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Bio-fouling mitigation by alternative anti-fouling spacer coating materials
Art der Abschlussarbeit
Master
Autoren
- Ahn, Min Hyung
Betreuer
- Prof. Dr. André Lerch
- Dr.-Ing. Nadine Siebdrath
Weitere Betreuer
Dr. Jochen Meier-Haack (Leibniz Institut für Polymerforschung)
Abstract
Biofouling is an on-going challenge in reverse osmosis (RO) systems, and the feed spacer
within the RO membranes showed to have an essential role in biofouling.
In this study, 3 anti-biofouling materials: propolis, chitosan-propolis mixture, and Poly 3-
Sulfopropyl methacrylate potassium salt (PolySPMA) were coated on polypropylene (PP)
surface and tested for surface characteristics. Then a suitable material for the feed spacer
coating was chosen based on the results. Then the effect of coated feed spacer was tested
in a pilot scale RO system.
Although propolis and chitosan-propolis coatings showed hydrophilic, and microscopically
smooth surfaces with least amount of leaching, it was not recommended as an antibiofouling
material. PolySPMA resulted in very hydrophilic, yet microscopically rough
surface with almost half of the grafted constituents lost after leaching test. Reinforcements
were made where PolySPMA of high concentration monomer solution and pre-heated
temperature with long feed spacer incubation time was chosen for pilot plant experiment.
The coated and the uncoated feed spacer containing RO test cells showed significant
differences. Feed channel pressure drop (FCP) increase was almost 3 times less for the
coated than the uncoated. The effect of biofouling on FCP was delayed for 2 days for the
coated feed spacer containing test cell. From the biofilm analysis, fewer amounts of organic
carbon and cells were present on the coated feed spacer compared to the uncoated. The
improved anti-biofouling is most probably responsible due to the strong hydrophilic nature
and presence of negative charge on PolySPMA grafted feed spacer surface.
within the RO membranes showed to have an essential role in biofouling.
In this study, 3 anti-biofouling materials: propolis, chitosan-propolis mixture, and Poly 3-
Sulfopropyl methacrylate potassium salt (PolySPMA) were coated on polypropylene (PP)
surface and tested for surface characteristics. Then a suitable material for the feed spacer
coating was chosen based on the results. Then the effect of coated feed spacer was tested
in a pilot scale RO system.
Although propolis and chitosan-propolis coatings showed hydrophilic, and microscopically
smooth surfaces with least amount of leaching, it was not recommended as an antibiofouling
material. PolySPMA resulted in very hydrophilic, yet microscopically rough
surface with almost half of the grafted constituents lost after leaching test. Reinforcements
were made where PolySPMA of high concentration monomer solution and pre-heated
temperature with long feed spacer incubation time was chosen for pilot plant experiment.
The coated and the uncoated feed spacer containing RO test cells showed significant
differences. Feed channel pressure drop (FCP) increase was almost 3 times less for the
coated than the uncoated. The effect of biofouling on FCP was delayed for 2 days for the
coated feed spacer containing test cell. From the biofilm analysis, fewer amounts of organic
carbon and cells were present on the coated feed spacer compared to the uncoated. The
improved anti-biofouling is most probably responsible due to the strong hydrophilic nature
and presence of negative charge on PolySPMA grafted feed spacer surface.
Zugeordnete Forschungsschwerpunkte
- Membranverfahren der Trink- und Prozesswasseraufbereitung und Abwasserbehandlung
Schlagwörter
Anti-biofouling, feed spacer coatings, propolis, chitosan, PolySPMA
Berichtsjahr
2019