Harvesting of Dunaliella salina by membrane filtration at pilot scale

Joana Monte, Marta Sá, Cláudia F. Galinha, Luís Costa, Herre Hoekstra, Carla Brazinha, João G. Crespo

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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/(m2 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.

Original languageEnglish
Pages (from-to)252-260
Number of pages9
JournalSeparation and Purification Technology
Volume190
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Cross-flow membrane filtration
  • Dunaliella salina
  • Low-shear spiral plate centrifugation
  • Microalgae harvesting
  • Ultrafiltration

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