Dear Anand,
What was the particle size of the char that you added to achieve this
effect? Have you tried different sizes?
Thanks,
Alex
On 21/03/2013 8:53 PM, Anand Karve wrote:
Dear Paul, Ron and others,
I was instrumental in the development of an urban biogas plant, which
does not use cattle dung but uses food waste as feedstock. One kg dry
weight of starch, sugar, cellulose, protein or any other kind of human
food produces about 1 kg biogas. My biogas plant could normally accept
only 1gram (dry weight) food waste per litre capacity of
digester. Our experiments in which the biogas digester was filled
with charcoal made it possible to increase the quantity of food waste
to three grams per litre, with three times as much biogas becoming
available from the same plant. This worked for about three months and
then the higher efficiency was no longer available. It is a common
observation, that a biogas plant works better, if chemical fertilizers
are added to the feedstock. I have been thinking about this and it
appears to me that it was the minerals in the biochar, that were
contributing to this phenomenon. After the organisms in the biogas
plant had consumed the minerals, the higher efficiency was no longer
available.
The same phenomenon might be responsible for the higher yield in
fields provided with biochar.
Yours
A.D.Karve
O
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