Flocculation Harvesting Techniques for Microalgae: A Review
- Authors
- Matter, Ibrahim A.; Vu Khac Hoang Bui; Jung, Mikyoung; Seo, Jung Yoon; Kim, Young-Eun; Lee, Young-Chul; Oh, You-Kwan
- Issue Date
- 1-Aug-2019
- Publisher
- MDPI
- Keywords
- microalgae; harvesting; flocculation; biomass; biorefinery; biofuel
- Citation
- APPLIED SCIENCES-BASEL, v.9, no.15
- Journal Title
- APPLIED SCIENCES-BASEL
- Volume
- 9
- Number
- 15
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1113
- DOI
- 10.3390/app9153069
- ISSN
- 2076-3417
- Abstract
- Microalgae have been considered as one of the most promising biomass feedstocks for various industrial applications such as biofuels, animal/aquaculture feeds, food supplements, nutraceuticals, and pharmaceuticals. Several biotechnological challenges associated with algae cultivation, including the small size and negative surface charge of algal cells as well as the dilution of its cultures, need to be circumvented, which increases the cost and labor. Therefore, efficient biomass recovery or harvesting of diverse algal species represents a critical bottleneck for large-scale algal biorefinery process. Among different algae harvesting techniques (e.g., centrifugation, gravity sedimentation, screening, filtration, and air flotation), the flocculation-based processes have acquired much attention due to their promising efficiency and scalability. This review covers the basics and recent research trends of various flocculation techniques, such as auto-flocculation, bio-flocculation, chemical flocculation, particle-based flocculation, and electrochemical flocculation, and also discusses their advantages and disadvantages. The challenges and prospects for the development of eco-friendly and economical algae harvesting processes have also been outlined here.
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