A new approach for k L a determination by gassing‐out method in pneumatic bioreactors
Abstract BACKGROUND Determination of the volumetric oxygen transfer coefficient ( k L a ) is very important for bioreactor design and process analysis. Among all the methods available, the gassing‐out technique is one of the simplest and most widely used for this task. However, this method is very s...
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| Published in | Journal of chemical technology and biotechnology (1986) Vol. 91; no. 12; pp. 3061 - 3069 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.12.2016
|
| Online Access | Get full text |
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| Summary: | Abstract
BACKGROUND
Determination of the volumetric oxygen transfer coefficient (
k
L
a
) is very important for bioreactor design and process analysis. Among all the methods available, the gassing‐out technique is one of the simplest and most widely used for this task. However, this method is very sensitive to the probe dynamics (due to delay effects), which can lead to inaccuracy in the
k
L
a
determination. This is especially pronounced for airlift bioreactors, where the circulation time affects the initial dynamics of the assay (a transient effect). In the present work, a new method for
k
L
a
determination is proposed.
RESULTS
Values of
k
L
a
and the electrode response time (
τ
e
) were determined experimentally, employing the traditional gassing‐out method and the method proposed here. The latter was shown to be reliable, easier to apply, and suitable for the simultaneous determination of
k
L
a
and electrode sensitivity (
k
e
= 1/
τ
e
), without any need for additional assays.
CONCLUSION
The new method overcomes the effects of probe delay on
k
L
a
determination, making the procedure faster and simpler. © 2016 Society of Chemical Industry |
|---|---|
| ISSN: | 0268-2575 1097-4660 |
| DOI: | 10.1002/jctb.4937 |