In this study, a simple way of generating turbulence via the use of an orifice was developed for the purpose to mitigating membrane fouling in microalgae harvesting. When an orifice with given number of holes was installed at the inlet of a membrane module, vigorous turbulence was observed on the surface of the membrane, which caused to detach the cake layer and limit further formation of it. Experiments on Chlorella sp. HS-2 showed that the filtration efficiency increased up to 299% compared to the conventional cross-flow operation. Through computational fluid dynamics, it was proven that the orifice increased the shear stress over the membrane surface area from 0.7 Pa to maximum average shear stress of 52.3 Pa. With regards to the operation time, microalgae harvesting could be finished nearly 3 times faster with the orifice. Faster harvesting time implies more quantity at a given time, not to mention prevention of quality degradation associated with cell decay. Low power consumption with enhanced filtration performance supported that membrane filtration equipped with an orifice can offer a promising means for microalgae harvesting, in terms of surpassing effectiveness and simplicity.

在这项研究中，开发了一种通过使用孔口产生湍流的简单方法，目的是减轻微藻收获中的膜污染。当在膜组件的入口处安装具有给定数量的孔的孔时，在膜表面上会观察到剧烈的湍流，这会导致滤饼层脱离并限制其进一步形成。小球藻的实验。HS-2显示，与常规错流操作相比，过滤效率提高了299％。通过计算流体动力学证明，孔板将膜表面积上的切应力从0.7 Pa增加到最大平均切应力52.3 Pa。就操作时间而言，微藻的收获速度可以提高近3倍。孔。更快的收获时间意味着在给定的时间会有更多的数量，更不用说防止与细胞衰变相关的质量下降了。低功耗和增强的过滤性能支持具有孔口的膜过滤可以提供超有前途的微藻收获方法，其有效性和简便性均超乎想象。