Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 190, Issue -, Pages 252-260Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2017.08.019
Keywords
Dunaliella salina; Microalgae harvesting; Cross-flow membrane filtration; Ultrafiltration; Low-shear spiral plate centrifugation
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Funding
- Associate Laboratory for Green Chemistry LAQV - FCT/MEC [UID/QUI/50006/2013]
- ERDF under the PT Partnership Agreement [POCI-01-0145-FEDER - 007265]
- European KBBE FP7 project D-Factory under the topic The CO2 Microalgae Biorefinery
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2016-CPF-2907-05]
- Fundacao para a Ciencia e a Tecnologia, Portugal [SFRH/BPD/79533/2011, SFRH/BPD/95864/2013, SFRH/BD/108894/2015]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/108894/2015] Funding Source: FCT
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The microalgae Dunaliella salina is industrially produced due to its high content in carotenoids induced by low nitrogen and high salinity conditions. D. salina with low carotenoids content also produces other added value compounds, however its recovery have hardly been studied. This work aims to examine the potential of pre concentrating D. salina by membrane processing prior to a final harvesting step by low-shear centrifugation. The aim is to minimize the overall energy expenditure and reduce capital costs, while assuring a minimal loss of cell integrity. This task is challenging, considering the sensitivity of D. salina to shear. Harvesting of D. salina by ultrafiltration allowed reaching a final concentration factor of 5.9, with an average permeate flux of 31 L/(m(2) h). The Total Cost of Ownership and energy consumption for harvesting are respectively 52% and 45% lower when applying a two-step approach with pre-concentration (ultrafiltration) compared to only harvesting by centrifugation.
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