Thermophilic Solid-State Anaerobic Digestion of Corn Straw, Cattle Manure, and Vegetable Waste: Effect of Temperature, Total Solid Content, and C/N Ratio

Table 4

ANOVA for the quadratic model of SS-AD biogas production.

Source	Sum of squares	df	Mean square	value	value
Model	128108	9	14234	56.10	<0.0001	Significant
-T	4315	1	4315	17.01	0.0062
-ISC	687	1	687	2.71	0.1510
-C/N	17263	1	17263	68.04	0.0002
,χ2	1973	1	1973	7.78	0.0316
,	11448	1	11448	45.12	0.0005
,	7833	1	7833	30.87	0.0014
χ1^2	54668	1	54668	215.46	<0.0001
	23310	1	23310	91.87	<0.0001
	2848	1	2848	11.22	0.0154
Residual	1522	6	254
Lack of fit	218	2	109	0.33	0.7338	Not significant
Pure error	1304	4	326
Cor total	129630	15
; Adj ;