Comparative efficiency of bio-coagulants Chitosan and tannin-based coagulant in coagulation-flotation separation of Chlorella sp. in saline media
Pappa, M.; Lama, S.; Adriaensens, P.; Marchal, W.; Vandamme, D. (2025). Comparative efficiency of bio-coagulants Chitosan and tannin-based coagulant in coagulation-flotation separation of Chlorella sp. in saline media. Bioresour. Technol. 438: 133185. https://dx.doi.org/10.1016/j.biortech.2025.133185
In: Bioresource Technology. Elsevier: Barking. ISSN 0960-8524; e-ISSN 1873-2976, more
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| Author keywords |
Algal organic matter;Bridging;Microalgae;Stationary phase;Sweeping;algogenic organic-matter;cyanobacteria;flocculation;polymers |
| Authors | | Top |
- Pappa, M.
- Lama, S.
- Adriaensens, P.
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- Marchal, W.
- Vandamme, D., more
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| Abstract |
Marine microalgae are rich in valuable compounds, which cannot be commercialized due to difficulties in scaling-up. Chlorella sp. is harvested using bio-coagulants at 0-3 % salt with dissolved air flotation. Chitosan was compared with Tanfloc MTH, focusing on the algal organic matter (AOM) impact. Chitosan's separation efficiency (eta%) decreased with increasing salt concentration and by the presence of AOM. Chitosan induced moderate eta% (> 75 %) a=via bridging for 0,-1 % salt media, while no mechanism caused sufficient separation at 2-3 % salt. Tanfloc MTH induced lower eta% than chitosan at 0 % salt, but outperformed at 2-3 % salt. AOM hindered Tanfloc MTH efficiency, inducing > 75 % only with 0.4 and 0.8 mg mg(-1) at 0-2 and 3 % salt, respectively. Neither coagulants are recommended for marine microalgae due to the excessively high dosage requirements. Research should focus on exploring alternative coagulants or variations of Tanfloc. |
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