Challenges and influencing factors in microalgae harvesting using crossflow membrane technology

As a result of the renewable nature of microalgae, combined with significant potential for application in various industries (such as bioenergy and nutrition), there is increasing interest in their commercial production. A key processing step is harvesting the microalgae and utilization of crossflow membrane technology is gaining interest. Published research shows biomass recoveries of 93%–100%, relatively low energy consumption, and the option to avoid chemical additives. This review discusses membrane harvesting performance, by examining the effect of microalgal physical characteristics, membrane and module types, and operational conditions. As membrane fouling is a major challenge to maintaining good performance, different strategies to control and mitigate fouling are also discussed.