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Optimization of patterned polysulfone membranes for microalgae harvesting.

Zhenyu Zhao1, Ayesha Ilyas1, Koenraad Muylaert2

  • 1Membrane Technology Group (MTG), Division cMACS, Faculty of Bio-Science Engineering, KU Leuven, Celestijnenlaan 200F, PO Box 2454, 3001 Leuven, Belgium.

Bioresource Technology
|April 20, 2020
PubMed
Summary

Novel wave-patterned membranes significantly reduce microalgal fouling and enhance membrane flux. This innovation improves water permeance and harvesting efficiency in microalgal applications.

Keywords:
Algae filtrationCFD modelingMembrane foulingPatterned membranesPolysulfone membranes

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Microalgal fouling is a significant challenge in membrane-based water treatment and biomass harvesting.
  • Existing membrane technologies often suffer from reduced efficiency due to biofouling.

Purpose of the Study:

  • To introduce and evaluate wave-patterned membranes for alleviating microalgal fouling.
  • To investigate the impact of polysulfone (PSF) and polyethylene glycol (PEG) concentrations on membrane morphology and performance.
  • To determine the effect of wave pattern dimensions on fouling prevention and membrane flux.

Main Methods:

  • Membrane fabrication with varying PSF and PEG concentrations.
  • Scanning electron microscopy (SEM) for morphology analysis.
  • Performance testing including clean water permeance, microalgae harvesting efficiency, and membrane flux in real broth.
  • Investigation of wave height and inter-pattern distance effects.
  • Computational fluid dynamics (CFD) simulations.

Main Results:

  • Higher PSF and PEG concentrations led to more pronounced wave patterns.
  • Patterned membranes exhibited higher fluxes and critical pressures compared to flat membranes.
  • Larger wave patterns resulted in increased membrane fluxes and reduced fouling.
  • CFD simulations indicated higher velocity and shear forces at the pattern apexes, contributing to fouling mitigation.

Conclusions:

  • Wave-patterned membranes offer a promising solution for mitigating microalgal fouling.
  • Membrane surface morphology, specifically wave patterns, can be tailored to enhance performance.
  • Optimizing pattern dimensions is crucial for maximizing flux and minimizing fouling in microalgal applications.