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.
基于XDLVO理论的亲疏水组分对超滤膜污染的影响
- Title:
- Effect of Hydrophobic/Hydrophilic Components on Ultrafiltration Membrane Fouling Based on XDLVO Theory
- Keywords:
- ultrafiltration; membrane fouling; hydrophobic and hydrophilic components; XDLVO theory; interface energy barrier
- 摘要:
- 天然有机物的亲疏水性对膜污染的影响较大，但目前对其缺乏深入理解。以东江水为超滤原水，从界面作用角度探究不同亲疏水组分对超滤膜污染的影响。结果显示：原水中强疏水性和弱疏水性组分主要为腐殖类和蛋白类物质，而亲水组分主要为多糖类物质；相比疏水性组分，亲水性组分对超滤膜的污染较为严重。进一步采用腐殖酸（HA）、牛血清白蛋白（BSA）、海藻酸钠（SA）作为亲疏水组分的代表，研究各类污染物在不同pH条件下的污染行为。对于SA和HA，随着pH的增加膜通量衰减趋缓，对于BSA来说，在pH远离零电荷点（pH=4.7）时膜通量衰减较为缓和；整体来看，三者对膜污染的严重程度排序为SA>HA>BSA。采用XDLVO理论从界面作用能角度来理解膜污染，结果发现：不同pH条件下三类污染物对膜污染的影响与界面能垒呈现正相关性，能垒越大，膜表面对污染物的抵抗作用越强，越有利于缓解膜污染；此外，膜过滤后期的相对平稳通量值与“污染物-污染膜”界面能垒呈线性正相关。研究结果对原水预处理及水化学调配控制污染具有重要的启发。
- 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.
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