Dewatering algal suspensions is an important step in the extraction of oil and other useful substances from algae. In this study, spherical Nannochloropsis sp. and ellipsoidal Monoraphidium sp. suspensions were dewatered in the presence of different amounts of 350‐nm magnetite particles using a microfiltration membrane with 360‐nm pores in cross‐flow mode. Magnetite functions as a filter aid by reducing the deformation of the cake of filtered algae on the membrane and providing paths for water to flow through the filtration cake of algae. In the case of Nannochloropsis sp., the highest dewatering rate was obtained when the number ratio, defined based on the size and ideal density, between Nannochloropsis sp. and magnetite was 1:12.5, but the addition of magnetite had no observable effect on the filtration of ellipsoidal Monoraphidium sp. suspensions through the membrane. After dewatering, magnetite was effectively separated from the concentrated algal suspension by the application of a magnetic field in an open flow system. Magnetite has the potential to enhance dewatering performance using a cross‐flow membrane system.

中文翻译：

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在磁铁矿作为助滤剂的情况下，使用交叉流微滤对藻类悬浮液进行脱水。

脱水藻类悬浮液是从藻类中提取油和其他有用物质的重要步骤。在这项研究中，球形Nannochloropsis sp。和椭圆形的Monoraphidium sp。在不同数量的 350 nm 磁铁矿颗粒存在下，使用具有 360 nm 孔的微滤膜以错流模式对悬浮液进行脱水。磁铁矿通过减少滤过的藻类滤饼在膜上的变形并为水流过藻类滤饼提供路径而起到助滤剂的作用。在的情况下，微拟球藻属，被当数比，定义基于尺寸和理想的密度获得了最高的脱水率，间微拟球藻sp. 和磁铁矿的比例为 1:12.5，但磁铁矿的加入对椭圆形Monoraphidium sp.的过滤没有明显影响。悬浮液通过膜。脱水后，通过在开放式流动系统中施加磁场，磁铁矿与浓缩的藻类悬浮液有效分离。磁铁矿具有使用错流膜系统提高脱水性能的潜力。