| Abstract |
| Biological granular activated carbon (BAC) bed has been applied to remove a micropollutant in the surface water being used as water supply source. Membrane filtration (MF) has also been introduced water treatment plant to provide better quality drinking water by removing bacteria, viruses, microorganisms as well as particulate and organic matter. This study aims to investigate the effect of BAC biofiltration as a pretreatment before MF processes and evaluate the performance of BAC/MF systems for the treatment of lake water. Applied filtration rates during this experiment were <100 m/d for BAC and 0.5 ㎥/㎡.d for MF. Influent concentration were on humic acid <10 mg/L, turbidity <100 NTU, UV254 < 0.250 cm-1, dissolved organic carbon (DOC) < 9.7 mg/L, d respectively. As a result, both BAC bed and BAC/MF system achieved more than 90% efficiency in removing turbid and organic matters corresponding to UV254 and DOC. This indicates that the biofiltration of BAC bed was considerably effective for reducing foulants. The transmembrane pressure (TMP) at increased MF rates was in proportion to the increased humic acid rates in the range of 2 to 10 mg/.L These results indicate that the addition of a BAC bed prior to the membrane filtration process is necessary for cost-effective lake water treatment due to both efficient reductions of geosmin and 2-MIB as well as micropollutants and membrane fouling mitigation due to reduction of the TMP. Silt density index(SDI) were found to be one of the most effective and convenient variables of sludge to evaluate sludge properties and membrane fouling, and an empirical relationship between SDI and membrane permeability was proposed for effectively predicting membrane fouling in an MF and combined MF with conventional treatment processes at high and different turbidity and DOC concentrations. |
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| Key Words |
| BAC bed, Biofiltration, Geosmin, 2-MIB, MF process, Micropollutants, Pretreatment, TMP, 생물입상활성탄공정, 생물여과, 분리막여과공정, 이취미물질, 미량오염물질, 전처리, 막간차압 |
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