Table F.6 – Environmental Project No. 1329 2010 – Life Cycle Assessment of Biogas from Separated slurry

Life Cycle Assessment of Biogas from Separated slurry

Table F.6 Mass balances for gea separation of slurry from fattening pigs (Decanter centrifuge + polymer)
Per 1000 kg of slurry “ex housing”.

	Amount in slurry Ex pre-tank BEFORE separation i.e. “ex housing values from table A.1 in Annex A	Separation index (i.e. percentage transferred to fibre fraction) (from table F.5)	Mass Balance: Amount transferred to the fibre fraction	Mass balance: Amount transferred to the liquid fraction	Composition of the fibre fraction AFTER separation Calculation: Amount in Fibre fraction * 1000 / 228.58 kg	Composition of liquid fraction AFTER separation Calculation: Amount in Liquid fraction * 1000 kg / 771.42 kg
	[per 1000 kg ex pre-tank]		[per 1000 kg ex pre-tank]	[per 1000 kg ex pre-tank]	[kg per 1000 kg fibre fraction]	[kg per 1000 kg liquid fraction]
Total mass	1000 kg Slurry Ex pre-tank	22.858%	228.58 kg	1000 kg – 228.58 kg = 771.42 kg	1000 kg Fibre fraction	1000 kg liquid fraction
Dry matter (DM)	69.7 kg	87.2%	69.7 kg *87.2% = 60.778 kg	69.7 kg *(100-87.2)% = 8.922 kg	265.9 kg	11.57 kg
Total-N	5.48 kg	41.9%	5.48 kg *41.9% = 2.296 kg	5.48 kg *(100-41.9)% = 3.1839 kg	10.045 kg	4.127 kg
NH₄-N	4.11 kg^a)	16.7%	4.11 kg *16.7% = 0.6864 kg	4.11 kg *(100-16.7)% = 3.4236 kg	3.00 kg	4.438 kg
Total-P	1.13 kg	90%	1.13 kg *90% = 1.017 kg	1.13 kg *(100-90)% = 0.113 kg	4.449 kg	0.1465 kg
Potassium (K)	2.85 kg	14.2%	2.85 kg *14.2% = 0.4047 kg	2.85 kg *(100-14.2)% = 2.4453 kg	1.77 kg	3.17 kg
Carbon (C)	33.3 kg	87.2%	33.3 kg *87.2% = 29.04 kg	33.3 kg *(100-87.2)% = 4.26 kg	127.05 kg	5.522 kg
Copper (Cu)	30.0 g	36.2%	0.030 kg *36.2% = 0.01086 kg	0.030 kg *(100-36.2)% = 0.01914 kg	0.0475 kg	0.0248 kg
Zinc (Zn)	89.4 g	42.2%	0.0894 kg *42.2% = 0.0377 kg	0.0894 kg *(100-42.2)% = 0.0517 kg	0.1649 kg	0.0670 kg

a) Assumed to be 75 % of the total N, as in Annex A (table A.1, footnote c)