[Digestion] Negative Biogas Press

[Paul Harris]

G'day All,

 

To comment on the "gas" aspect - if you compost the waste you release CO2
anyway (probably more that in AD, as the aerobic process is faster) so why
not use the methane on the way through to CO2? If the process is not kept
aerobic (and it takes a fair amount of energy to achieve aeration!) you are
releasing methane anyway and methane is 23 times worse as a greenhouse gas!

 

I do have reservations about the "European" situation of feeding silage to
digesters (instead of to animals) and importing meat from elsewhere - it
would be interesting to see a system analysis. I am sure subsidies have
skewed the economics and hence the energy balances.

 

I have had correspondence about Clostridium botulinum  previously but I
suspect that, like many things, it is really only a problem when "the
system" (in this case the soil) becomes overloaded - otherwise how has the
human race survived to this point and not been wiped out a long time ago?

 

Happy digesting,

HOOROO

 

Mr. Paul Harris, Room S116b, Waite Main Building Faculty of Sciences, The
University of Adelaide, Waite Campus, PMB 1, Glen Osmond SA 5064 Ph    : +61
8 8303 7880      Fax   : +61 8 8303 4386
<mailto:paul.harris at adelaide.edu.au> mailto:paul.harris at adelaide.edu.au
<http://www.adelaide.edu.au/directory/paul.harris>
http://www.adelaide.edu.au/directory/paul.harris

 

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