Enhanced biomethane production rate and yield from lignocellulosic ensiled forage ley by in situ anaerobic digestion treatment with endogenous cellulolytic enzymes

Table 4 Amplitude, rate constant and half time for single-phase, first-order kinetics fitted to the decrease and increase in gas production

Process	Equation	A (mL/g VS)	k (day⁻¹)	t _½ (day)	R ²
1st phase decrease	\(y = A \cdot {\text{e}}^{ - kx}\)	51.4	0.432	1.6	0.986
2nd phase increase	\(y = A \cdot \left( {1 - {\text{e}}^{ - kx} } \right)\)	19.5	0.104	6.7	0.972

Half time (t _½) was calculated for first-order kinetics using the relationship \(t_{{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-0pt} 2}}} = \frac{\ln 2}{k}\)

ISSN: 2731-3654