Scale-down characterization of post-centrifuge flocculation processes for high-throughput process development.

Area of Science:

• Chemical Engineering
• Bioprocess Engineering

Background:

• Flocculation is crucial in bioprocessing and water treatment.
• Scaling up flocculation processes from lab to industrial scale presents significant challenges.
• Accurate characterization of flocculation at small scales is needed to predict large-scale performance.

Purpose of the Study:

• To introduce a novel ultra scale-down (USD) methodology for characterizing flocculation.
• To validate the USD method's ability to mimic pilot-scale flocculation performance.
• To investigate the impact of mixing scales on flocculation outcomes.

Main Methods:

• Development of a multiwell, magnetically agitated system compatible with liquid handling robots.
• Comparison of flocculation performance between the USD system and a pilot-scale vessel.
• Analysis of floc size and scale-up correlation success under different mixing scales (macro-, meso-, micro-mixing).

Main Results:

• The USD method successfully mimicked pilot-scale flocculation performance across more than three orders of magnitude in scale-up.
• Mixing scales (macromixing, mesomixing, micromixing) were found to modulate floc size.
• The success of certain literature scale-up correlations was dependent on the mixing scale employed.

Conclusions:

• The developed USD methodology provides a robust platform for flocculation characterization.
• Understanding and controlling mixing scales is critical for accurate flocculation scale-up.
• This USD approach facilitates reliable prediction of industrial-scale flocculation behavior.