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Table 2 Oxygen transfer rate and BD production performances obtained in the agricultural byproduct tests with 95% confidence intervals, and corresponding average values obtained in the standard medium tests with OTR values in the 6–8 mmol/h/L range

From: Effect of oxygen mass transfer rate on the production of 2,3-butanediol from glucose and agro-industrial byproducts by Bacillus licheniformis ATCC9789

Test ID

Type of medium

OTR (mmol L/h)

\(q_{{{\text{O}}_{2} }}\) (mmol/gCDW/h)

YBD (gBD/gsugar)

PBD (g/L/h)

rBD (g/L/h)

BP-1

Glucose + CMBMa

6.1 ± 0.7

1.4–0.7

0.38 ± 0.03

0.35 ± 0.03

0.58 ± 0.05

BP-2

Molasses + CMBMa

5.8 ± 0.7

1.2–0.8

0.22 ± 0.02

0.54 ± 0.05

1.38 ± 0.13

BP-3

Molasses + CMBMa

8.2 ± 1.0

1.7–1.2

0.25 ± 0.02

0.42 ± 0.04

1.07 ± 0.10

BP-4

Molasses + CMBMa

13.1 ± 1.6

3.1–1.6

0.20 ± 0.02

0.43 ± 0.04

1.10 ± 0.10

Standard medium tests in the optimal rangeb

Standard

7–15

1.4–7.9

0.44 ± 0.02b

0.91 ± 0.05b

1.49 ± 0.15b

  1. aChicken meat and bone meal
  2. bAverage value obtained in the standard medium tests characterized by an OTR in the 7–15 mmol/h/L range, with 95% confidence interval