[Digestion] delivering biogas in cylinders

[Paul Harris]

G'day,

Have you looked at how much energy (biogas) is used to compress 
each  litre of biogas into the cylinder? Now add on the energy to
collect waste to the central plant and then dispose of the spent sludge! 

I know variable volume storage is a nuisance and pipes around the place
are messy, but lets look at the "system" rather than a small part of it.

I see a "distributed" system where waste is basically treated "on site"
and biogas locally utilised via pipes as a simpler and more efficient
way of doing this (I know the total capital cost of digesters is higher,
but the consequence of failure is also greatly reduced!

Happy digesting,
HOOROO

adkarve wrote:
> 
> I am conducting trials on compressing biogas in cylinders and to distribute
> it as cooking energy to householders. The idea is to install a large,
> centrally located biogas plant and to provide householders daily with about
> 500 g of methane in a cylinder. I would not be attempting to liquify methane
> but just to compress it in order to reduce its volume. I was told by an
> energy expert that by not removing the carbon dioxide from the biogas, one
> may be able to accommodate more methane in a cylinder, because methane
> dissolves in liquid carbon dioxide.  Thus, one compresses biogas till the
> carbon dioxide is liquified, and the methane in the mixture automatically
> dissolves in liquid carbon dioxide. I am neither an engineer, nor a
> physicist, but a biologist. Can any members of this group tell me whether
> the above procedure would be better than filling the cylinders with pure
> methane?
> Yours
> A.D.Karve
> 
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-- 
Mr. Paul Harris
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