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Rabindra Bade,이승환 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2
micellar enhanced ultrafiltration (MEUF) and activated carbon fibre (ACF) hybrid proceses. Sodium dodecyl sulphate(SDS) was used as a surfactant. Copper removal increased with the increase of molar ratio of copper to SDS, operatingretentate presure and initial permeate flux. Permeate flux decreased with the increase of molar ratio of copper to SDS.Specific and relative fluxes declined, respectively, with the increase of retentate pressure and initial permeate flux.Based on removal efficiency and permeate flux, initial permeate flux of 1.05 m3/m2/day, copper to SDS molar ratiometers for 0.5 mM or les initial copper concentration. Average copper removal at the optimised condition was 98%and the corresponding permeate copper concentration was less than 1 mg/L. Adsorptive capacity of activated carbonfibre (ACF) for SDS was 170 mg/g. Langmuir isotherm equation gives a better fit with the experimental results com-pared to the Freundlich isotherm equation. Overall SDS removal efficiency of two sets of ACF unit in series was 85% .
Rabindra Bade,Seung Hwan Lee 대한환경공학회 2008 Environmental Engineering Research Vol.13 No.2
In this study, chromate and cetylperidinium chloride (CPC) removal from artificial wastewater was monitored by using micellar enhanced ultrafiltration (MEUF) and activated carbon fibre (ACF) adsorption hybrid processes. For the efficient chromate removal, molar concentration of the CPC should be five times that of chromate and it should be at least one critical micelle concentration (CMC). The MEUF was found to be effective in the chromate removal while ACF in the CPC adsorption to produce chromate and CPC free effluents. The chromate and CPC removal was 99.8% from MEUF-ACF process. Effluent chromate concentration was exponentially correlated with molar ratio of CPC to chromate and pH.
Optimization of Micellar Enhanced Ultrafiltration (MEUF) Process for Copper Removal
Rabindra Bade,Seung Hwan Lee,Ki Tae Baek,Gook Man Ahn,Jong Dal Kim 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12
Several series of experiments were conducted to find copper removal from artificial suspension by using micellar enhanced ultrafiltration (MEUF) with sodium Dodecyl Sulphate (SDS) as a surfactant. To optimize the system operating parameters molar ratio, initial concentration of copper, retentate pressure, pH, flow rate were monitored. The investigated results showed that copper removal increased with the increase in molar ratio; however flux decreased due to the formation of flocs. The removal was about 98%, when copper to SDS molar ratio was 1:30. With the increase in operating retentate pressure, flow rate, and initial concentration of copper; copper removal decreased in addition to decrease in flux. From the economical and removal point of view neutral water gave the better results. In terms of removal efficiency and permeate flux, flow rate of 40 ml/min, copper to SDS molar ratio of 1:30, and operating retentate pressure of 1.4 bars were found to be the optimum operating parameters within the experimental condition operated.
박혜옥,오상화,Rabindra Bade,신원식 대한토목학회 2011 KSCE Journal of Civil Engineering Vol.15 No.3
A combined process consisting of Moving-Bed Biofilm Reactors (MBBRs) with Polyurethane-Dyeing Sludge Carbonaceous Material (PU-DSCM) foam and chemical coagulation was investigated for dyeing wastewater treatment. The pilot-scale MBBR system was composed of two aerobic MBBRs in series. Each reactor was filled with 20% (v/v) of Polyurethane-Dye Sludge Carbonaceous Material foam (PU-DSCM foam) inoculated with a white-rot fungus, Phanerochaete chrysosporium, for biological treatment followed by chemical coagulation with FeCl2 or alum. In the MBBR process, 79% of COD and 54% of color (influent COD = 539 mg/L and color = 622 PtCo units) were removed at MLSS concentration of 2900 mg/L attached to the PU-DSCM carrier and 48 hr of short Hydraulic Retention Time (HRT) at steady state. The biologically treated dyeing wastewater was subjected to chemical coagulation. After coagulation with alum at the optimum dosage (1.55 mg alum/mg COD), 95.7% of COD and 73.4% of color were removed in overall. The combined process of fungal MBBRs and chemical coagulation has promising potential for dyeing wastewater treatment.
Application of Activated Carbon Fiber (ACF) for Arsenic Removal from Aqueous Solution
이승환(Seung Hwan Lee),Juhaina Junaid,Rabindra Bade 대한환경공학회 2006 대한환경공학회 학술발표논문집 Vol.2006 No.12
In this study, the adsorption of arsenic from aqueous solution by using Activated carbon fibre was investigated. Experiments were conducted to find the effect of operating parameters equilibrium time, flow rate, and initial concentration that affect the adsorption rate. .From the experimental result it was found that average removal efficiency for arsenic was 24% for initial concentration of 10-17 mg/lit. The ACF system showed that for aqueous solution containing arsenic, breakthrough was reached at 5 hours of the experimental run. The result demonstrated that the adsorption capacity of the filter was 0.18 mg/mg of ACF. With the increase of flow rate there was slightly increase in removal of arsenic. Field test result of thirty contaminated site in Sonarang, Bangladesh showed arsenic removal was only 13% in single ACF system while it increased to 24.6% in the ACF system having two ACF in series. Therefore, ACF system with two ACF in series gives better result. Among number of models tested, three dimensional non-linear models gave over 90% fit while for other linear models it was at the range of 5-92% depending upon operating parameter varied. Thus, non linear models best described the relationship of C with C0 and t.