Division Typical and default values – biogas for electricity – mixtures of manure and maize: greenhouse gas emissions with shares given on a fresh mass basis

United Kingdom

Biogas production system		Technological options	Greenhouse gas emissions – typical value(g CO₂eq/MJ)	Greenhouse gas emissions – default value(g CO₂eq/MJ)
Manure – Maize 80 % - 20 %	Case 1	Open digestate	17	33
	Case 1	Close digestate	– 12	– 9
	Case 2	Open digestate	22	40
	Case 2	Close digestate	– 7	– 2
	Case 3	Open digestate	23	43
	Case 3	Close digestate	– 9	– 4
Manure – Maize 70 % - 30 %	Case 1	Open digestate	24	37
	Case 1	Close digestate	0	3
	Case 2	Open digestate	29	45
	Case 2	Close digestate	4	10
	Case 3	Open digestate	31	48
	Case 3	Close digestate	4	10
Manure – Maize 60 % - 40 %	Case 1	Open digestate	28	40
	Case 1	Close digestate	7	11
	Case 2	Open digestate	33	47
	Case 2	Close digestate	12	18
	Case 3	Open digestate	36	52
	Case 3	Close digestate	12	18

Notes on Division D

f1: This group of materials includes agricultural residues with a low bulk density and it comprises materials such as straw bales, oat hulls, rice husks and sugar cane bagasse bales (not exhaustive list).
f2: The group of agricultural residues with higher bulk density includes materials such as corn cobs, nut shells, soybean hulls, palm kernel shells (not exhaustive list).