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Table 2 Effects of pretreatment temperature and fermentation conditions on hydrogen production from algal biomass sonicated for 15 min at a given frequency and acoustic power

From: Ultrasonic disintegration of microalgal biomass and consequent improvement of bioaccessibility/bioavailability in microbial fermentation

Sonication temperature (°C)

Fermentation temperature (°C)

AB/FB ratio (v/v)a

pHib

pHfc

Glucose (g)d

Lag time, λ (hr)

H2yield (mol H2 mol-1glucose)

Hmaxe(L L-1)

Rmaxf(L L-1 h-1)

Note

45

35

0.2

5.7

5.5

0.09

11

1.6

0.72

0.02

 

0.4

6.4

5.6

0.18

12

1.5

1.39

0.04

 

1.0

6.8

5.4

0.44

12

1.6

2.51

0.16

 
 

1.0g

6.4

5.7

0.50

9

1.9

2.99

0.18

starch

55

0.2

5.8

5.6

0.09

2

1.5

0.87

0.03

 

0.4

6.4

5.4

0.18

3

1.7

1.48

0.13

 

1.0

6.7

5.3

0.44

2

1.9

2.72

0.27

 
  

1.0g

6.5

5.4

0.50

2

1.9

3.41

0.31

starch

65

35

0.2

5.7

5.4

0.09

12

1.6

0.88

0.03

 

0.4

6.3

5.6

0.18

11

1.8

1.36

0.06

 
 

1.0

6.8

5.7

0.44

11

1.8

2.94

0.15

 

55

0.2

5.9

5.4

0.09

2

1.7

0.92

0.04

 

0.4

6.2

5.6

0.18

3

1.8

1.33

0.14

 
  

1.0

6.6

5.6

0.44

3

1.8

2.91

0.30

 
  1. a The volumetric ratio of algal biomass (AB) to fermentative bacteria (FB); b initial pH; c final pH; d glucose content in 50 mL of either algal suspension or liquid starch; e maximum accumulative H2 production; f maximum H2 production rate; g the volumetric ratio of non-sonicated liquid starch to fermentative bacteria (FB).