Effects of recycle ratios on process dynamics and operability of a whey ultrafiltration stage

Kevin W K Yee, Alessio Alexiadis, Jie Bao, Dianne E. Wiley

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

There is limited information available to describe how the recycle ratios of the retentate and permeate streams can be used to counteract the effects of fluctuations in feed flowrate and composition on the flowrate and composition of the retentate stream from a whey ultrafiltration (UF) process. Based on dynamic modelling of a single membrane channel and a single-stage membrane module, it was found that the high retentate recycle ratio typically used in industrial UF of whey imposes slow dynamic responses and extensive oscillations on the flowrate and concentration of the retentate after a feedback controller is implemented. Even though the permeate recycle ratio can be used to control the specifications of the retentate, the high retentate recycle ratio used in typical whey UF processing places a limit on how fast the effects of fluctuations in feed flowrate and composition can be mitigated. Since a high retentate recycle ratio is required to improve the productivity of the whey UF process, a tradeoff must be obtained between the productivity and the time required to mitigate the effects of fluctuations in feed flowrate and composition.

Original languageEnglish
Pages (from-to)216-223
Number of pages8
JournalDesalination
Volume236
Issue number1-3
DOIs
Publication statusPublished - 31 Jan 2009
Externally publishedYes

Keywords

  • Operability
  • Process dynamics
  • Ultrafiltration
  • Whey protein concentrates

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Chemistry(all)
  • Materials Science(all)
  • Water Science and Technology

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