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Table 1 Physicochemical characteristics of experimental mixtures

From: Improved biofertilizer properties of digestate from codigestion of brewer’s spent grain and palm oil mill effluent by manure supplementation

Bioreactor

Initial (feed stock)

Final (digestate)

Cumulative biogas yield (mL g−1 VS)

Methane yield (mol %)

TS (%)

VS (%)

pH

TS (%)

VS (%)

pH

A

25.4 ± 0.15d

8.1 ± 0.10d

7.3 ± 0.10b

9.6 ± 0.10a

3.8 ± 0.21a

5.6 ± 0.06b

310

89.9

B

21.6 ± 1.00b

7.3 ± 0.10b

6.9 ± 0.10a

13.5 ± 0.10c

4.6 ± 0.10b

5.3 ± 0.10a

194

75.7

C

23.4 ± 0.10c

7.9 ± 0.10c

7.4 ± 0.10b

11.2 ± 0.10b

3.8 ± 0.10a

5.4 ± 0.10a

241

81.1

D (control)

19.0 ± 1.00a

6.9 ± 0.10a

6.8 ± 0.10a

17.1 ± 0.10b

6.6 ± 0.10c

5.2 ± 0.10a

41

59.3

BSG alone

19.0 ± 0.08

14.2 ± 0.03

7.1 ± 0.01

15.3 ± 0.11

9.5 ± 0.17

6.1 ± 1.00

35

44.4

POME alone

15.9 ± 0.15

4.9 ± 0.01

5.6 ± 0.10

13.9 ± 0.06

4.0 ± 0.09

5.0 ± 0.12

27

37.5

  1. Similar superscript letters mean not significantly different in mean (p > 0.05), while different superscript letters mean significantly different (p < 0.05); A—D indicate bioreactors with different waste composition (n = 3)