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정용준,木曾祥秋,박순길,김종용,민경석 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3
The rejection properties of 6 aromatic pesticides were evaluated by a continuous flow system equipped with a hollow fiber NF membrane. Different from the separation experiment of batch cell, the rejection and the removal could be calculated exactly because the concentration of feed, permeate and retentate was separately obtained. The lowest and the highest rejection were found in carbaryl(54.8%) and methoxychlor(99.2%), respectively, and the removals were always shown higher than rejections. This may be caused by some reasons such as the solute adsorption on the membrane, the variation of feed concentration. Although molecular weight, molecular width regarded as solute characteristics and log P(n-octanol/water partition coefficient) as hydrophobicity could be applied to explain the rejection property, these factors should be considered together for better analysis. According to the higher relationship between log B(solute permeability) and molecular weight, it was revealed that the solute separation with this membrane was influenced more by molecular weight.
정용준,木曾祥秋,민경석 한국물환경학회 2004 한국물환경학회지 Vol.20 No.4
Because of being produced a great deal of excess sludges from biological wastewater treatment process, the subject regarding treatment and disposal of them has been significantly handled in real plants. It should be considered the alternative treatment with easy operating and cost effective process in rural areas. For the thickening of wasted activated sludge from small scale wastewater treatment facilities, thus, the provisional sludge thickening system was developed by the application of mesh filter module. Three meshes with different pore size(100, 150, 200μm) were prepared for filter modules that were used to withdraw effluent from thickening system. A filter module with 100μm mesh was chosen as the most effective thickening material in the viewpoint of volume reduction and effluent quality: the volume reductions of initially injected sludge with 3,600 ㎎/L and 9,100 ㎎/L were 95% and 85%, respectively, and the filtered effluents were enough good to be shown below 1.0 ㎎/L of SS and 1.0 NTU of turbidity. Since the filtration of thickening was influenced by the cake layer formed on mesh filter module and this system was operated in the combination of sludge thickening with gravity settling, the filter modules with smaller pore size and the larger floc size were required for long term operation safely.
정용준 ( Jeong Yong Jun ),목증상추 ( Mog Jeung Sang Chu ),민경석 ( Min Gyeong Seog ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.6
5 kinds of pesticides removal with 4 flat sheet NF membranes was examined in a stirred type batch cell experiment and rejection properties were reviewed in the point of solute characteristics. Rejection of Aldicarb, Diazinon, MEP, NAC and Malathion, which are mainly included in the drinking water quality standard, with NTR-729HF having nominal NaCl rejection of 92% was revealed over 91.5%. Molecular weight and width regarded as solute characteristics were applied to explain the rejection property and showed the relevant trend in NTR-729HF and NTR-7250 having relatively higher nominal NaCl rejection. log P as hydrophobicity also played a role on the factor of pesticide rejection. Concerning to pesticide rejection with NF membranes, these three factors should be reviewed together, not independently. In considering the efficiency of pesticides rejection efficiency with different NF membrane, the appropriate NF membrane should be selected for real system.