Environmental Engineering Reference
In-Depth Information
13.2
N
2
O and NH
3
emission measurements being taken by AAFC
research group during land application trials for raw liquid dairy manure
and digestate.
Table 13.5
N
2
O and NH
3
emission factors following land application of raw
dairy manure and digestate
Digestate
(fall
application)
Raw manure
(fall
application)
Digestate
(spring
application)
Raw manure
(spring
application)
NH
3
emission
factor (kg NH
3
-N/kg
NH
4
+
-N
applied
)
0.40
0.23
0.25
0.21
N
2
O emission
factor (kg N
2
O-N/kg
N
applied
)
0.035
0.029
0.021
0.025
Source: Data collected by AAFC.
only slightly higher (1.2 times higher) for the field treated with digestate.
However, the NH
3
emission factor was much higher (1.7 times higher) for
the digestate-treated field. In spring 2007, the land application of raw
manure and digestate resulted in only slight differences between the
respective NH
3
and N
2
O emissions factors. For both experiments, most of
the NH
3
volatilization took place within 6 hours of the land application of
the dairy manures, as was observed during a previous field experiment where
dairy slurry was applied in September (Beuning et al., 2008).
The number of studies investigating NH
3
and N
2
O emissions from
digestate are limited and further studies are needed to better understand gas
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