Dewatering of algal suspension using microfiltration with cross flow in the presence of magnetite as a filter aid

Abstract

Dewatering algal suspensions is an important step in the extraction of oil and other useful substances from algae. In this study, sphericalNannochloropsissp. and ellipsoidalMonoraphidiumsp. suspensions were dewatered in the presence of different amounts of 350‐nm magnetite particles using a microfiltration membrane with 360‐nm pores in cross‐flow mode. Magnetite functions as a filter aid by reducing the deformation of the cake of filtered algae on the membrane and providing paths for water to flow through the filtration cake of algae. In the case ofNannochloropsissp., the highest dewatering rate was obtained when the number ratio, defined based on the size and ideal density, betweenNannochloropsissp. and magnetite was 1:12.5, but the addition of magnetite had no observable effect on the filtration of ellipsoidalMonoraphidiumsp. suspensions through the membrane. After dewatering, magnetite was effectively separated from the concentrated algal suspension by the application of a magnetic field in an open flow system. Magnetite has the potential to enhance dewatering performance using a cross‐flow membrane system.

Ethanol/Water Separation by Linda Type a Membrane

“…Mem-brane-based processes include Reverse Osmosis, Nano filtration, Dialysis and Pervaporation [18][19][20][21]. And the vacuum evaporation is the cheapest and the most common process [22].And in wine industry, Electro dialysis, Reverse Osmosis, Membrane Contactor are frequently used, but the cross-flow microfiltration(CFMF) [23][24][25][26][27] are widely put into use. However, in the development of CFMF membrane filtration, wine has long been affected by membrane contamination.…”

Ethanol/Water Separation by Linda Type A Membrane

“…Membrane-based processes include Reverse Osmosis, Nano ltration [18][19][20], Dialysis and Pervaporation [21]. And the vacuum evaporation is the cheapest and the most common process [22].And in wine industry, Electrodialysis [23,24], Reverse Osmosis, Membrane Contactor are frequently used, but the cross-ow micro ltration(CFMF) [25][26][27] are widely put into use. However, in the development of CFMF membrane ltration, wine has long been affected by membrane contamination.…”