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Table 1 Comparison of the geometrical details of the rectors used and the turbulence parameters during the fermentation process

From: Periodic-peristole agitation for process enhancement of butanol fermentation

 

Traditional Rushton impeller

Periodic- peristole reactor

Reactor volume

4 L

4 L

The tank diameter, D

0.14

0.14

The tank height (m), H

0.25

0.25

Mixed mode

Rushton impeller

Peristole

Main Flow type

Axial and radius direction

Axial direction

Impeller diameter (m), d

0.03

–

Number of blades

1

–

Power input (Pm)

23 W

18 W

Agitation rate (rpm)

55

–

Shrinking rate (m/s)

–

0.005

Eddy length (m)

9.54 × 10−5

1.28 × 10−4

Velocity range (m/s)

0–0.173

0–0.0269

The maximum turbulence intensity (%)

2.3

25.7

Mixing time (s)

120

95