YUJian-xin,ZHONGQi-yun,LONGZhi-hong,et al.Effect of Hydrophobic/Hydrophilic Components on Ultrafiltration Membrane Fouling Based on XDLVO Theory[J].China Water & Wastewater,2023,39(7):35-42.
Effect of Hydrophobic/Hydrophilic Components on Ultrafiltration Membrane Fouling Based on XDLVO Theory
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第7期
Page:
35-42
Column:
Date of publication:
2023-04-01
- Keywords:
- ultrafiltration; membrane fouling; hydrophobic and hydrophilic components; XDLVO theory; interface energy barrier
- Abstract:
- The hydrophilicity/hydrophobicity of natural organic compounds has a great influence on membrane fouling, but still lack in-depth understand. Dongjiang water was used as ultrafiltration raw water to investigate the influence of different hydrophobic and hydrophilic components on ultrafiltration membrane fouling from the perspective of interface interaction. The results showed that the strong hydrophobic and weak hydrophobic components were mainly humic and protein, while the hydrophilic components were polysaccharide. Compared to hydrophobic components, hydrophilic components caused severer fouling. Humic acid (HA), bovine serum albumin (BSA) and sodium alginate (SA) were further used as the typical hydrophobic/hydrophilic simulated substances to study the fouling behavior under different pH. For SA and HA, the flux attenuation slowed down with the increase of pH. For BSA, the flux decline was relatively mild at the pH far from the isoelectric point (pH=4.7). On the whole, the order of causing severe fouling was SA>HA>BSA. The XDLVO theory was used to understand membrane fouling from the perspective of the interface interaction energy. The results showed that: under different pH conditions, the influence of three types of pollutants on membrane fouling was highly related to the interface energy barrier. The larger the energy barrier, the stronger the resistance of membrane surface to pollutants, and milder fouling; In addition, the relatively stable flux at the later stage of membrane filtration was linearly and positively correlated with the foulant-fouled membrane interface energy barrier. The research results provide important implications for raw water pretreatment direction for fouling control.
Last Update:
2023-04-01