[Digestion] Nitrogen Emissions from Biogas

[Paul Harris]

G'day Tom et al,

If biogas is 60% methane and about 40% CO2, with traces of water,
ammonia, H2S etc there will not be much N20. I understand (from my
simple engineering knowledge, which does not really extend to
combustion!) that NOX (N2O?) emissions are a result of combustion, as
they require elevated temperatures, so there should be very little from
a digester compared to a power station.

Since a 2000 cow dairy herd will only generate about 140 kW of
electricity anyway it should be WWAAYY in front of a 10MW power station
anyway.

Happy digesting,
HOOROO

Tom Miles wrote:
> 
> We have had an inquiry from a concerned farmer in Washington state (US)
> about the promotion of biogas digesters for dairy use.  His impression is
> that "Such a  dairy waste water and solids treatment system is a prolific
> emitter of N20."
> 
> His question:"Does anyone have any citations for N20 emissions from a 2000
> cow dairy manure digester? How does such a digester compare to say a 100 mw
> coal plant?"
> 
> How can nitrogen emissions from digestors be captures for use in
> agriculture?
> 
> Where can we find answers to these questions?
> 
> Thanks
> 
> Tom Miles
> 
> _______________________________________________
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> Digestion at listserv.repp.org
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