Preparation of antifouling ultrafiltration membranes by addition of polyelectrolytes to the coagulation bath

Tatiana Plisko, Alexandr Bildyukevich, Frank Lipnizki, Gregor Rudolph

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

Nowadays, the main challenge in designing ultrafiltration membranes is increasing membrane fouling resistance without sacrificing membrane transport properties. Novel method of modification of ultrafiltration membranes using aqueous solutions of commercially available cationic and anionic polyelectrolytes based on acrylamide copolymers is proposed. Polyelectrolytes based on acrylamide copolymers are utilized as flocculants for drinking water treatment. The main idea of this study is that using aqueous solutions of polyelectrolytes as coagulation medium upon membrane preparation via phase inversion technique leads to the modification of the skin layer due to immobilization of the charged macromolecules of polyelectrolytes. Due to the extremely high molecular weight of commercially available flocculants (M ≥ 5-10 106 Da), their introduction to the coagulation bath is expected to change the viscosity of the coagulation medium which results in the changes of the kinetics of the phase inversion process. The influence of the chemical nature of the polyelectrolytes and their concentration in the coagulation bath on the physio-chemical properties, charge, hydrophilic/hydrophobic balance of the skin layer, structure, transport properties and antifouling resistance of the membrane was studied. Modification of polymer membranes via addition of polyelectrolytes to the coagulation bath was found to be an effective approach to increase membrane antifouling stability toward natural organic matter in the process of the filtration of surface water and significantly increase the flux of ultrafiltration membranes (via modification by anionic polyelectrolyte).
Original languageEnglish
Title of host publicationNordic Filtration 2018
Publication statusPublished - 2018

Subject classification (UKÄ)

  • Chemical Engineering

Keywords

  • membrane filtration

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