Table 6.1. – Environmental Project No. 1329 2010 – Life Cycle Assessment of Biogas from Separated slurry

Life Cycle Assessment of Biogas from Separated slurry

Table 6.1. Scenario H vs A: Contribution of the different processes to each environmental impact categories selected. Results, for each impact category, are expressed in % of the total positive contributions from the reference scenario (considering the 10 years values, when this applies). Soil JB3 (sandy)^[1]

Impact Categories	GW (10 y)	GW (100 y)	Acidifi- cation	Eutrophi- cation (N) (10 y)	Eutrophi- cation (N) (100 y)	Eutrophi- cation (P)	Ozone formation	Respiratory inorganics	Non-renewable energy	Phosphorus resources
SCENARIO A - pig
A.2 In-house storage	31.7	31.7	60.0	16.3	16.3	0.0	56.2	56.2	0.0	0.0
A.3 Outdoor storage - elect	1.4	1.4	0.3	0.0^[a]	0.0^[a]	0.0^[a]	0.5	0.4	37.0	0.0^[a]
A.3 Outdoor storage	21.4	21.4	8.0	2.4	2.4	0.0	38.7	10.4	0.0	0.0
A.4 Transport to field	1.2	1.2	0.6	0.2	0.2	1.1	1.8	2.5	36.8	0.0^[a]
A.5 Field processes	44.3	51.2	31.1	81.1	89.1	98.8	2.8	30.5	26.2	0.0^[a]
A.6 N fertiliser	-10.6	-14.3	-7.9	-61.1	-67.7	-1.8	-5.8	-12.1	-170.1	0.0^[a]
A.6 P fertiliser	-1.5	-1.5	-2.8	-0.1	-0.1	-121.8	-1.3	-4.5	-51.2	-99.9
A.6 K fertiliser	-0.6	-0.6	-0.2	0.0^[a]	0.0^[a]	-0.5	-0.6	-0.7	-22.2	-0.1
*Sum of positive contributions*	*100*	*107*	*100*	*100*	*108*	*100*	*100*	*100*	*100*	*0.0*^[a]
*Sum of negative contributions*	*-13*	*-16*	*-11*	*-61*	*-68*	*-124*	-8	*-17*	*-244*	*-100*
SCENARIO H
H.2 + H.11 In-house storage	31.7	31.7	60.0	16.3	16.3	0.0	56.2	56.2	0.0	0.0
H.3 + H.12 Pre-tank storage	0.5	0.5	0.1	0.0^[a]	0.0^[a]	0.0^[a]	0.2	0.1	12.6	0.0^[a]
H.4 Separation – elect & equipment	0.2	0.2	0.0^[a]	0.0^[a]	0.0^[a]	0.1	0.1	0.1	6.4	0.0^[a]
H.5 Outdoor storage liquid fraction	13.6	13.6	6.5	1.9	1.9	0.0^[a]	22.5	8.5	8.8	0.0^[a]
Transport (H.6, H.9, H.13, H.19, H.21)	1.4	1.4	0.7	0.2	0.2	1.3	2.1	2.9	43.8	0.0^[a]
H.7 Field processes (liquid fraction)	27.6	33.3	13.4	64.3	71.2	77.6	2.3	13.9	21.5	0.0^[a]
H.8 Storage fibre fraction on-farm	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]	0.0^[a]
H.10 Storage fibre fraction at biogas plant	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
H.14 Storage raw slurry biogas plant	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
H.15 Biogas production	0.6	0.6	0.1	0.0^[a]	0.0^[a]	0.0^[a]	0.7	0.1	7.6	0.0^[a]
H.16 Co-generation heat and power	5.9	5.9	1.9	0.6	0.6	0.0^[a]	7.8	4.5	1.2	0.0^[a]
H.17 Avoided electricity production	-5.8	-5.8	-1.1	-0.1	-0.1	-0.2	-2.2	-1.6	-150.3	0.0^[a]
H.18 Avoided heat production	-1.7	-1.7	-1.3	-0.1	-0.1	-0.2	-1.0	-1.7	-32.4	0.0^[a]
H.20 Outdoor storage (degassed biomass)	2.7	2.7	1.4	0.4	0.4	0.0^[a]	4.5	1.7	3.7	0.0^[a]
H.22 Field processes (degassed biomass)	10.9	12.9	6.4	14.7	18.2	21.2	0.5	6.2	4.5	0.0^[a]
H.23 N fertiliser – production & application on JB3	-10.6	-14.3	-7.9	-61.1	-67.7	-1.8	-5.8	-12.1	-170.1	0.0^[a]
H.23 P fertiliser – production & application on JB3	-1.5	-1.5	-2.8	-0.1	-0.1	-121.8	-1.3	-4.5	-51.2	-99.9
H.23 K fertiliser – production & application on JB3	-0.6	-0.6	-0.2	0.0^[a]	0.0^[a]	-0.5	-0.6	-0.7	-22.2	-0.1
H.23 Yield changes	-0.6	-1.5	-0.5	-2.6	-5.6	-1.7	-0.3	-0.6	-6.1	-1.0
*Sum of positive contributions*	95	*103*	90	98	*109*	*100*	97	94	*110*	*0.0*^[a]
*Sum of negative contributions*	*-21*	*-25*	*-14*	*-64*	*-74*	*-126*	*-11*	*-21*	*-432*	*-101*

[1] The number of digits is not an expression of the uncertainty. All numbers are all rounded and accordingly, if the reader calculates the sum or the difference, it might vary slightly from the numbers shown in the table.

[a] This number is not a zero value.