Table 3 Results obtained from first-order model and modified Gompertz model of T group with a SM/CS ratio of 70:30.

From: Process performance and methane production optimizing of anaerobic co-digestion of swine manure and corn straw

Parameters

6.0

6.5

7.0

7.5

8.0

Modified Gompertz model

P

230.5(5.7)a

149.8(4.3)c

137(5.0)c

230(5.4)a

176(5.1)b

Rm

6.4(0.2)c

6.5(0.4)c

8.8(0.3)b

12.12(0.3)a

11.9(0.5)a

λ

16.9(0.1)a

5.4(0.1)c

5.2(0.2)cd

4.8(0.2)d

7.7(0.2)b

Tef

16.1(0.3)c

17.6(0.3)b

14.8(0.2)d

19.2(0.5)a

15.3(0.1)cd

R2

0.996

0.997

0.988

0.999

0.999

First-order model

k

0.0717(0.008)d

0.1156(0.014)c

0.1595(0.01)b

0.2121(0.011)a

0.1596(0.012)b

R2

0.637

0.841

0.931

0.880

0.929

  1. SM: swine manure; CS: corn straw; P: the maximum accumulative methane production predicted using modified Gompertz model (mLg−1-VS); Rm: the maximum methane production rate (mLg−1-VS-d−1); λ: the lag phase (days); Tef: the effective biogas production duration calculated by the time period for 90% of total biogas production (T90) subtracting λ. k: the observed hydrolysis constant (d−1); The letters indicate significant difference at a level of 0.05. The values in parenthesis are the standard errors.
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