Effect of ionic environment on the crossflow microfiltration behaviour of yeast suspensions
| Autor: | Galip Akay, Elif Erhan, Yalçın Kemal Bayhan, Bulent Keskinler |
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| Rok vydání: | 2002 |
| Předmět: |
Chromatography
Facilitated diffusion Chemistry Metal ions in aqueous solution Microfiltration Ionic bonding Filtration and Separation Biochemistry Cell aggregation Yeast Metal Membrane visual_art visual_art.visual_art_medium General Materials Science Physical and Theoretical Chemistry Nuclear chemistry |
| Zdroj: | Journal of Membrane Science. 206:351-360 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/s0376-7388(01)00773-6 |
| Popis: | In this study, the effects of various metal ions, Al 3+ , Cu 2+ , Ni 2+ , Pb 2+ and Na + , on the transient and steady-state crossflow microfiltration behaviour of dilute yeast cell suspensions are investigated. It is observed that in the presence of Pb 2+ and Al 3+ specific cake resistance decreases, while steady-state permeate flux increases. At the same concentration levels, cake resistance for Al 3+ is lower compared with Pb 2+ . Microscopic examinations of the yeast suspension indicate higher levels of yeast cell aggregation in the presence of Al 3+ than Pb 2+ . The specific cake resistance increases with increasing concentrations of Na + , Ni 2+ and Cu 2+ ions whereas the steady-state fluxes decrease. In these cases, cell aggregation is not present except when the concentration of Cu 2+ is 0.4 mM. Consequently, at this concentration level, significant decrease in specific cake resistance is present. The order of the binding affinity of the metals to yeast cell is Al 3+ >Pb 2+ >Cu 2+ >Ni 2+ which is also reflected in the metal ion rejection under identical processing conditions. |
| Databáze: | OpenAIRE |
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