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.
Influence Factors of Immersed Ultrafiltration Membrane Backwash for Algae-laden Water Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第7期
Page:
50-56
Column:
Date of publication:
2023-04-01
- 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.
Last Update:
2023-04-01