期刊
CARBOHYDRATE POLYMERS
卷 240, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116165
关键词
marine microalgae; cellulose nanocrystals; biobased flocculants
资金
- Research Foundation Flanders [G.0608.16N, G.0C60.13N]
- EU Interreg France-Wallonie-Vlaanderen program through the ALPO project
- European Union's European Fund for Regional Development
- Flanders Innovation & Entrepreneurship
- Province of West-Flanders
Flocculation of marine microalgae is challenging because of the high ionic strength of the culture medium. We investigated cationic cellulose nanocrystals (CNCs) as biobased flocculants for the marine microalgae Nannochloropsis oculata, and compared its performance to chitosan. Cationic CNCs induced flocculation at a low dose of 11 mg L-1, while chitosan required a dose of 35 mg L-1. Our cationic CNCs possess a permanent positive charge, allowing flocculation over a wide pH-range (4 to 10). The CNC maximum flocculation efficiency was 90 %, while chitosan achieved > 95 %, attributed to small flocs remaining in suspension for CNCs. However, centrifugation for 1 min at 180 g or gravity filtration using a 30 mu m nylon filter after CNC flocculation resulted in the removal of these small, stable flocs (similar to 150 mu m diam) and > 95% harvesting efficiency. Cationic CNCs can thus serve as a sustainable alternative natural flocculant for harvesting both freshwater and marine microalgae.
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