Table 3 Changes in parameters over incubation period for different temperatures

Total solids (TS) (%)

^a25°C

1.39

0.99

29.06

-

1.37

0.18

0.99 - 1.67

^b37°C

2.05

1.25

38.96

-

1.58

0.20

1.25 - 2.05

^c52.5°C

1.75

0.82

53.20

-

1.43

0.38

0.79 - 2.12

Volatile solids (VS) (%)

25°C

1.12

0.48

57.11

-

0.92

0.27

0.19 - 1.25

37°C

1.65

0.89

45.84

-

1.21

0.19

0.89 - 1.65

52.5°C

1.28

0.48

62.72

-

1.43

0.38

0.48 - 1.88

pH

25°C

7.52

6.86

8.78

-

7.14

0.25

6.78 - 7.56

37°C

7.40

6.53

11.70

-

6.82

0.29

6.34 - 7.40

52.5°C

7.55

9.54

20.86

+

8.95

0.70

7.55 - 9.70

ORP (mV)

25°C

-300

-90

+

-229

124

-353 - 14.70

37°C

-346

-150

+

-314

44

-360 to - 150

52.5°C

-288

-20

+

-111

101

-288 to -10

Biogas (ml); methane (%)

25°C

0

0

0.34; ND

1.42; ND

0 - 5; ND

37°C

0

0

4.4; 40.6

8.1; 20.34

0 - 30; 26 - 55

52.5°C

0

0

18; 56

22; 18

0 - 87; 44 - 70