| Abstract |
| A lake water having a good quality has been used for a drinking water source. However, the lake water quality depends on a seasonal change. The objective of this study was carried out to investigate the effects of rapid sand filteration (RSF) coupled with membrane filtration (MF) processes for an advanced treatment of lake water with the level of organics and turbid matters. Applied filtration rates during this experiment were < 120 m/d for RSF and 0.5 ㎥/㎡.d for MF. Influent concentration were on average turbidity < 100 ntu, dissolved organic carbon (DOC) < 9.5 mg/L, dissolved total nitrogen (DTN) < 0.560 mg/L, dissolved total phosphorus (DTP) < 0.016 mg/L, and ultraviolet absorbance at 254 nm (UV254) < 0.240 cm-1,respectively. As a result, both SF process and RSF/MF system achieved 90% efficiencies in removing turbid matter. The removal efficiency of UV254 and DOC were 30-40% for SF process and 69-78% for RSF/MF sytem. This indicates that the SF/MF system achieved 2 times higher than that of SF process in removing UV254 and DOC. For transmembrane pressure (TMP), TMP increasing rate of MF was in proportion to an increasing rate of humic acid from 2 mg/L to 10 mg/.L These results indicate that the introduction of SF process prior to membrane filtration process is necessary for an cost-effective lake water treatment due to both efficient reduction of organic and turbid matters and membrane fouling mitigation due to the efficient reduction of TMP. |
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| Key Words |
| Humic substance, Lake water treatment, Membrane filtration process, Pretreatment, Sand filtration, TMP, Turbid matter, 호소수처리, 분리막여과, 전처리, 모래여과, 휴믹물질, 탁질 |
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