Harvesting microalgal biomass using negatively charged polysulfone patterned membranes: Influence of pattern shapes and mechanism of fouling mitigation

WATER RESEARCH

卷:188

Article

Zhao, Zhenyu¹  Muylaert, Koenraad²  Szymczyk, Anthony³  Vankelecom, Ivo F. J.¹ 

[1] Katholieke Univ Leuven, Div cMACS, Membrane Technol Grp MTG, Fac Biosci Engn, Celestijnenlaan 200F,POB 2454, B-3001 Leuven, Belgium

[2] KU Leuven KULAK, Lab Aquat Biol, Microbial Mol Syst, E Sabbelaan 53, B-8500 Kortrijk, Belgium

[3] Univ Rennes 1, Inst Sci Chim Rennes, UMR CNRS 6226, 263 Ave Geral Leclerc, F-35042 Rennes, France

关键词: Patterned membrane;    Computational fluid dynamics;    Cross-flow filtration;    XDLVO;    Interaction energy;    Membrane technology;    Membrane development;   

DOI  :  10.1016/j.watres.2020.116530

来源: Elsevier

【 摘 要 】

Membranes have a lot of potential for harvesting microalgae, but membrane fouling is hampering their breakthrough. In this study, the effects of charge and corrugated surface on membrane filtration performance were investigated. The clean water permeance (CWP), the microalgae harvesting efficiency and the membrane flux for a microalgal broth were determined using patterned polysulfone (PSf) membranes with different shapes of the surface patterns and containing different charge densities by blending sulfonated polysulfone (sPSf). The flow behavior near the patterned membrane surface, as well as the interaction energy between membrane and microalgae were investigated using computational fluid dynamics (CFD) simulation and the improved extended Derjaguin, Landau, Verwey, Overbeek(XDLVO) theory, respectively. Membrane charge and pattern shape significantly improve the membrane performance. The critical pressures of all sPSf blend patterned membranes were higher than 2.5 bar. A 4.5w% sPSf blend patterned membranes with wave patterns showed the highest CWP (2300 L/m(2) h bar) and membrane flux in the microalgal broth (10 00 L/m(2) h bar) with 100% harvesting efficiency. XDLVO analysis showed that sPSf blend patterned membranes prepared obtained the lowest interaction energy and highest energy barrier for microalgal attachment. CFD simulation showed a higher velocity and wall shear on the pattern apexes. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free