Dropped of in a walking floor container for further process, directly in a biogas plant or AST Add-On process plant
EFFECT FROM GRINDING AND N-STEAMING
ACCUMULATED GAS YIELD FROM TERMOFILE DIGESTION
7
10
17
30
60
Number of days
Cut straw
36
76
131
190
243
m3 CH4 per ton straw (VS)
N-steamed: Cut straw
54
106
170
238
279
m3 CH4 per ton straw (VS)
Extra yield from N-steamning
18-50%
30-40%
39-30%
48-25%
36-15%
Cut straw
36
76
131
190
243
m3 CH4 per ton straw (VS)
Grinded: Cut straw
50
105
188
248
295
m3 CH4 per ton straw (VS)
Extra yield from grinding
18-50%
18-50%
18-50%
18-50%
18-50%
Grinded and N-steamed: Cut straw
75
147
244
310
339
m3 CH4 per ton straw (VS)
Extra yield from N-steamning
18-50%
18-50%
18-50%
18-50%
18-50%
Extra yield from grinding and N-steamning
18-50%
18-50%
18-50%
18-50%
18-50%
Source:
The analysis has been conducted by Senior Researcher Henrik B. Moller at the Aarhus University Biogas Plant in Foulum, Denmark. The results show that grinding the cut straw will provide the same amount of methane gas during just 17 days compared to regular cut straw digesting during 30 days. This significantly improves the capacity at any given biogas plant. The combined 30 day effect from both grinding and N-steaming gives an extra methane gas yield of +63%.
