Abstract: Base on the characteristics of microalgae culture, different methods for pretreatment and dewatering in microalgae recovery technology have been reviewed, including pre-oxidation, chemical flocculation, physical pretreatment, sedimentation, filtration, centrifugation, foam flotation and air flotation. The results show that the cells release extra organic matters after pre-oxidation which is beneficial to flocculation sedimentation, but excess dosage of oxidant can damage the cells and even make extinction. The efficiency of successor dewatering can be greatly improved after chemical flocculation and physical pretreatment. Due to low concentration of culture and fine particles of microalgae, the problems of low efficiency and high cost may occur while using traditional methods of sedimentation, filtration, centrifugation and so on. However, air flotation is suitable for dewatering of low-concentration suspension system, and it is quite a feasible technology for microalgae recovery.

Key words: microalgae, recovery, pretreatment, dewatering

摘要： 从微藻培养液的特性出发，总结了目前微藻采收工艺中预处理和富集分离阶段的各种方法，包括预氧化、化学絮凝、物理预处理、沉降、过滤、离心、泡载和气浮等. 已有研究结果表明，经预氧化处理后，细胞分泌胞外产物，有利于絮凝沉降，但药剂过量会引起细胞损伤甚至消亡；化学絮凝和物理处理可以大大提高后续富集分离的效率. 由于微藻培养液浓度低、粒度小，传统的沉降、过滤、离心等方法用于微藻的采收都存在效率低、成本高的限制，而气浮法适用于低浓度悬浮体系的富集分离，是微藻采收可行的技术途径之一.

关键词: 微藻, 采收, 预处理, 分离