Table 1.

The impact of inoculum to substrate ratio on methane yield for selected substrates.

S/N	Substrate	Inoculum	Inoculum to substrate ratio (ISR)	Methane yield (ml CH4/g VS added)	Average number of days	Reference
1	Ball milled straw (BMS)	Cattle manure	10	<50	150	[70]
			30	>200
			70	>300
2	Kitchen waste	Industrial sludge	0.5	220	25	[71]
			1.0	180
			1.35	200
			2.3	220
3	Maize	Digester sludge from a municipal wastewater treatment plant	3	7023	20	[72]
			2	11,356
			1.5	14,921
			1	23,635