[Digestion] Digester for Municipal Waste (Bernd Haase)

[Paul Harris]

G'day All,

If you only look at an individual unit as the basis of a discussion you
may well end up with that unit working really well, but not fitting in
to the surrounding system.

Biogas should preferably be used directly, as electricity generation is
not efficient (it is a bit better if you can use the waste heat as Art
suggests).

You may get more energy by burning manure then you get from anaerobic
digestion, but then were to the organic fertilisers/nutrients that are
needed for crop growth come from?

We need to keep a wider system in mind, then the slightly reduced
performance of one unit may be balanced by much superior "system"
operation. Not everything has to be high tech, peak efficiency - that
requires a lot of management to maintain.

All the best,
HOOROO

adkarve wrote:
> 
> Through this message I wish to convey that biogas is not always the ideal
> fuel for producing electricity. Methane is a high grade form of fuel. If you
> want to run an internal combustion engine, you may have to convert the
> biomass into methane. But a lot energy is lost in the process of
> biomethanation itself. One kg dry dung would yield 2600 kcal of energy if it
> is burned directly, but converted into methane, it yields only 600 kcal
> energy. Drying dung or any other biomass for direct combustion is not a
> problem in India.One can produce electricity by using a steam turbine, in
> which the steam can be generated by burning any fuel. The sugar industry
> burns bagasse for this purpose. Similarly, municipal solid waste can also be
> burned directly to produce steam and the steam can be used to produce
> electricity.
> Yours
> A.D.Karve
> ----- Original Message -----
> From: Shrinivas Kasulla <na_sh81 at yahoo.co.in>
> To: <digestion at listserv.repp.org>
> Sent: Saturday, November 04, 2006 10:12 PM
> Subject: [Digestion] Fwd: Re: Digestion Digest, Vol 5,Issue 2.,large Scale
> Digester for Municipal Waste (Bernd Haase)
> 
> > Hi,
> > thats true sir ive also read about many articles and i
> > do feel that u are absolutely correct and i do value
> > ur suggestions and as far as Dr. Ramanujam's
> > suggestions and observations of his demo plant is
> > concerned, i have visited that plant and yes they are
> > working on a very good technology and i do feel that
> > such type of plants will b having great demand in the
> > near future.
> >
> > with regards
> > Srinivas Kasulla
> > Project Cordinator
> > Note: forwarded message attached.
> >
> >
> >
> >
> >
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-- 
Mr. Paul Harris
Faculty of Sciences, DP710
The  University of Adelaide, Roseworthy Campus, AUSTRALIA 5371
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