Environmental Engineering Reference
In-Depth Information
Table 2.1 Characteristics of some biogas feedstocks (* indicates methane
booster)
DM a
(%)
VS b
%of
DM
Type of
feedstock
Organic
content
C:N
ratio
VS
(%)
Methane
yield
(m 3 CH 4 /
kg VS)
Methane
production
(m 3 CH 4 /m 3 )
Animal wastes and by-products
Pig slurry
Carbohydrates,
proteins, lipids
7
5
80.0
4.0
0.30
12.0
Pig manure, solid Carbohydrates,
proteins, lipids
20
80.0
16.0 0.30
48.0
Cattle slurry
Carbohydrates,
proteins, lipids
13
8
80.0
6.4
0.20
12.8
Cattle manure,
solid
Carbohydrates,
proteins, lipids
20
80.0
16.0 0.2
32.0
Poultry droppings Carbohydrates,
proteins, lipids
7
5
80.0
4.0
0.30
12.6
Poultry manure,
solid
Carbohydrates,
proteins, lipids
20
80.0
16.0 0.30
48.0
Stomach/intestine
content, cattle
Carbohydrates,
proteins, lipids
4
12
80
9.6
0.40
38.4
Stomach/intestinal
content, pig
Carbohydrates,
proteins, lipids
4
12
80
9.6
0.46
44.2
Plant wastes and by-products
Straw
Carbohydrates,
lipids
90
70-90 80-90
0.15-0.35
Garden wastes
Carbohydrates,
lipids
125 60-70 90
0.20-0.50
Grass
Carbohydrates,
lipids
18
20-25 90
0.30-55
Fruit wastes
Carbohydrates,
lipids
35
15-20 75
0.25-0.50
Organic wastes from industries
Whey
75-80% lactose,
20-25% protein
— 5
90
4.5
0.33
15.0
Concentrated
whey
75-80% lactose,
20-25% protein
— 10
90
9.0
0.54
31.5
￿ ￿ ￿ ￿ ￿ ￿
Flotation sludge
65-70% proteins,
30-35% lipids
— 5
80
4.0
0.54
21.6
Fermentation slop Carbohydrates
7
1-5
90
0.35-0.78
Whole silage
(grain)
12.6
91
11.5 0.47
53.9
Thin silage (grain)
8.5
86
7.3
0.50
36.5
*Fish oil
30-50% lipids
— 90
90
81.0 0.80
648.0
*Soya oil/
margarine
90%
vegetable oil
— 95
90
85.5 0.80
684.0
*Alcohol
40% alcohol
— 40
95
38.0 0.40
152.0
*Bleach clay
98
40
39.2 0.8
313.6
Olive pulp
— 24
96
23
0.18
41.4
Brewers spent
grains
— 20
90
18
0.33
59.4
*Glycerine
(Continued)
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