Membrane fouling performance of Fe-based coagulation-ultrafiltration process: Effect of sedimentation time
文献类型：期刊论文
| 作者 | Ding, Yanyan; Li, Tong; Qiu, Kaipei; Ma, Baiwen; Wu, Ruijun |
| 刊名 | ENVIRONMENTAL RESEARCH
 |
| 出版日期 | 2021-04 |
| 卷号 | 195页码:- |
| ISSN号 | 0013-9351 |
| 关键词 | Ultrafiltration Coagulation Floc Sedimentation time Fouling behavior |
| 英文摘要 | Pre-coagulation is commonly used with ultrafiltration (UF) to alleviate the membrane fouling. Compared to conventional coagulation-sedimentation-UF (CSUF) processes, the direct coagulation-UF (CUF) processes are widely believed to perform better due to the formation of a looser cake layer. It is however shown in this study that not only the density of a cake layer, but also its thickness as well, can affect the membrane fouling behavior, which therefore are influenced by both the sedimentation time and flocs characteristics. Herein, the membrane fouling performance of Fe-based coagulation-UF process was systematically investigated with different sedimentation times. A critical threshold of 30 min was observed at the lab-scale: if shorter than that, the membrane fouling depended mainly on the cake layer density, and thus CUF outperformed CSUF; but when the sedimentation time was over 30 min, the cake layer thickness turned to be the dominant factor, thereby resulting in CSUF performing better. Furthermore, it was shown that the critical sedimentation time was decided by flocs characteristics. A lower water temperature induced the formation of irregular flocs with a lower fractal dimension, and the corresponding cake layer exhibited an almost identical density with increasing sedimentation time. In this regard, CSUF processes were constantly superior to CUF as the cake layer thickness decreased. On the other hand, a critical sedimentation time reappeared because of the higher floc fractal dimension under acidic conditions. This work showed for the first time that the membrane fouling of CSUF was up to the sedimentation time, and it was possible to outperform CUF if the sedimentation time exceeded a critical threshold. Such a finding is crucial to the future development of coagulation integrated UF processes. |
| WOS研究方向 | Environmental Sciences ; Public, Environmental & Occupational Health |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46233]  |
| 专题 | 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 |
| 作者单位 | 1.East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R 2.Tongji Univ, Sch Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Guangzhou Univ, Inst Environm Res Greater Bay Area, Minist Educ, Guangzhou 510006, Peoples R China 6.Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou 510006, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ding, Yanyan,Li, Tong,Qiu, Kaipei,et al. Membrane fouling performance of Fe-based coagulation-ultrafiltration process: Effect of sedimentation time[J]. ENVIRONMENTAL RESEARCH,2021,195:-. |
| APA | Ding, Yanyan,Li, Tong,Qiu, Kaipei,Ma, Baiwen,&Wu, Ruijun.(2021).Membrane fouling performance of Fe-based coagulation-ultrafiltration process: Effect of sedimentation time.ENVIRONMENTAL RESEARCH,195,-. |
| MLA | Ding, Yanyan,et al."Membrane fouling performance of Fe-based coagulation-ultrafiltration process: Effect of sedimentation time".ENVIRONMENTAL RESEARCH 195(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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