the contribution of biogas plants to nutrient management planning
DESCRIPTION
The contribution of biogas plants to nutrient management planning. Adviser Torkild Birkmose, DAAS, Denmark. Photo: Torben Skøtt, BioPress. Biogas. Biogas rests on tree legs. Energy. Agriculture. Environment. Agricultural advantages. Improved fertilizer value of nitrogen - PowerPoint PPT PresentationTRANSCRIPT
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Dansk LandbrugsrådgivningLandscentret
The contribution of biogas plants to nutrient management planning
Adviser Torkild Birkmose,
DAAS, Denmark
Ph
oto
: T
orb
en
Sk
øtt
, B
ioP
res
s
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Dansk LandbrugsrådgivningLandscentret
Biogas rests on tree legs
Biogas
Energy EnvironmentAgriculture
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Dansk LandbrugsrådgivningLandscentret
Agricultural advantages
• Improved fertilizer value of nitrogen
• Balanced P and K-balance in slurry
• Homogeneous and light fluid
• Full declaration of nutrients
• Free from germs and seeds
• Reduced costs for transportation of slurry
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Dansk LandbrugsrådgivningLandscentret
Environmental advantages
• Reduced nitrate leaching
• Reduced odour problems
• Reduced green house gas emission
• Controlled recycling of organic waste
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Dansk LandbrugsrådgivningLandscentret
Mixing and digesting slurry change the characteristic of the slurry
DM,
%
N-tot,
kg/t
NH4-N,
kg/t
P,
kg/t
K,
kg/t
pH NH4-N, %
Digested slurry
Pig slurry
Cattle slurry
4,8
5,0
7,5
4,4
4,8
3,9
3,5
2,9
2,4
1,0
1,1
0,9
2,3
2,3
3,5
7,6
7,1
6,9
81
74
61
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Dansk LandbrugsrådgivningLandscentret
Fertilizer value
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Dansk LandbrugsrådgivningLandscentret
Ammonia evaporation in spring barley
0
10
20
30
40
50
2002 2003
NH
3-lo
ss, %
of
spre
ad N
H4-
N
Untreated pig slurry Digested pig slurry
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Dansk LandbrugsrådgivningLandscentret
Improved fertilizer effect of nitrogen- trials in winter wheat
0 20 40 60 80 100
Cattle slurry, injected
Pig slurry, injected
Digested slurry, injected
Cattle slurry, trailing hoses
Pig slurry, trailing hoses
Digested slurry, trailing hoses
N-utilization, % (fertilizer equivalent)
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Dansk LandbrugsrådgivningLandscentret
Fertilizer plan for nitrogen for 1 ha grass
250250N-requirement, kg
170170N in slurry, kg total
6040N-utilization, %
10268N- in slurry, utilized, kg
34
17
-
-
Saved, kg
Saved, £
148182Mineral fertilizer
Digested slurryCattle slurryPer hectare
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Dansk LandbrugsrådgivningLandscentret
Digestion reduces risk of spreading diseases
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Dansk LandbrugsrådgivningLandscentret
Digested slurry is low on germs
<5<5<5<5<5
1,300,000140,000690,000
9,000,00062,000
Mar. 18May 13July 15Sept. 9Nov. 11
AfterBeforeDate
Test results from Ribe Biogas,bacteria per ml. slurry (1998)
Lo
g10
ger
ms
per
ml.
slu
rry
Time, weeks
Slurry tank, 6-8°C Mesofile biogas, 35°CThermofile biogas, 53°C
10
6
5
3
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Dansk LandbrugsrådgivningLandscentret
Digestion reduces odour
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Dansk LandbrugsrådgivningLandscentret
Reduction of odour compounds in the biogas reactor
0
1
2
3
4
5
6
7
8
0 5 10 15 20
Days
Odour
units
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Dansk LandbrugsrådgivningLandscentret
Concentration of VFA in slurry
0
200
400
600
800
1000
Iso-butanoicacid
Butanoic acid Iso-valericacid
Valeric acid
mg
per
litr
e s
lurr
y
Untreated slurry Digested slurry
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Dansk LandbrugsrådgivningLandscentret
Carcass chamber for collecting air samples
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Dansk LandbrugsrådgivningLandscentret
Odour concentration in air samples after spreading
0
200
400
600
800
1000
1200
20 minutes 260 minutes
Od
ou
r u
nit
s p
er
m3 o
f air
Untreated slurry Digested slurry