Recovery of Bioproducts from Treated Fermentation Liquors by a Hybrid Membrane and Salting-Out Process
| Autor: | Ying-Shr Chen, 陳英仕 |
|---|---|
| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 This research utilizes a hybrid process of membrane ultrafiltration and salting-out effect, for the recovery of bioproducts from treated fermentation liquors. The best operating conditions for this purpose were determined. Ultrafiltration experiments were conducted in two types of process; that is dead-end and cross-flow modes, under various operating conditions to discuss the rejection (%). The ultrafiltration process is affected by concentration polarization and fouling phenomenon, resulting in a flux decline. In order to improve the flux, the membrane module was repeatedly washed in the cross-flow system. The blocking filtration laws and resistance-in-series model, coupled with the mass balance theory, have been proposed to analyze the effects of operating parameters on the flux behavior and the resistances in the ultrafiltration of treated fermentation liquors. An equation was used to predict the permeate flux of ultrafiltration. The blocking filtration phenomena mainly rely on cake filtration. In the resistance-in-series model, the resistances caused by concentration polarization and cake filtration increase with increasing transmembrane pressure. It was shown that concentration polarization plays the most important role in the resistance of filtration. A theoretical equation was obtained for predicting permeate flux. The model prediction of the permeate flux agree well with the experimental data. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|