. 2021 Oct 7;11:19913. doi: 10.1038/s41598-021-99389-4

Table 2.

Substrate physicochemical properties and biomethane potentials.

Parameter (units)	Cow dung	Pig manure	Horse manure
TS (% of wet mass)	14.5 (1.7)	20.4 (2.4)	21.8 (0.8)
VS (% of TS)	88.7 (2.1)	82.8 (2.8)	86.8 (2.4)
C (% of TS)	25.7 (8.3)	27.2 (6)	30.6 (5.7)
H (% of TS)	3.8 (0.8)	4.1 (0.4)	4.2 (0.4)
N (% of TS)	4.9 (1.6)	2.1 (1)	1.5 (0.4)
S (% of TS)	0.2 (0.1)	0.2 (0.0)	0.2 (0.1)
O (% of TS)	54.0 (7.8)	49.2 (8.4)	50.3 (6.7)
Empirical formula	C₃₀₇H₅₄₇O₄₀₄N₅₀S	C₃₃₀H₅₉₀N₂₂O₄₄₇S	C₃₉₆H₆₄₉N₁₇O₄₈₈S
ThOD (gO₂/gVS)	0.41	0.63	0.72
HHV (MJ/t)	4626.8	6287.4	7393.0
BMP_F (ml CH₄/gVS)	144.8	221.6	251.4
BMP_B (ml CH₄/gVS)	144.0	220.6	250.4
BMP_D (ml CH₄/gVS)	122.5	166.4	195.7
BMP_L1 (ml CH₄/gVS)	204 (12)	155 (2)	323 (13)
BMP_L2 (NL CH₄/kgVS)	10.44	14.5	17.09

L1 Reference⁵².

L2 References⁵³.

Physico-chemical results and BMP_L1 are reported as means ± (standard deviations), n = 3.

ThOD theoretical oxygen demand, HHV higher heating value, VS volatile solids; TS total solids, F Forgacs approach, B Buswell approach, D Dulong approach.