Impact of granular filtration on ultrafiltration membrane performance as pre-treatment to seawater desalination in presence of algal blooms
|Author(s)||Sabiri Nour-Eddine1, Sechet Veronique2, Jaouen Pascal1, Pontie Maxime1, Masse Anthony1, Plantier Severine1|
|Affiliation(s)||1 : Univ Nantes, GEPEA, UMR CNRS 6144, 37 Bd Univ,BP 406, St Nazaire, France.
2 : Ctr Nantes, IFREMER, Lab Phycotoxines, BP 21105, F-44311 Nantes, France.
|Source||Journal Of Water Reuse And Desalination (2220-1319) (Iwa Publishing), 2018-06 , Vol. 8 , N. 2 , P. 262-277|
|WOS© Times Cited||1|
|Keyword(s)||algal bloom, fouling, granular filtration, pre-treatment, seawater, ultrafiltration|
To mitigate fouling of the ultrafiltration (UF) membrane and improve permeate quality, we coupled granular filters (GF) with UF membrane as a pre-treatment for reconstituted seawater in the presence of algal bloom. Mono and bilayer granular filtrations were led at a mean velocity of 10 m h(-1) over a 7-hour period. Both GF gave the same algal cell retention rate (similar to 63%) after 7 hours of filtration. Turbidity reduction rate was 50% for the monolayer filter and 75% for the bilayer filter. Resulting organic matter removal rate was 10% for the monolayer filter and 35% for the bilayer filter. Dissolved organic carbon removal was low (20%) with the bilayer filter and non-existent with the monolayer filter. GF-coupled UF reduced humic acids in the permeate (20%) compared with UF alone. Peak pressure of 3 bars was reached at the end of 30 minutes of UF in both direct UF or UF after monolayer GF. The filtrate from the bilayer GF enables UF over a longer period (7 hours).