Biogas [6]

Name: Test Sample Order #: 651
Type: Other Analysed: Mar 27 2019
Form: Solid Consistency: Homogeneous
Acidity: Neutral pH: 6.80
 
Summary of Analytical Procedure

This biomethane potential (BMP) test was performed using active inoculum from an anaerobic digester. The inoculum has been tested for its quality and degassed to avoid interference of organic matter present in the inoculum with the test sample. The volume to headspace ratio of the digester is 7:3 and the inoculum to substrate ratio is 4:1. German standard methods (VDI 4630) are used in determining the BMP of the sample.

Biogas and Biomethane Potential (BMP)

After 28 Days of Digestion at 35oC

Biogas and Biomethane Yields



Biogas
Potential
(l/kg VS) 		BMP

(l/kg VS) 		Biogas
Potential
(l/kg Dry Matter) 		BMP

(l/kg Dry Matter) 		Biogas
Potential
(l/kg Fresh Weight) 		BMP

(l/kg Fresh Weight)
AV. 634 359 365 207 286 162
Rep 1 625 353 360 203 282 159
Rep 2 623 352 358 202 281 159
Rep 3 652 370 375 213 294 167
SD 16 10 9 6 7 5


Additional Biogas Statistics



Day
Max. biogas production reached at day 28
70% of total biogas reached at day 4
80% of total biogas reached at day 4
90% of total biogas reached at day 11
<1% gas production reached at day 9

Biogas Composition

CH4 (%) CO2 (%) O2 (%) H2S (ppm) NH3 (ppm)
Gas Collected over Days 1-3
AV. 54.4 39.9 0.4 169 78
Rep 1 54.4 39.7 0.5 172 79
Rep 2 54.2 40.1 0.4 170 73
Rep 3 54.5 39.8 0.4 165 82
SD 0.2 0.2 0.1 3 5
Gas Collected over Days 4-7
AV. 61.7 33.7 0.2 227 90
Rep 1 61.1 33.9 0.2 229 92
Rep 2 61.8 33.4 0.1 227 89
Rep 3 62.0 33.7 0.2 225 88
SD 0.5 0.3 0.1 2 2
Gas Collected over Days 8-14
AV. 61.0 34.1 0.3 158 78
Rep 1 60.7 34.2 0.3 161 80
Rep 2 61.1 33.9 0.2 158 78
Rep 3 61.2 34.1 0.3 155 77
SD 0.3 0.2 0.1 3 2
Gas Collected over Days 15-21
AV. 62.0 33.1 0.3 153 80
Rep 1 61.7 33.2 0.3 159 82
Rep 2 62.1 32.9 0.2 142 80
Rep 3 62.2 33.1 0.3 157 79
SD 0.3 0.2 0.1 9 2
Gas Collected over Days 22-28
AV. 61.9 33.0 0.3 158 82
Rep 1 61.9 33.3 0.3 162 84
Rep 2 61.9 32.8 0.2 152 82
Rep 3 62.0 33.0 0.3 161 81
SD 0.1 0.3 0.1 6 2

Weighted Total Biogas Composition



CH4 (%) CO2 (%) O2 (%) H2S (ppm) NH3 (ppm)
At Day 3 54.4 39.9 0.4 169 78
At Day 7 55.9 38.6 0.4 181 80
At Day 14 56.1 38.4 0.4 180 80
At Day 21 56.4 38.1 0.4 179 80
At Day 28 56.6 37.9 0.4 178 80

Feedstock Data

Proximate Analysis of Feedstock

Moisture Total Solids (TS) Volatile Solids (VS) Ash Volatile Matter Fixed Carbon
Dry Mass Basis (% Total Solids)
AV. 57.53 42.47 52.87 4.66
Rep 1 57.53 42.47 53.20 4.33
Rep 2 57.52 42.48 52.54 4.98
SD 0.01 0.01 0.46 0.46
As Received Basis (% Wet Mass)
AV. 21.62 78.38 45.09 33.29 41.44 3.65
Rep 1 21.57 78.43 45.09 33.29 41.70 3.39
Rep 2 21.68 78.32 45.08 33.29 41.18 3.39
SD 0.08 0.08 0.01 0.01 0.36 0.36
Dry Ash-Free Basis(%)
AV. 91.91 8.09
Rep 1 92.48 7.52
Rep 2 91.34 8.66
SD 0.80 0.80

Anaerobic Digestion Parameters of Feedstock



COD
g/kg 		BOD
g/kg 		COD:BOD
Ratio 		BI C/N
Ratio
Dry Matter Basis (Total Solids)
AV. 625 400 1.56 0.64 5.55:1
Rep 1 620 390 1.59 0.63 5.56:1
Rep 2 630 410 1.54 0.65 5.54:1
SD 7 14 0.04 0.01



Click here for information on these AD parameters and here for details on the fertiliser parameters.

