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

Anand Karve adkarve at gmail.com
Wed Oct 6 16:44:27 PDT 2010


Dear Duncan,
thanks for pointing out the mistake. It should have been 700 to 800 litres.
.Yours Karve

On Wed, Oct 6, 2010 at 3:05 PM, Duncan Martin <duncanjmartin at gmail.com>wrote:

> A typo I think - or has the Law of Conservation of Mass been repealed?
>
> " Using daily 1 kg (dry weight) food waste produces daily about 700 to 800
> kg biogas" !
>
> Maybe 7-800 litres?
>
> Duncan Martin
> Cloughjordan Ecovillage
> Ireland
>
>
>
>   On 4 October 2010 07:47, 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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>
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-- 
***
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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