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Effects of periodic backflushing on ultrafiltration performance.
1Bioprocess Engineering Research Center, Korea Advanced Institute of Science and Technology, Seoul.
Bioseparation
|January 1, 1991
Summary
Periodic backflushing significantly enhances membrane separation performance. This technique more than doubles permeability and enables long-term filtration of yeast cells.
Area of Science:
- Biochemical Engineering
- Separation Science
Background:
- Membrane fouling limits the efficiency and longevity of membrane separation processes.
- Optimizing operational parameters is crucial for improving filtration performance.
Purpose of the Study:
- To investigate the impact of periodic backflushing on ultrafiltration membrane performance.
- To determine the optimal backflushing frequency and duration for enhanced filtration.
Main Methods:
- Utilized an Amicon hollow fiber ultrafiltration membrane system (H1P30-43, MWCO = 30,000).
- Employed hemoglobin and dextran as model compounds to assess filtration.
- Measured apparent permeability and dextran retention coefficient under varying backflushing conditions.
Main Results:
- An optimal backflushing frequency of approximately 0.2 min⁻¹ was identified, maximizing permeability.
- Periodic backflushing more than doubled the membrane system's permeability.
- Increased backflushing duration reduced dextran retention, achieving <50% with 33.75s duration.
- Dextran output increased 1.3-fold with optimized backflushing.
- Enabled over 20 hours of continuous yeast cell filtration.
Conclusions:
- Periodic backflushing is an effective strategy to enhance ultrafiltration performance and mitigate fouling.
- Optimized backflushing parameters significantly improve permeability and product recovery.
- The method supports sustained filtration of biological materials like yeast cells.