Fertiliser Parameters of Feedstock



Ammonia
g/kg 		Phosphorus
g/kg 		P2O5
g/kg 		Potassium
g/kg 		K2O
g/kg 		N:P:K Ratio
Dry Matter Basis (Total Solids)
AV. 1.50 10.65 24.39 39.65 47.58 2.38-1.00-1.95
Rep 1 1.00 10.50 24.05 39.10 46.92  
Rep 2 2.00 10.80 24.73 40.20 48.24  
SD 0.71 0.21 0.48 0.78 0.93  
As-Received Basis (Fresh Mass)
AV. 1.18 8.35 19.12 31.08 37.29  
Rep 1 0.78 8.23 18.85 30.65 36.78  
Rep 2 1.57 8.23 19.38 31.51 37.81  
SD 0.56 0.16 0.37 0.61 0.73  
Proportion of Ash Content (g/Kg ash)
AV. 25.07 57.42 93.35 112.02  
Rep 1 24.72 56.62 92.06 110.47  
Rep 2 25.43 58.22 94.65 113.58  
SD 0.50 1.13 1.83 2.20  

Ultimate Analysis of Feedstock

Carbon Hydrogen Nitrogen Sulphur Oxygen
Dry Matter Basis (% Dry Matter)
AV. 32.23 4.62 5.81 0.36 14.50
Rep 1 31.96 4.64 5.75 0.40 14.78
Rep 2 32.50 4.61 5.87 0.33 14.22
SD 0.38 0.02 0.08 0.05 0.39
As-Received Basis (% Wet Mass)
AV. 25.26 3.62 4.55 0.28 11.36
Rep 1 25.05 3.64 4.51 0.31 11.58
Rep 2 25.47 3.61 4.60 0.26 11.15
SD 0.30 0.02 0.06 0.04 0.31
Dry Ash-Free Basis (%)
AV. 56.03 8.04 10.10 0.63 25.20
Rep 1 55.56 8.06 10.00 0.69 25.68
Rep 2 56.50 8.01 10.20 0.57 24.72
SD 0.66 0.04 0.14 0.08 0.68

Stoichiometric Methane Potential (SMP) and Biodegradability Index (BI) of Feedstock

  Biogas
(ml/g) 		Methane
(ml/g) 		CO2
(ml/g) 		% CH4
Volatile Solids Basis (ml per g VS)
Calculated from Buswell Eqn 1,045 596 449 57.0
Actual Value at Day 28 634 359   61.9
BI (%)60.6 60.2   
Dry Matter Basis (ml per g)
Calculated from Buswell Eqn 601 343 258 57.0
As-Received Basis (ml per g)
Calculated from Buswell Eqn 471 269 202 57.0


Click here for information on how the SMP is calculated.


Note that the yields provided are only the maximum possilbe based on the compositional data, the actual yields of biogas when processing your sample in an AD system are likely to be lower.

Heating Values of Feedstock

  HHV
(Measured) 		LHV
(Measured)
Dry Matter Basis (MJ/kg)
Average 14.7353 13.7379
Rep 1 14.7691 13.7717
Rep 2 14.7014 13.7041
Std. Dev. 0.0478 0.0478
As-Received Basis (MJ/kg)
Average 11.5493 10.2394
Rep 1 11.5758 10.2659
Rep 2 11.5228 10.2129
Std. Dev. 0.0375 0.0375
Dry Ash-Free Basis (MJ/kg)
Average 25.6150 23.8812
Rep 1 25.6737 23.9399
Rep 2 25.5562 23.8224
Std. Dev. 0.0831 0.0831

Predicted Biofuel Yields for Feedstock

Tech. 6 7
Total 		7
Diesel 		7
Naptha
Litres
per
tonne 		318 126 98 28
GJ
per
tonne 		6.70 4.26 3.39 0.87


Click here for information on these different representative technologies.


