混凝预处理及膜面流速控制对微滤膜污染的影响研究  

Research on Influence of Pre-coagulation and Cross-flow Velocity on Membrane Fouling of Microfiltration

作　　者：李鹏飞[1] 谢朝新[1,2] 周宁玉[1,2] 陈璐斌 刘帅[1] 

机构地区：[1]后勤工程学院国防建筑规划与环境工程系,重庆401311 [2]重庆市水工业与环境工程技术研究中心,重庆401311

出　　处：《环境科技》2015年第1期1-5,共5页Environmental Science and Technology

摘　　要：为研究膜面流速和混凝预处理对微滤过程膜污染的综合影响,用旋流式膜混凝反应器进行了不同流量、入口管径、混凝剂投加量下的除浊试验。结果表明,直接微滤时,高膜面流速加剧了初期膜的孔堵污染,但抑制了滤饼层的累积,适于长期运行;在质量浓度为0-18 mg/L范围内增大聚合氯化铝（PAC）投加量可显著抑制膜过滤阻力的增长;以速度梯度（G）表征絮体状态,由于絮体尺寸和错流的综合作用,投加混凝剂后,G在20-70 s^-1范围内,414.64 s^-1时微滤膜污染较轻。A MCR combined with swirling flow was used in a turbidity removal experiment which was conducted at different conditions of flow rate, inlet pipe diameter and coagulant dose in order to investigate the integrative influence of cross-flow velocity and pre-coagulation on membrane fouling during microfiltration. The results showed that high cross-flow velocity lead to severe pore fouling of membrane in the initial stage, but then it restrains the accumulation of cake, so it＇s better to use that in long-term operation. Increasing aluminium polychlorid dose at a range of 0 to 18 mg/L obviously limits the growth of membrane filtration resistance. Velocity gradient（G） is used to symbolize the condition of flocs. With coagulant added, with G ranging from 20 to 70 s^-1or is 414.64 s^-1, the speed of membrane fouling is much slower,and this is caused by the integrative effect of the increasing floc size and the cross-flow.

关 键 词：膜面流速 混凝 微滤 膜过滤阻力 

分 类 号：X7[环境科学与工程—环境工程]