Organic waste as a biomass resource - Biomass as Energy Source: Resources, Systems and Applications - page 114

Figure 6.4. Self-constructed semi-continuous biogas digester.

Table 6.4. Results from continuous tests of different suitable biogas substrate mixtures.

Estonia Finland Lithuania Sweden

Substrate Brewers' Municipal Cow manure, biodegradable

grains, edible household sewage sludge, kitchen &

fat, biowaste, waste screenings, waste canteen waste

grease trap from spirit

waste distillation,

palm oil

√

Pre-sorting - - -

Testing period [d] 86 120 127 106

Range of organic load [g oDM/liter 0.7-2.1 2.1-4.9 1.26-3.5 1.4-3.5

digester volume and day]
Recirculation of

√

- - -

digestate
Average final oDM 1.11 7.03 5.45 4.07

of digestate
[% of FM]
Average stable 0.9875 0.5026 0.5725 1.2096

methane production
[NL/h]
Average respective 0.12 0.13 0.25 0.19

buffer capacity
(maximum VOA/TAC)
Number of respective 14 39 16 24

trace gases
( > 70% probability)
Average respective 98.2 78.5 71.7 90.9

degree of
degradation [%]
Average respective 200 80 100 74

residence time [d]