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Cho, Daechul,Youn, Sang-Hyuk,Rhee, In Hyoung 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
Chemical soil flushing in a packed sandy soil matrix using a natural surfactant. β-cyclodextrin(CD)was investigated via a fluorescence spectroscopy and a dye labeling. The contaminants are lipophilic ring compounds-phenanthrene and naphthalene. Sand type and flushing intensity (rate and concentration) are critical investigation variables. The removal efficiencies were proportional to flow rate, concentration, temperature of the flushing solution and voidity of the sand column. Initial sorption of the surfactant onto the soil matrix was found to be a key step while flow shear was more crucial in the later steps. From time delay experiments before flushing, we speculate that the com-plexation reaction appears to be rate-limiting in non-equilibrium washing schemes.
ATR-FTIR Method for Quantification of Thin Protein Film
Cho, Daechul 순천향대학교 부설 산업기술연구소 2000 순천향 산업기술연구소논문집 Vol.6 No.1
Protein quantification using FTIR-ATR method along with LB deposition and cast film was attempted. A common protein, BSA (bovine serum albumin) and Germanium plate as a film support were used in all the experiments. FTIR-ATR technique identified three characteristic absorption bands for proteins and peptides as amide Ⅰ, amideⅡand -C-N-H stretching. LB technique was more efficient and practical because of its uniformity of the formed film. Calibration results of LB deposition and of cast film were moderately good in case of water based quantification whereas those for phosphate buffered film provided slightly lower proportionality in the calibration due to reduction in the peak intensity and the interference of phosphate ions in IR spectra.
조대철 순천향대학교 부설 산업기술연구소 2000 순천향 산업기술연구소논문집 Vol.6 No.2
A mechanistic growth model with a simple flux-dependent diffusion limitation was proposed in order to investigate bacterial growth and decay on the surfaces of media particles used in biofiltration. The size of media particles was estimated to be slightly dependent on the number of active cells as well as the thickness of the attached cell layers. In the model, the flux ratio was almost constant over time (about 3 days) and the natural cell decay rate would strongly affect on both cell growth and decay. A simulated prediction of cell growth was compared to one of experimental data.
A comparative, kinetic study on cork and activated carbon biofilters for VOC degradation
권성현,Daechul Cho 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.1
Two bio-filters packed with cork, an organic macroporous material and activated carbon, an inorganic microporous one were compared in terms of operative performance on biological degradation of VOC, which was a mixture of benzene, toluene, ethylbenzene and xylene (BTEX) vapors. Two filters were successfully operated for 4 months with three different periods. In general, the bio-filter with packed cork in the long thin glass was distinguishably better than the one with biological activated carbon (BAC). During the first period in which 150 ppm of the gas was flown in at 90 s of empty bed retention time (EBRT), the cork bio-filter performed better except for the first 2 weeks, the biological adaptation phase, which provided the BAC bio-filter with its much greater adsorption capacity as to lead to nearly perfect removal. Despite the shorter breakthrough point for cork, however, the cork bio-filter overwhelmed the BAC after that; even three times higher BTEX load at the shorter EBRT guaranteed the cork filter 90% or more removal. The maximum elimination capacities were 86 g/(m3 h) for the cork and 67 g/(m3 h) for the BAC around 94 g/(m3 h) of inlet load. The higher biomass in the cork column could be resulted from organic surfaces, pore structure with sufficient room for soundmicrobial filmor clumps even though its specific surface area was only 1/12 of BAC. This finding was supported by the model calculation in which the effective surface area of cork bed turned out to be 33% more than that of BAC. The derived relationship between consumption of BTEX and growing cell mass was found to be logarithmically proportional to each other, which was confirmed experimentally in here. We also found that through one-third of the whole length of the packed columns, as much as 79% of the inlet concentration of BTEX gas in the cork bio-filter was eliminated, which well agreed to our data and model depicting concentration versus column height, showing 1st order gradient.
김대철(Daechul Kim),조의찬(Euichan Cho),전원석(Wonseok Jun),백승현(Seunghyun Back),김용태(Yongtae Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
A new point of view in door belt molding is variable shape, which is a new method based on press or mold and extrusion. This paper aims to make 1-piece belt molding with variable shape which has small angle of corner unless any other problems of glass moving ability for C project car.
Proactive Approach for Biofouling Control
Niamul Haque,Daechul Cho,Jeong Mee Lee,Dong Su Lee,Sunghyun Kwon 대한환경공학회 2014 Environmental Engineering Research Vol.19 No.4
Macro fouling due to blue mussels (Mytilus edulis) has affected negatively on the operation efficiency and eventual system failure of offshore structures and coastal power stations. A certain range of chlorine (0.05, 0.1, 0.3, 0.5, 0.7 and 1.0 mg/L) was applied on the mussel larvae to identify the survival rate with respect to various exposure times under laboratory condition. The ciliary movement of the larvae was used to check their survival. The 1.0 mg/L of chlorine shows to 97% of larvae mortality whereas 0.7 mg/L of chlorine shows only 16% of larvae mortality. Minimum exposure times for 100% larvae mortality ranged from 300 to 20 min for increasing concentrations of chlorine (0.05~1.0 mg/L). It was found that 1 mg/L of chlorine was 4 times more efficient than 0.7 mg/L of that, and 15 times more than 0.05 mg/L of chlorine dose. Data collected and analyzed here will help plant operators to optimize chlorine dosage and its scheduling.
Niamul Haque,Daechul Cho,Sunghyun Kwon 대한환경공학회 2014 Environmental Engineering Research Vol.19 No.4
One chambered sediment microbial fuel cell (SMFC) was equipped with Fe, brass (Cu/Zn), Fe/Zn, Cu, Cu/carbon cloth and graphite felt anode. Graphite felt was used as common cathode. The SMFC was membrane-less and mediator-less as well. Order of anodic performance on the basis of power density was Fe/Zn (6.90 Wm-2) > Fe (6.03 Wm-2) > Cu/carbon cloth (2.13 Wm-2) > Cu (1.13 Wm-2) > brass (Cu/Zn=0.24 Wm-2) > graphite felt (0.10 Wm-2). Fe/Zn composite anode have twisted 6.73% more power than Fe alone, Cu/carbon cloth boosted power production by 65%, and brass (Cu/Zn) produced 65% less power than Cu alone. Graphite felt have shown the lowest electricity generation because of its poor galvanic potential. The estuarine sediment served as supplier of oxidants or electron producing microbial flora, which evoked electrons via a complicated direct microbial electron transfer mechanism or making biofilm, respectively. Oxidation reduction was kept to be stationary over time except at the very initial period (mostly for sediment positioning) at anodes. Based on these findings, cost effective and efficient anodic material can be suggested for better SMFC configurations and stimulate towards practical value and application.