| 混凝预处理对超滤膜通量的影响 |
| 摘要点击 2066 全文点击 990 投稿时间：2007-09-25 修订日期：2008-01-08 |
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| 中文关键词 饮用水处理 超滤膜过滤 混凝预处理 通量 |
| 英文关键词 drinking water treatment ultrafiltration membrane filtration coagulation pretreatment flux |
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| 中文摘要 |
| 为探讨混凝预处理对改善超滤膜过滤通量的效果.试验采用了4种具有不同亲疏水性的水样，着重探讨混凝对有机物的疏水性和亲水性组分的去除效果以及所带来的通量改善.试验结果表明，超滤膜直接过滤原水时，4种水样的有机物截留率在12%～20%，但其中的疏水性组分均超过了50%，说明膜倾向于截留疏水性有机物.投加25 mg/Ｌ的混凝剂，4种水样的有机物去除率在12%～28%，投加量增加至100 mg/Ｌ，去除率也相应增加至25%～38%，但其中的疏水性组分均占50%以上.混凝预处理均可有效提高通量.对有机物各组分的分析表明，膜处理混凝预处理水时，主要截留亲水性组分，这是由于混凝可有效去除疏水性组分的缘故.由此也可得出结论，超滤膜的通量下降主要是由疏水性有机物引起的，亲水性组分对通量的影响较小. |
| 英文摘要 |
| In this study, the effect of coagulation pretreatment on improvement of UF membrane filtration flux was investigated. The experiment using four water samples having different hydrophobic and hydrophilic compound was focused on the effect of coagulation on removing hydrophobic and hydrophilic fraction of organics and resulting enhanced flux. In the filtration of raw water, the organics removal for the four water samples were in the ranges of 12% and 20%, in which hydrophobic fraction accounting for over 50%, suggesting that membrane prefers to remove hydrophobic fraction. In the addition of 25 mg/Ｌ coagulant, the organics removals for the four water samples were in the ranges of 12% and 28%. As coagulant dosage increased to 100 mg/Ｌ, removals increased to 25% and 38% accordingly, in which hydrophobic fraction accounting for over 50%, suggesting that coagulation prefers to remove hydrophobic fraction. Coagulation pretreatment could enhance flux of all of water samples studied. The analyses for each organic compound show that after coagulation pretreatment membrane reject hydrophilic fraction mainly due to removal of hydrophobic fraction effectively by coagulation. It can be concluded that the flux decline of UF membrane was mainly caused by hydrophobic compound and hydrophilic compound had less effect on flux. |
