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Life Cycle Assessment of Biogas from Separated slurry

Table G.27. Mass balances for separation of the degassed biomass.
Per 1000 kg of degassed biomass mixture “ex-digester”.

  Amount in
degassed
biomass
mixture
BEFORE
separation		 Separation
index from
table G.26		 Mass
Balance:
Amount
transferred to
the fibre
fraction		 Mass
balance:
Amount
transferred to
the liquid
fraction		 Composition of
the degassed
fibre fraction
AFTER
separation		 Composition of
degassed liquid
fraction
AFTER
separation
          Fibre fraction *
1000 / 245.6 kg		 Liquid fraction *
1000 kg / 754.4 kg
  [per 1000 kg
ex-digester]		   [per 1000 kg
ex-digester]		 [per 1000 kg
ex-digester]		 [kg per 1000 kg
fibre fraction]		 [kg per 1000 kg
liquid fraction]
Total mass 1000 kg
slurry
ex-digester		 24.56% 245.6 kg 1000 kg –
245.6 kg
= 754.4 kg		 1000 kg
Degassed fibre fraction		 1000 kg
degassed liquid
fraction
Dry matter (DM) 107.73 kg 60.9% 107.73 kg *60.9%
= 65.61 kg		 107.73 kg *
(100-60.9)%
= 42.12 kg		 267.1 kg 55.83 kg
Total-N 7.64 kg 21.2% 7.64 kg *21.2%
= 1.62 kg		 7.64 kg *
(100-21.2)%
= 6.02 kg		 6.60 kg 7.98 kg
Total-P 1.381 kg 66.2% 1.381 kg *66.2%
= 0.914 kg		 1.381 kg *
(100-66.2)%
= 0.467 kg		 3.72 kg 0.62 kg
Potassium (K) 5.828 kg 9.7% 5.828 kg *9.7%
=0.565 kg		 5.828 kg *
(100-9.7)%
= 5.263 kg		 2.30 kg 6.98 kg
Carbon (C) 45.699 kg 60.9% 45.699 kg *60.9%
= 27.83 kg		 45.699 kg *
(100-60.9)%
= 17.87 kg		 113.3 kg 23.69 kg
Copper (Cu) 0.0111 kg 6.7 % 0.0111 kg *6.7%
= 0.0007 kg		 0.0111 kg *
(100-6.7)%
= 0.0104 kg		 0.003 kg 0.014 kg
Zinc (Zn) 0.0216 kg 25.3% 0.0216 kg
*25.3%
= 0.0055 kg		 0.0216 kg
*(100-25.3)%
= 0.0161 kg		 0.022 kg 0.0213 kg

 

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Version 1.0 August 2010, © Danish Environmental Protection Agency