Abstract
A semi-empirical model has been developed in ultrafiltration of huanggi (Radix astragulus) extracts. Three major fouling resistances were quantified with transmembrane pressure (TMP) ranged from 0. 4 to 0. 8 bar and process time lasted for 120 min. Adsorption grew fast at the initial 15 min and its contribution was more significant at 0. 4 bar, nearly 50%. Pore blocking almost kept the same values of 1. 28, 1. 84, and 2. 39 at pressures of 0. 4, 0. 6, and 0. 8 bar, respectively. Cake layer grew linearly at 0. 4 bar but it increased rapidly as the TMP arose. With the TMP increased, the contribution of cake layer became more significant, almost 75% at 0. 8 bar which was triple of that at 0. 4 bar. Prediction of flux decline fitted quite well with the experimental data, all within 5% errors. It demonstrates that adsorption, pore blocking, and cake layer are the main mechanisms for membrane fouling during the process.
Original language | English |
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Pages (from-to) | 407-412 |
Number of pages | 6 |
Journal | Food Science and Biotechnology |
Volume | 22 |
Issue number | 2 |
DOIs | |
Publication status | Published - 3 May 2013 |
Keywords
- flux decline
- fouling resistance
- mechanism
- Radix astragalus extract
- ultrafiltration
ASJC Scopus subject areas
- Biotechnology
- Food Science
- Applied Microbiology and Biotechnology