AbstractMembrane fouling mechanisms of the filtration of a mixed-culture microalgal biomass grown in real wastewater were investigated using crossflow filtration experiments. The results of flux measurements, scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses for three membranes, two microfiltration (PES01 and PES003) and one ultrafiltration (UC030), showed that the UC030 membrane may be more appropriate for microalgae harvesting due to its higher steady flux rate and lower flux reduction during filtration compared to the initial flux (44% for UC030, compared to 86% for PES01 and 79% for PES003). It was also observed that the membrane resistance due to concentration polarization was the dominant membrane resistance in this study for all three membranes, constituting about 67%, 61% and 51% for PES01, PES003, and UC030, respectively. The next largest membrane resistance was provided by pore blocking, while the resistance provided by cake formation was found to be very small for all membranes (3%, 15% and 18% for PES01, PES003 and UC030, respectively), which were also supported by SEM and AFM analyses.

中文翻译：

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废水中生长的混合微藻生物质的膜过滤污染机制

摘要使用错流过滤实验研究了在真实废水中生长的混合培养微藻生物质过滤的膜污染机制。对三种膜、两种微滤（PES01 和 PES003）和一种超滤（UC030）的通量测量、扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 分析结果表明，UC030 膜可能更适合微藻收获由于与初始通量相比，其稳定通量率更高，过滤过程中通量降低更低（UC030 为 44%，而 PES01 为 86%，PES003 为 79%）。还观察到，浓差极化引起的膜电阻是本研究中所有三种膜的主要膜电阻，分别占 PES01、PES003 和 UC030 的约 67%、61% 和 51%。第二大的膜阻力是由孔堵塞提供的，而结饼形成提供的阻力对于所有膜来说都非常小（PES01、PES003 和 UC030 分别为 3%、15% 和 18%），这也得到了支持通过 SEM 和 AFM 分析。