ammonia dissociation in water depends on the process temperature and ph value of the
substrate slurry.
Table 1: Nitrogen-content and C/N-ratio data for a selection of substrates, compiled from various sources
Source
Biodegradable material
N in [%]
C/N
Maramba, Felix: Biogas and Waste
Recycling - The Phillipine
Experience; Metro Manila,
Phillipines, 1978, p. 43
A. Animal Dung
1. Hog
2. Carabao
3. Cow
4. Chicken
2.8 13.7
1.6 23.1
1.8 19.9
3.7 9.65
5. Duck
0.8 27.4
6. Pugo
5.0 6.74
Household Wastes
1. Nightsoil
7.1 6.72
2. Kitchen waste 1.9 28.60
C. Crop Residues (air-dry)
1. Corn stalks
1.2
56.6
2. Rice straw
0.7 51.0
3. Corn cobs
1.0 49.9
4. Peanut hulls
1.7 31.0
5. Cogon
1 07 -
6. Bagasse
D. Others
1. Kangkong
0.40
4.3
-
7.8
2. Water lily
2.9 11.4
3. Grass trimmings
2.5
15.7
Barnett, A. et al.: Biogas Technology Night soil
6 6-10
in the Third World; Ottawa, Canada, Cow manure
1.7 18
1978, p. 51
Chicken manure 6.3 7.3
Horse manure
2.3 25
Hay, grass
4 12
Hay, alfalfa
2.8 17
Seaweed
1.9 79
Oat straw
1.1 48
Wheat straw
0.5 150
Bagasse
Sawdust
0.3 150
0.1 200-500
Kaltwasser, Bernd: Biogas;
Wiesbaden, FRG, 1980, pp. 35-36
Night soil
Cow manure
6.0 5.9-10
1.7 16.6-25
Pig manure
3.8 6.2-12.5
Chicken droppings
6.3
5-7.1
Horse manure
2.3 25
Sheep manure
Hay
3.8 33
4.0 12.5-25
Lucernes
2.8 16.6
Algae
1.9 100
Oat straw
1.1 50
Wheat straw
0.5 100-125
Cane trash (bagasse)
Sawdust
0.3
0.1
140
200-500
Cabbage
3.6 12.5
Tomatoes
3.3 12.5
Mustard (runch)
1.5 25
Potato peels
1.5 25
Rice straw
0.6 67
Corn straw
Fallen leaves
0.8 50
1.0 50
Soybean stalks
1.3 33
Peanut shoots
0.6 20
Source: Production and Utilization of Biogas in Rural Areas of Industrialized and Developing Countries, Schriftenreihe der gtz,
No. 97, pp. 71-72
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