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Table 2 Summary of the process parameters of different foam-free processes

From: Foam-free production of Surfactin via anaerobic fermentation of Bacillus subtilis DSM 10T

 

Chtioui et al. 2012

Coutte et al. 2010

The current study

Willenbacher et al. 2014

Surfactin producer

Bacillus subtilis ATCC 21332

Bacillus subtilis ATCC 21332

Bacillus subtilis DSM 10T

Bacillus subtilis DSM 10T

Fermentation approach

Rotating discs

Membrane bioreactor

Anaerobic, no gas flow

Foam fractionation

Cultivation time [h]

72

72

55

30

Max. cSurfactin [g/L]

0.212*

0.242*

0.087

3.995 (foam)

YP/X [g/g]

0.068

0.078*

0.278

0.192

YX/S [g/g]

0.189

0.164*

0.120

0.268

YP/S [g/g]

0.013

0.013

0.033

0.052

qSurfactin [g/(g∙h)]

0.001*

0.001*

0.005

0.006

vol. qSurfactin [g/(L∙h)]

0.003*

0.003*

0.002

0.018

  1. *the values were calculated during the current study, using data of Chtioui et al. 2012 and Coutte et al. 2010 (mSurfactin, CDW, cultivation time and cultivation volume).
  2. Comparison of different foam-free Surfactin production processes regarding their process parameters and collation with a fermentation process applying foam fractionation [2].