Table 4.

Differences in microbial composition at the phylum level during dry co-digestion of food waste and pig manure using four different operating conditions (mean ± SD)

Relative abundance (%)	R1 (digestate, FW/PM = 50:50)	R2 (digestate, FW/PM = 75:25)	R3 (sludge, FW/PM = 50:50)	R4 (sludge, FW/PM = 75:25)
Euryarchaeota	5.0 ± 2.2	7.9 ± 4.0	4.0 ± 1.8	7.4 ± 5.2
Actinobacteria	2.5 ± 0.3	2.8 ± 0.5	6.3 ± 1.2	5.9 ± 1.3
Bacteroidetes	28.9 ± 8.8	18.5 ± 10.5	10.9 ± 5.0	7.6 ± 2.0
Chloroflexi	1.1 ± 0.3	1.0 ± 0.4	7.5 ± 2.3	7.5 ± 2.8
Firmicutes	49.9 ± 4.7	52.4 ± 2.5	39.4 ± 7.4	33.7 ± 8.0
Proteobacteria	4.4 ± 0.5	6.0 ± 1.1	14.8 ± 2.3	18.3 ± 5.3
Synergistetes	2.4 ± 0.3	3.1 ± 0.4	7.0 ± 1.5	6.7 ± 1.1
Thermotogae	4.2 ± 1.5	5.9 ± 3.3	2.6 ± 1.3	3.5 ± 1.0
WWE1	0.3 ± 0.1	0.3 ± 0.2	2.2 ± 1.1	3.4 ± 1.2

Groups	Statistical analysis (P values)
	Condition	Inoculum	FW/PM	R1 vs R2	R1 vs R3	R1 vs R4	R2 vs R3	R2 vs R4	R3 vs R4	Phase	Phase I vs II	Phase I vs III	Phase II vs III
Euryarchaeota	0.040*	0.149	0.014*	0.945	1.000	1.000	0.035*	1.000	0.235	0.000***	0.003**	0.000***	0.016*
Actinobacteria	0.000***	0.000***	0.706	1.000	0.000***	0.000***	0.000***	0.001***	1.000	0.725	1.000	1.000	1.000
Bacteroidetes	0.000***	0.000***	0.019*	0.235	0.000***	0.000***	0.228	0.005**	1.000	0.023*	0.669	0.019**	0.229
Chloroflexi	0.000***	0.000***	0.935	1.000	0.000***	0.000***	0.000***	0.000***	1.000	0.157	1.000	1.000	1.000
Firmicutes	0.000***	0.000***	0.922	1.000	0.007**	0.000***	0.000***	0.000***	1.000	0.030*	0.264	0.025*	0.715
Proteobacteria	0.000***	0.000***	0.039*	0.278	0.000***	0.000***	0.012*	0.000***	1.000	0.276	0.320	0.105	0.490
Synergistetes	0.000***	0.000***	0.195	0.171	0.000***	0.000***	0.002**	0.007**	1.000	0.983	1.000	1.000	1.000
Thermotogae	0.003**	0.001**	0.105	1.000	0.099	1.000	0.003**	0.119	1.000	0.002**	0.004**	0.006**	1.000
WWE1	0.000***	0.000***	0.251	1.000	0.001***	0.000***	0.001***	0.000***	0.866	0.265	1.000	1.000	1.000

Only phyla with a relative abundance > 5% in at least one sample are shown

*** P < 0.001, ** P < 0.01, * P < 0.05