Environmental Engineering Reference
In-Depth Information
Table 6.3. Results from batch tests of different suitable biogas substrates.
Methane
[Nm
3
(CH
4
)]/
[Nm
3
(CH
4
)]/
content
Region/city
EWC code
[Mg(fresh mass)]
[Mg(oDM)]
[Vol-%]
Kuopio
20 03 01
69.4
286.7
59.6
household waste average
Lapinlahti
19 08 05
16.6-27.6
312.1-575.3
56.8-63.4
waste water sludge
Kuopio
20 03 01
67.1-127.6
210.5-394.1
56.4-61.7
household waste 1
Kuopio biowaste
20 01 08
67.0-71.6
215.9-230.7
67.0-68.8
Kuopio manure mix
20 02 01, 19 12 07,
46.3-46.6
210.4-211.8
65.0-65.4
02 01 06
Kuopio household waste 2
20 03 01
37.4-55.8
117.2-174.8
68.1-76.3
Klaipeda,
19 08 05
28.3-33.3
176.8-207.6
60.4-64.2
waste water sludge
Siauliu, dump waste
20 03 01
15.1
98.3
67.9
Taurage, dump waste
20 03 01
13.4-24.1
90.6-162.6
51.3-58.8
Plunge, dump waste
20 03 01
11.7
57.8
53.0
Klaipeda, dump waste
20 03 01
6.7-9.9
39.1-57.4
52.0-53.0
Kretinge, cow manure
02 01 06
33.0
225.8
57.6
Taurage, dump waste
20 03 01
13.4-24.1
90.6-162.6
51.3-58.8
Plunge, dump waste
20 03 01
11.7
57.8
53.0
Lithuanian mix
02 01 06, 02 07 02,
83.6-86.7
453.7-470.7
64.0-67.7
19 08 05, 19 08 01,
20 01 25
Poland
<
80mm
20 03 01
27.4-49.0
117.6-209.7
49.2-54.9
Poland
<
60mm
20 03 01
22.2-32.7
119.1-174.9
55.7-62.6
Poland 20-80mm 1
20 03 01
19.2-29.8
91.1-141.2
41.7-52.3
Västerås, biowaste
20 01 08
146.3-147.2
562.2-565.7
65.0
Västerås, household waste
20 03 01
66.1-84.6
221.1-283.2
60.6-72.1
Paper pulp 1
0303
3.0-3.4
16.5-18.4
38.0-40.0
Brewers' grains 1
0207
688.4-99.3
420.3-472.3
61.9-67.2
Grease traps waste 1
190809
305.6-323.3
643.2-680.3
68.4-70.0
Edible fat 1
200125
652.0-837.9
652.5-838.6
63.8-71.7
Kitchen & canteen waste 1
200108
197.8-241.3
468.5-571.5
53.9-67.9
Estonian mix 1
02 07, 19 08 09,
253.0-266.6
605.1-637.6
74.7-74.8
20 01 25, 20 01 08
In batch experiments, the essential retention time for the highest possible degradation rate of the
examined substrate is acquired. With semi-continuous experiments, the whole process circle of a
biogas plant is simulated at different retention times and with different substrate mixtures (mono-
and co-fermentation). For collecting information about long-term behavior (e.g. with respect to
accumulation of materials or inhibition effects) continuous tests are required. Figure 6.4 shows
an exemplary laboratory test digester with a volume of 12 liters being operated at mesophilic
conditions and Table 6.4 shows results from such tests being operated at stable conditions without
any inhibition occurring for a continuous period of minimum three months.
With combining the test results presented in Tables 6.2 and 6.3, a basic up scaling to full-
scale applications becomes possible. This allows the development of regional implementation
strategies, which will be shown in section 6.3.4.
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