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

[Effenberger Mathias <effenberger@tec.agrar.tu-muenchen.de>]

Hello there,

AD is indeed exothermic yet much less so than aerobic digestion; e.g.,
digestion of 1 mol Glucose yields:

aerobic: 890 kJ thermal energy + 1980 kJ in biomass
anaerobic: 2360 kJ in biogas + 312 kJ thermal energy + 198 kJ in biomass

Complete methanisation of lipids is exergonic only if hydrogen partial
pressure ifrom fermentation of long chain fatty acids is s kept low by
suitable hydrogen utilising bacteria.

Mathias Effenberger
Bavarian Research Center of
Agricultural Engineering
Am Staudengarten 3
85354 Freising
GERMANY
phone: +49 8161 71-5157
fax:   +49 8161 71-4363
email: effenberger@tec.agrar.tu-muenchen.de

> -----Original Message-----
> From: Paul Harris [mailto:Paul.Harris@adelaide.edu.au]
> Sent: Monday, July 22, 2002 3:49 AM
> To: Boer, Andre de; digestionlistserver
> Subject: Re: DIG-L: Energy from internal heating of horse manure
> 
> 
> 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 training, so do not quote me on this point).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
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