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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.
정용준 ( Yong Jun Jung ),목증상추 ( Yoshiaki Kiso ),민경석 ( Kyung Sok Min ) 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.