| 超滤的预处理工艺对比研究:化学混凝与电絮凝 |
| 摘要点击 2463 全文点击 951 投稿时间：2016-06-06 修订日期：2016-07-04 |
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| 中文关键词 超滤 化学混凝 电絮凝 膜污染 滤饼层 |
| 英文关键词 ultrafiltration chemical coagulation electrocoagulation membrane fouling cake layer |
| 作者 | 单位 | E-mail | | 赵凯 | 河北工业大学土木与交通学院, 天津 300401
中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085 | 834144572@qq.com | | 杨春风 | 河北工业大学土木与交通学院, 天津 300401 | | | 孙境求 | 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085
中国科学院大学, 北京 100049 | | | 李静 | 河北工业大学土木与交通学院, 天津 300401 | | | 胡承志 | 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085 | czhu@rcees.ac.cn |
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| 中文摘要 |
| 对比研究了化学混凝（chemical coagulation，CC）与电絮凝（electrocoagulation，EC）作为超滤膜分离的预处理工艺，在死端过滤条件下与超滤膜的作用机制以及对膜污染的减缓效果. 主要研究了Al3+投加量对膜通量、絮体性质（粒径、强度系数、恢复系数、分形维数）、以及滤饼层性质的影响. 结果表明，EC作为预处理时，生成的絮体强度大且结构紧实，在膜表面堆积形成的滤饼层具有疏松多孔、亲水性强的性质；而CC作为预处理时，生成的絮体强度低且比较松散，在膜过滤过程中容易被压力压碎压实，导致滤饼层比较密实、亲水性低. 因此，EC作为预处理工艺对膜污染的减缓效果好，在运行过程中可以保持较高的膜通量，膜通量较CC高约5.57%. |
| 英文摘要 |
| The ultrafiltration membrane response mechanism and the effect on the membrane fouling under dead end filtration were comparatively investigated in ultrafiltration pretreatment processes using chemical coagulation (CC) and electrocoagulation (EC). The effects of Al3+ dosage on the flux of the membrane,the properties of the floc (particle size, strength coefficient, recovery coefficient, fractal dimension) and the properties of the cake layer were studied. The results showed that taking EC as a pretreatment method, the flocs were stronger and more compact, the cake layer deposited on the surface was porous and higly hydrophilic; while in CC pretreatment, the flocs were loose and had low strength, which would be compacted and crushed easily by the pressure in membrane filtration process, resulting in relatively dense cake layer and low hydrophilicity. Therefore, EC was the most effective pretreatment process to alleviate membrane fouling during operation, which could maintain a flux that was about 5.57% higher than CC. |
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