Modeling and fouling mechanisms for ultrafiltration of Huanggi (Radix astragalus) extracts

Ming Cai, Sanju Wang, Hanhua Liang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


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 languageEnglish
Pages (from-to)407-412
Number of pages6
JournalFood Science and Biotechnology
Issue number2
Publication statusPublished - 3 May 2013


  • flux decline
  • fouling resistance
  • mechanism
  • Radix astragalus extract
  • ultrafiltration

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Applied Microbiology and Biotechnology


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