关键词: 能源微藻, 絮凝, 离心, 过滤, 气浮

Abstract: Microalgae is considered the most viable alternative to replace the use of fossil energy due to microalgae’s advantages of short growth cycle，high lipid content，renewability，and low pollution. However，the high cost in microalgae processing，especially in its collection，hinders its commercialization. In this paper，the domestic and international collection methods of microalgae are reviewed. The mechanisms and recovery efficiencies of flocculation，centrifugation，filtration and flotation are highlighted. Flocculation method is widely used，centrifugation method is efficient，filtration method is economical for microalgae large in volume，and flotation method is simple in process and less energy consuming. Meanwhile，some novel harvesting technologies of energy microalgae are presented，such as magnetic separation，osmosis，vacuum gas lift and microbe co-culture. Among these methods，magnetic separation has a high recovery rate，osmosis causes low pollution，vacuum gas lift is low-energy-consuming，and microbe co-culture can be combined with traditional methods so that the amount of flocculating agents can be decreased. Finally，the problems and development directions of microalgae collection are proposed. Collection cost can be decreased through combining a couple of methods.

Key words: energy microalgae, flocculation, centrifugation, filtration, flotation