Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Sustainable Chemical Processes

Table 4 Methane potentials and methane yields of liquid substrates derived from steam-pretreated straw

WIS (%) in SSF	Substrate in AD	Methane potential (NL/kg VS)	Methane g/100 g dry straw
	Hydrolysate	321	4.8
10	Thin stillage	376	1.2
12.5	Thin stillage	392	1.0
15	Thin stillage	410	1.1
17.5	Thin stillage	424	1.0
20	Thin stillage	439	1.0

Methane potentials are expressed as volume of methane produced in normal liter per kg volatile solids, NL/kg VS. Methane yields are expressed as g methane produced per 100 g dry wheat straw