JUXin-yu,LIZhi-hao,ZHUMing-fei,et al.Impact of Algae-derived Foulants on Separation Efficiency of Forward Osmosis Membrane[J].China Water & Wastewater,2025,41(7):39-46.
藻源污染物对正渗透膜分离性能的影响
- Title:
- Impact of Algae-derived Foulants on Separation Efficiency of Forward Osmosis Membrane
- 摘要:
- 正渗透（FO）在处理含藻水体时存在的主要问题是膜污染，水通量可能会受到累积在膜表面的活/死藻细胞以及藻源有机物的影响。为此，探究了铜绿微囊藻藻源污染物对FO膜分离的影响，并明确分离过程中的主要污染物。结果表明，铜绿微囊藻的4种藻源污染物即活藻细胞、死藻细胞、藻细胞外有机物（EOM）、藻细胞内有机物（IOM）引起的水通量损失分别为27.43%、9.57%、13.14%、17.53%，其中，活藻细胞造成的膜污染最严重，IOM次之。活藻细胞的界面能垒值（0.26×10-18 J）比死藻细胞（1.63×10-18 J）小，表明活藻细胞与正渗透膜之间的排斥作用较小，进而导致其造成的膜污染更严重。XDLVO理论的计算结果表明，活藻细胞+EOM的组合界面自由能更负，容易相互聚合并黏附在FO膜上，其造成的水通量损失在混合污染中最大。
- Abstract:
- The primary challenge in utilizing forward osmosis (FO) for the treatment of algae-laden water is membrane fouling, which can be caused by the accumulation of both live and dead algal cells on the membrane surface, as well as the presence of algal-derived organic matter. This fouling may significantly impact the water flux. In this study, the impact of Microcystis aeruginosa-derived algal foulants on FO membrane separation was systematically investigated, and the primary foulants present during the separation process were identified. The flux loss caused by four types of Microcystis aeruginosa-derived foulants, live algal cells, dead algal cells, algal extracellular organic matter (EOM) and algal intracellular organic matter (IOM), were 27.43%, 9.57%, 13.14%, and 17.53%, respectively. Among these, the membrane fouling caused by live algal cells was the most severe, followed by that induced by IOM. The interfacial energy barrier for live algal cells (0.26×10-18 J) was significantly lower than that for dead algal cells (1.63×10-18 J). This suggested that the repulsive force between live algal cells and the FO membrane was weaker, resulting in more severe membrane fouling caused by live algal cells. The calculation results based on the XDLVO theory indicated that the interfacial free energy of living algal cells in combination with EOM was significantly more negative, leading to a higher propensity for aggregation and adhesion to the FO membrane. Consequently, this phenomenon contributed to the most substantial water flux loss among mixed foulants.
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