Assessing biofouling resistance of a polyamide reverse osmosis membrane surface-modified with a zwitterionic polymer
| Autor: | Miguel Levi Marré Tirado, Mathias Ulbricht, Moshe Herzberg, Viatcheslav Freger, Maria Piatkovsky, Maria Bass |
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| Rok vydání: | 2016 |
| Předmět: |
Chromatography
Chemistry Chemie Filtration and Separation 02 engineering and technology Permeation 021001 nanoscience & nanotechnology Biochemistry Desalination law.invention Biofouling Membrane 020401 chemical engineering Chemical engineering law Surface modification General Materials Science Water treatment 0204 chemical engineering Physical and Theoretical Chemistry 0210 nano-technology Reverse osmosis Filtration |
| Zdroj: | Journal of Membrane Science. 520:490-498 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/j.memsci.2016.07.027 |
| Popis: | Desalination and water treatment by reverse osmosis (RO) can highly increase clean water supply in today's world. However, biofouling of polyamide (PA) RO membranes is a serious obstacle for a wider use of this technology. One of the promising ways of biofouling control is membranes surface modification with zwitterionic polymers. A number of published works showed that zwitterionic coatings can improve the resistance of PA membranes to the initial bacteria adhesion, however no long-term experiments with real treated water effluents were conducted. In this work a commercial PA RO membrane was surface-modified with a zwitterionic polymer and its resistance to biofouling was tested in both short-term bacteria adhesion experiments and longer filtration tests conducted using real treated wastewater effluents, spiked with a small level of nutrients. The obtained results showed that, initially, there was a clear improvement in the biofouling resistance of the modified membranes and their permeation flux remained stable, in contrast to the non-modified counterpart. However, eventually, the permeabilities of the two membranes declined to a similar degree. The results indicate that antifouling coatings might not promise a better membrane performance in long term. The analysis of the biofilms grown on the pristine and the modified membranes suggested that adaptation capabilities of biofilms overcame the favorable changes in surface properties of the membrane achieved by the modification. The presented results emphasized the importance of long-term filtration experiments as an ultimate test for assessing biofouling resistance of the modified desalination membranes. |
| Databáze: | OpenAIRE |
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