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Life Cycle Assessment of Biogas from Separated slurry
Table H.2. Mass balances for mechanical separation of slurry from fattening pigs.
Per 1000 kg of slurry “ex-housing”.
| |
Amount in
slurry
Ex pre-tank
BEFORE
separation |
Separation
index
(from table
C.2, unless
otherwise
specified) |
Mass
Balance:
Amount
transferred
to the
fibre
fraction |
Mass
balance:
Amount
transferred
to the
liquid
fraction |
Composition of
the fibre fraction
AFTER
separation |
Composition of
liquid fraction
AFTER
separation |
| |
(values from
table H.1) |
|
|
|
Fibre fraction *
1000 / 51.98 kg |
Liquid fraction *
1000 kg / 948 kg |
| |
[per 1000 kg
ex pre-tank] |
|
[per 1000 kg
ex pre-tank] |
[per 1000 kg
ex pre-tank] |
[kg per 1000 kg
fiber fraction] |
[kg per 1000 kg
liquid fraction] |
| Total mass |
1000 kg
slurry
ex pre-tank |
5.198% a) |
51.98 kg |
1000 kg – 51.98 kg
= 948.02 kg |
1000 kg
Fibre fraction |
1000 kg liquid
fraction |
| Dry matter (DM) |
69.7 kg |
29.6% |
69.7 kg
*29.6%
= 20.63 kg |
69.7 kg
*(100-29.6)%
= 49.07 kg |
396.9 kg |
51.76 kg |
| Total-N |
5.48 kg |
6.8% |
5.48 kg
*6.8%
= 0.3726 kg |
5.48 kg
*(100-6.8)%
= 5.1074 kg |
7.17 kg |
5.387 kg |
| Total-P |
1.13 kg |
9.1% |
1.13 kg
*9.1%
= 0.102 kg |
1.13 kg
*(100-9.1)%
= 1.027 kg |
1.962 kg |
1.0833 kg |
| Potassium (K) |
2.85 kg |
2.9% |
2.85 kg
*2.9%
=0.08265 kg |
2.85 kg
*(100-2.9)%
= 2.767 kg |
1.59 kg |
2.9187 kg |
| Carbon (C) |
33.3 kg |
No data
Assumed:
29.6% |
33.3 kg
*29.6%
= 9.859 kg |
33.3 kg
*(100-29.6)%
= 23.443 kg |
189.67 kg |
24.728 kg |
| Copper (Cu) |
30.0 g |
4.6% |
30.0 g
*4.6%
= 1.38 g |
30.0 g
*(100-4.6)%
= 28.62 g |
26.549 g |
30.189 g |
| Zinc (Zn) |
89.4 g |
6.3% |
89.4 g
*6.3%
= 5.632 g |
89.4 g
*(100-6.3)%
= 83.768 g |
108.35 g |
88.361 g |
| Water content |
1000 kg - 69.7 kg
= 930.3 kg |
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31.35 kg c) |
898.95 kg |
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a) The separation index for the mass (3.3%) from table C.2 has not been used as it gave unrealistic results for both the fibre fraction and the liquid fraction. The calculation of the total mass is therefore based on measurements of the fibre fraction, which has a DM of 39.69%. When the DM is 39.69%, and the total DM is 20.63 kg, the total mass is 20.63 kg * 100/39.69 = 51.98 kg. This gives a separation index of (51.98 kg/1000 kg) * 100 % = 5.198 %.
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Version 1.0 August 2010, © Danish Environmental Protection Agency
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