SHIHui-ting,DENGLiang,YELin-xiong,et al.Influence Factors of Immersed Ultrafiltration Membrane Backwash for Algae-laden Water Treatment[J].China Water & Wastewater,2023,39(7):50-56.
浸没式超滤膜处理高藻水的反冲洗影响因素研究
- Title:
- Influence Factors of Immersed Ultrafiltration Membrane Backwash for Algae-laden Water Treatment
- 摘要:
- 污染是制约浸没式超滤膜高效处理高藻水的关键，合理优化超滤反冲洗策略有助于改善系统整体运行性能。为此，采用截留分子质量为150~300 ku的超滤膜过滤高藻水，探究不同反冲洗方式及排空周期等条件下跨膜压差的变化情况。结果表明，单独气洗在控制跨膜压差增长方面比单独水洗表现得更好；气洗强度越大，跨膜压差的增长速度越慢，当气洗强度为60 m3/（m2·h）时对跨膜压差的控制效果最佳。增加反冲洗强度可能会加剧藻细胞的破裂，造成膜池中蛋白质类物质和溶解性微生物代谢产物的增加。增加膜池排空周期可减缓跨膜压差的增长，当排空周期为12 h时对跨膜压差的控制效果最优。低强度的气水联合冲洗一定程度上能够有效缓解膜污染，这可能与膜表面黏附的污垢减少以及膜池中颗粒物的尺寸增大有关。
- Abstract:
- Membrane fouling is the bottleneck that restricts immersed ultrafiltration membrane for efficient treatment of algae?laden water. Optimization of ultrafiltration backwash strategy is helpful to improve the overall operational performance of the system. Therefore, this paper used the ultrafiltration membrane with the interception molecular weight of 150-300 ku to treat algae-laden water, and investigated the change of transmembrane pressure under different backwash strategies and emptying cycle. Air backwash alone performed better than hydraulic backwash alone in controlling the increase of transmembrane pressure. Higher air backwash intensity resulted in slower increasing rate of the transmembrane pressure. When the air backwash intensity was 60 m3/(m2·h), the best transmembrane pressure control performance was achieved. Increasing the backwash intensity might aggravate the breakage of algal cells, resulting in increased concentrations of protein-like substances and soluble microbial products in the membrane tank. The increase of the membrane tank emptying cycle slowed down the increase of the transmembrane pressure, and the optimal control performance was achieved when the emptying cycle was 12 hours. The low-intensity combined air and water backwash effectively alleviated membrane fouling to some extent, which might be related to the reduction of fouling scale on the membrane surface and the increase of particulate size in the membrane tank.
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