Note that the yields provided are only calculated estimates, the actual yields of biofuel when processing your sample in such processes may differ.

Digestate Data

Proximate Analysis of Digestate

Moisture Total Solids (TS) Volatile Solids (VS) Ash
Dry Mass Basis (% Total Solids)
AV. 28.22 71.78
Rep 1 28.19 71.81
Rep 2 28.25 71.75
SD 0.04 0.04
As Received Basis (% Wet Mass)
AV. 98.81 1.19 0.34 0.85
Rep 1 98.70 1.30 0.34 0.85
Rep 2 98.91 1.09 0.34 0.85
SD 0.15 0.15 0.00 0.00

AD Parameters of Digestate



COD
g/kg 		BOD
g/kg 		COD:BOD
Ratio 		BI C/N
Ratio
Dry Matter Basis (Total Solids)
AV. 162 54 3.00 0.33 6.48:1
Rep 1 158 50 3.16 0.32 6.50:1
Rep 2 166 58 2.86 0.35 1.00:1
SD 6 6 0.21 0.02



Click here for information on these AD parameters and here for details on the fertiliser parameters.

Fertiliser Parameters



Ammonia
g/kg 		Phosphorus
g/kg 		P2O5
g/kg 		Potassium
g/kg 		K2O
g/kg 		N:P:K Ratio
Dry Matter Basis (Total Solids)
AV. 6.00 24.50 56.11 91.35 109.62 1.00-2.82-5.51
Rep 1 5.00 23.00 52.67 91.20 109.44  
Rep 2 7.00 26.00 59.54 91.50 109.80  
SD 1.41 2.12 4.86 0.21 0.25  
As-Received Basis (Fresh Mass)
AV. 0.07 0.29 0.67 1.09 1.30  
Rep 1 0.06 0.27 0.63 1.09 1.30  
Rep 2 0.08 0.27 0.71 1.09 1.31  
SD 0.01 0.03 0.06 0.00 0.01  
Proportion of Ash Content (g/Kg ash)
AV. 34.13 78.17 127.26 152.72  
Rep 1 32.04 73.38 127.05 152.47  
Rep 2 36.22 82.95 127.47 152.97  
SD 2.96 6.77 0.30 0.35  

Ultimate Analysis of Digestate

Carbon Hydrogen Nitrogen Sulphur Oxygen
Dry Matter Basis (% Dry Matter)
AV. 12.90 2.51 1.99 0.50 10.33
Rep 1 12.87 2.45 1.98 0.48 10.44
Rep 2 12.92 2.57 2.00 0.52 10.21
SD 0.04 0.08 0.01 0.03 0.16
As-Received Basis (% Wet Mass)
AV. 0.15 0.03 0.02 0.01 0.12
Rep 1 0.15 0.03 0.02 0.01 0.12
Rep 2 0.15 0.03 0.02 0.01 0.12
SD 0.00 0.00 0.00 0.00 0.00
Dry Ash-Free Basis (%)
AV. 45.71 8.89 7.05 1.77 36.61
Rep 1 45.61 8.68 7.02 1.70 37.00
Rep 2 45.78 9.11 7.09 1.84 36.18
SD 0.13 0.30 0.05 0.10 0.58

Stoichiometric Methane Potential (SMP) of Digestate

  Biogas
(ml/g) 		Methane
(ml/g) 		CO2
(ml/g) 		% CH4
Volatile Solids Basis (ml per g VS) 853 500 353 58.6
Dry Matter Basis (ml per g) 241 141 100 58.6
As-Received Basis (ml per g) 3 2 1 58.6


Click here for information on how the SMP is calculated.


Note that the yields provided are only the maximum possilbe based on the compositional data, the actual yields of biogas when processing your sample in an AD system are likely to be lower.

Efficiency of Digestion

  Feedstock Digestate % Reduction
COD (g/kg dry matter) 625 162 74.1
BOD (g/kg dry matter) 400 54 86.5


Click here for information on COD and here for information on BOD.

      

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