[Digestion] heating the fermenter

[Paul Harris]

G'day All,

Even if the reaction is exothermic I think the high specific heat of
water and the difficulty of fully insulating a digester means that you
will need some heating to operate in the mesophilic range, of course you
could also operate in the psycrophilic range (without a heater) at a
longer retention time and get more biogas.

I understand the tropics are only moving north in the northern
hemisphere, and that helps AD - each degree warmer in Australia means
the town shifts 100 km north (or the tropics come 100 km south).

All the best,
HOOROO

adkarve wrote:
> 
> Dear members,
> I still seek an answer to my question as to whether methnogenesis in a
> biogas plant was an exenergonic reaction or not. The claim made by Mr.
> Hatoum that a biogas plant with a moving dome was open at the top and
> therefore not amenable to being insulated, is not acceptable to me.The top
> of the fermenter is not open, but is covered by the gas holder. The gas
> holder is made of moulded plastic. The plastic as well as the biogas inside
> the gas holder are both poor conductors of heat. Since the fermentation
> takes place inside the fermenter vessel, I feel that it would be meaningful
> to insulate the fermenter vessel.
> Yours
> A.D.Karve
-- 
Mr. Paul Harris
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The  University of Adelaide, Roseworthy Campus, AUSTRALIA 5371
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