Re: DIG-L: Energy from internal heating of horse manure

[Paul Harris <Paul.Harris@adelaide.edu.au>]

G'day,

If you do not aerate the heap the digestion will be anaerobic and will
(if the right bacteria happen to be present) produce methane, so you not
only have a greenhouse gas but an explosion hazard as well!

I think AD is exothermic, it is just that we put so much water in the
system that you do not notice it (I am an agricultural engineeer by
training, so do not quote me on this point).

> "Boer, Andre de" wrote:
> 
> I got a projectproposal about energy from internal heating (Dutch:
> 'broei') in horsemanure. The exploiter wants to collect manure on a
> pile and extract heat from it. Besides many practical questions I have
> some more theoretical questions I would like to ask the list.
> 
> (1). This is digestion, but also is it **anearobic** digestion?
> (2). How much energy can you theoretically extract this way from the
> manure (compared to classic A.D. where you put the manure in a closed
> tank and digest for 15-50 days?)
> 
> (3). Which gasses does a pile of heating manure emit?
> Greenhousegasses??
> (4). Why is internal heating an exothermic process while classic A.D.
> is an endothermic process?
> (5). Has anyone of you ever seen a project like this and where can I
> find more about that project?
> 
> Thanks for replying.
> 
> Andre de Boer
> Novem
> 
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-- 
Paul Harris
Faculty of Sciences
Adelaide University, Roseworthy Campus, AUSTRALIA 5371
Ph    : +61 8 8303 7880
Fax   : +61 8 8303 7979
mailto:paul.harris@adelaide.edu.au
http://www.roseworthy.adelaide.edu.au/~pharris

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