Membranes have a lot of potential for harvesting microalgae, but mainly membrane fouling and high harvesting costs linked to low fluxes are hampering their breakthrough. Patterned membranes can reduce fouling by enchancing local turbulences close to the membrane surface on one hand, and by increasing the active area per m² of installed membrane on the other. Flocculation can further increase membrane permeance by increasing microalgal partical size and reducing the fraction of free organic matter in the feed. In current study, the effect of polyethylene glycol (PEG) in the casting solution of patterned polysulfone membranes was investigated to better tune the performance of the patterned membranes, together with the effects of cross-flow velocity and chitosan dosage on membrane fouling. The energy consumption and total harvesting cost, extrapolated to a full-scale microalgal harvesting, were then estimated. The patterned membrane prepared with a 28w% PEG concentration showed the highest clean water permeance (900±22 L/m² h bar) and membrane permeance in a microalgal suspension (590±17 L/m² h bar). Patterned membranes showed a lower filtration resistance (15% permeance decline at the end of filtration) than flat membranes (72%) at a cross-flow velocity of 0.0025 m/s. Increasing cross-flow velocity could increase membrane permeance in most cases. The highest stable membrane permeance (110±17 L/m² h bar) and the lowest filtration resistance were achieved when combining patterned membrane filtration with flocculation at optimized chitosan dosage. A very low energy consumption (0.28 kWh/kg) and harvesting cost (0.16 €/kg) were achieved under these conditions.

膜具有收获微藻的巨大潜力，但主要是膜污染和与低通量有关的高收获成本阻碍了它们的突破。一方面，通过使靠近膜表面的局部湍流着迷，并通过增加每m ²的有效面积，图案化的膜可以减少结垢。安装在另一侧的膜。絮凝可通过增加微藻颗粒的大小并减少进料中游离有机物的比例来进一步提高膜的渗透性。在当前的研究中，研究了聚乙二醇（PEG）在有图案的聚砜膜流延溶液中的作用，以更好地调节有图案的膜的性能，以及错流速度和壳聚糖用量对膜结垢的影响。然后估算了能量消耗和总收获成本，这些能量和总收获成本被推断为全面的微藻类收获。用28w％PEG浓度制备的图案化膜在微藻悬浮液中显示出最高的净水渗透率（900±22 L / m ² h bar）和膜渗透率（590±17 L / m ^2）h bar）。在0.0025 m / s的错流速度下，带图案的膜显示出比平膜（72％）低的过滤阻力（过滤结束时渗透率下降15％）。在大多数情况下，增加错流速度可以增加膜的渗透性。当在优化的壳聚糖剂量下将图案化的膜过滤与絮凝相结合时，可获得最高的稳定膜渗透率（110±17 L / m ² h bar）和最低的过滤阻力。在这些条件下，实现了非常低的能耗（0.28 kWh / kg）和收获成本（0.16€/ kg）。