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Life Cycle Assessment of Biogas from Separated slurry
Table G.8 Mass balances for separation of slurry from Dairy cows.
Per 1000 kg of slurry “ex pre-tank”.
| |
Amount in
slurry
ex pre-tank
BEFORE
separation |
Separation
index
(i.e.
percentage
transferred
to fibre
fraction) |
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 |
| |
(from table G.3) |
(from table G.7) |
|
|
Calculation:
Amount in
Fibre fraction *
1000 / 289.19
kg |
Calculation:
Amount in
Liquid fraction *
1000 kg / 710.81
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-housing |
28.919% |
289.19 kg |
1000 kg – 289.19 kg
= 710.81 kg |
1000 kg
Fibre fraction |
1000 kg liquid fraction |
| Dry matter (DM) |
113.2 kg |
79.2% |
113.2 kg
*79.2%
= 89.654 kg |
113.2 kg
*(100-79.2)%
= 23.546 kg |
310.0 kg |
33.1 kg |
| Total-N |
6.34 kg |
50.0% |
6.34 kg
*50.0%
= 3.17 kg |
6.34 kg
*(100-50.0)%
= 3.17 kg |
10.96 kg |
4.46 kg |
| Total-P |
1.03 kg |
68.6% |
1.03 kg
*68.6%
= 0.7066 kg |
1.03 kg
*(100-68.6)%
= 0.3234 kg |
2.44 kg |
0.455 kg |
| Potassium (K) |
5.90 kg |
20% |
5.90 kg
*20%
= 1.18 kg |
5.90 kg
*(100-20)%
= 4.72 kg |
4.08 kg |
6.64 kg |
| Carbon (C) |
49.7 kg |
79.2% |
49.7 kg
*79.2%
= 39.362 kg |
49.7 kg
*(100-79.2)%
= 10.338 kg |
136.11 kg |
14.54 kg |
| Copper (Cu) |
0.0121 kg |
9.0% |
0.0121 kg
*9.0%
=0.00109 kg |
0.0121 kg
*(100-9.0)%
= 0.01101 kg |
0.0038 kg |
0.0155 kg |
| Zinc (Zn) |
0.0234 kg |
11.1% |
0.0234 kg
*11.1%
= 0.00260 kg |
0.0234 kg
*(100-11.1)%
= 0.02080 kg |
0.0090 kg |
0.0293 kg |
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Version 1.0 August 2010, © Danish Environmental Protection Agency
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