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The overall volumetric oxygen transfer coefficient in high viscosity, alginate-rich media

Biochemical Engineering Journal, ISSN: 1369-703X, Vol: 215, Page: 109620
2025
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Article Description

Understanding the impact of alginate, or similar high-viscosity polymers, on the oxygen transfer in aerobic bioprocess is critical in bioprocess development. Further, in the case of alginate lyase production, it is common for the media to also include significant concentrations of NaCl, which alters the ionic strength and impacts K L a. The results show that in alginate containing media, as the concentration of alginate increases, the fluid viscosity increases, leading to the reduction in K L a. However, comparison of the water-air and water-alginate-air systems revealed that at increased agitation rates (i.e. > 200 rpm) the K L a is enhanced in the water-alginate-air system as compared to the water-air system. This enhancement of K L a was seen up to 10.5 g/L of alginate. We propose this is due to two competing effects. Under lower alginate concentration, the influence of NaCl on bubble size and formation properties enhanced K L a in comparison to the water-air system. However, an additional increase in alginate concentration resulted in the reduction of K L a as the effect of increased viscosity, which reduces the liquid phase mass transfer, became the dominant effect. These results suggest that for fermentation utilising viscous media, operating under lower alginate concentrations may prevent oxygenation issues. Furthermore, the observations made emphasise the need to consider additives such as NaCl in fermentation media when estimating K L a.

Bibliographic Details

Matthew N. Noach; Robert W.M. Pott; Neill J. Goosen; Eugéne Van Rensburg

Elsevier BV

Biochemistry, Genetics and Molecular Biology; Chemical Engineering; Environmental Science; Engineering

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