51 5mM 4-chlorophenol and its oxidation intermediates could be totally decomposed within 60 minutes by 1g/L steelers` dust and 0.485mM hydrogen peroxide at pH 2.7. The removal of 4-chlorophenol in H₂O₂/steelers` dust system was affected by the concentration of hydrogen peroxide rather than the dose of steelers` dust. The rate constants in the simplified kinetic model proposed in this study were estimated by fitting to the experimental data obtained in H₂O₂/steelers` dust system. Using the estimated kinetic rate constants, the simulation of 4-chlorophenol, ferrous iron, hydrogen peroxide, and hydroxyl radical concentration was performed. The predicted concentrations of 4-chlorophenol and hydrogen peroxide corresponded to the actual concentrations. The concentration of ferrous iron tended to be underestimated while that of hydroxyl radical was overestimated by the proposed model. For the experimental conditions conducted in this study, a value of 0.3mM hydroxyl radical could be suggested to calibrate the overestimated prediction.