[Terrapreta] Char made made under pressurized conditions?

[Folke Günther]

A lot of stuff on the structure and porosity of charcoal at different
burning temperatures and times is to be found here:
http://pubs.usgs.gov/sir/2004/5292/

Roughly, it seems as a 24 hours burning time at about 400 degrees gives the
largest porosity. 

I don have any numbers of the effects on flash pyrolysis and similar methods
in this respect

 

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Folke Günther

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224 73 Lund, Sweden

home/office: +46 46 14 14 29

cell:               0709 710306  skype:  folkegun

Homepage:     http://www.holon.se/folke  

blog: http://folkegunther.blogspot.com/

 

> -----Ursprungligt meddelande-----

> Från: terrapreta-bounces at bioenergylists.org [mailto:terrapreta-

> bounces at bioenergylists.org] För Gerald Van Koeverden

> Skickat: den 30 mars 2008 03:31

> Till: Jeff Davis

> Kopia: Terra Preta

> Ämne: Re: [Terrapreta] Char made made under pressurized conditions?

> 

> On the contrary, I think charcoal has a very good chance of absosbing

> ammonia produced in a compost pile, but it has nothing to do with hot

> or cool charcoal.  After all, charcoal is used to filter out the

> ammonia in fish tanks -  months after the charcoal has already

> cooled.  Charcoal doesn't work like a paper filter in a coffee

> machine that merely stops particles bigger than the holes in the

> paper.   It works more like a sponge, or a clay particle.  The static

> negative electrical charges within its pore structure attracts

> cations (positively-charged ions) and holds them electrically like a

> magnet.

> 

> Check out the following abstract.  It turns out that char produced by

> low temperature (400) pyrolysis absorbed more ammonia than that

> produced at higher temperatures.

> 

> http://ci.nii.ac.jp/naid/110004809613/en/

> 

> I proposed this idea some time ago on this list.  If we could get a

> researcher to test it successfully with compost making in general, we

> would be able to change the prejudice against using charcoal in

> making compost.

> 

> Gerrit

> 

> 

> On 29-Mar-08, at 5:21 PM, Jeff Davis wrote:

> 

> > Dear All,

> >

> > I was thinking more on the lines of capturing the lost ammonia gas

> > (etc)

> > from the composting pile. If it would be possible to absorb this in

> > the

> > cooling period of the charcoal. I know it's a close to zero chance.

> >

> >

> > Best regards,

> >

> >

> > Jeff

> >

> >

> >

> >

> >> Either case, I still doubt that N2 as a reasonably inert gas will do

> >> anything - either as a fertilizer or be absorbed into the char.

> >

> >

> > --

> > Jeff Davis

> >

> > Some where 20 miles south of Lake Erie, USA

> >

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> 

> 

> 

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