[Digestion] size and cost of a small domestic biogas plant

Reuben Deumling 9watts at gmail.com
Sun Oct 3 23:57:39 PDT 2010


Thank you for helping to answer my earlier question. Can you translate the
daily quantity of biogas produced in your example into units that are more
familiar (BTUs, Joules, cubic feet...)?

Thanks
Reuben Deumling

On Sun, Oct 3, 2010 at 11:47 PM, Anand Karve <adkarve at gmail.com> wrote:

> Dear Members,
> this question was raised in a recent flurry of messages. Instead of
> repeating them, I  wish to state the following:
>  Using daily 1 kg (dry weight) food waste produces daily about 700 to 800
> kg biogas, which most small families (4 to 5 persons) find quite adequate
> for cooking all their meals. Our biogas plant has a digester of 1000 litres
> and a moving drum type of a gas holder having a capacity of about 750
> litres. The  cost of complete biogas plant is about US$200, if it is
> manufactured according instructions contained in our video which can be
> downloaded from our web site www.arti-india.org by paying us US$10 through
> Pay Pal. The matter was also discussed if yeast had beneficial effect on
> biogas production. Frankly, I do not see why and how yeast should benefit
> the process. Yeast would actually act as a competitor of the methanogens in
> that the sugar that would normally have produced biogas, would be used by
> the yeast in producing alcohol. It is likely that alcohol can act as
> substrate for the methanogens (glycerin, which is an alcohol,  can be used
> by the methanogens as a substrate), but a lot of energy would be wasted in
> this process in comparison to obtaining methane directly from the sugars by
> using the methanogens.
> Yours
> A.D.Karve
> --
> ***
> Dr. A.D. Karve
> President, Appropriate Rural Technology Institute (ARTI)
>
> *Please change my email address in your records to: adkarve at gmail.com *
>
>
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