Immersed hollow fibres microfiltration (MF) for removing undesirable micro-algae and protecting semi-closed aquaculture basins

Type Article
Date 2011-08
Language English
Author(s) Castaing Jean-Baptiste1, 2, Masse A.1, Sechet VeroniqueORCID3, Sabiri N. -E.1, Pontie M.1, Haure Joel2, Jaouen P.1
Affiliation(s) 1 : Univ Nantes, LUNAM Univ, CNRS, GEPEA UMR 6144, F-44602 St Nazaire, France
2 : IFREMER, Lab Phycotoxines, Ctr Nantes, F-44311 Nantes, France
3 : IFREMER, Lab Conchylicole Pays de la Loire, F-85230 Polder Des Champs, Bouin, France
Source Desalination (0011-9164) (Elsevier Science Bv), 2011-08 , Vol. 276 , N. 1-3 , P. 386-396
DOI 10.1016/j.desal.2011.03.081
WOS© Times Cited 50
Keyword(s) Red tide, Dinoflagellate, Microfiltration, Membrane fouling mechanisms, Semi-closed aquaculture basins
Abstract In this study, an original use of immersed microfiltration membranes (mean pore size equal to 0.2 mu m) is investigated for the total removal of toxic dinoflagellates from seawater. Using a membrane autopsy and fouling model approach and the use of fouling indexes (called Pore Blocking Index, Pore Constriction Index and Cake Filtration Index), three dinoflagellate suspensions (Heterocapsa triquetra, Alexandrium minutum and Prorocentrum lima) have been microfiltered in order to study the influence of micro-algal species and its concentrations (1,000 and 30,000 cells/mL) on filtration yield and membrane fouling mechanisms. Results showed that all micro-algae have been retained after 180 min of microfiltration. At 30,000 cells/mL, permeate fluxes declined rapidly and an internal fouling occurred at the beginning of microfiltrations followed by a cake deposition. At 1,000 cells/mL, flux declined slowly and was mainly due to an internal fouling. For a given micro-algae concentration, the filtration behaviour and fouling behaviour can be very different based on the micro-algae species. The dissolved organic substances and particulate size distribution are important factors affecting internal but also external fouling. SEM analyses and fouling indexes are useful tools, simple to implement, and allow the study of membrane fouling and membrane process optimization. (C) 2011 Elsevier B.V. All rights reserved.
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