Table 5.

Different thermal pretreatment applied to the biogas production and yield

S/N	Biomass	Pretreatment	Anaerobic digestion condition	YBP	YAP	Refs
1	Corn stover	Steam explosion	Batch, 37 °C for 28 days	155.4 mL CH4/g VS	217.5 mL CH4/g VS	[231]
2	Rice straw	Hydrothermal 100 °C; 10 min	Glass Bottle 1 L	92 mL/g VS	280 mL/g VS	[228]
3	Reed biomass	Steam explosion 160 °C; 5 min	Digester 0.25 L	188 mL/g VS	226 mL/g VS	[230]
4	Reed biomass	Steam explosion 200 °C; 15 min	Digester 0.25 L	188 mL/g VS	355 mL/g VS	[230]
5	Safflower straw	Hydrothermal 120 °C; 60 min	Glass bottle 0.118 L	96.5 mL/g VS	191.4 mL/g VS	[227]
6	Cocoa pods residues	Hydrothermal 150 °C	Bottle 0.5 L	196.3 mL/g VS	289.3 mL/g VS	[229]
7	Wheat straw	Conventional heating (121 °C for 60 min)	Batch mesophilic		29% increase	[179]
8	Wheat straw	Conventional heating (120 °C for 30 min)	Batch mesophilic		64.3% increase	[112]
9	Maize stalks	Conventional heating (120 °C for 30 min)	Batch mesophilic		No change	[112]
10	Giant reed	Liquid hot water (190 °C for 15 min)	Batch mesophilic		+ 31% vs. 0 mL CH4/g control	[232]