[Terrapreta] sewage sludge charcoal

[Tom Miles]

Folke,

 

Understood. Importing feed and concentrating it in animal manure is just an
example of your HEAP process. We see thermal processing  as a means of
putting the nutrients in a form that can be economically transported back
out to where the feed is grown. By fractionating the P (from the K) we can
recycle it either as feed, in place of dicalcium phosphate which is commonly
used, or processed to a fertilizer which can also be transported out of the
area.  

 

Biochar is interesting because it potentially puts the P and K in a form
that doesn’t have to be reprocessed for use as fertilizer. Once the char is
populated with the microorganisms they can do the job. But the biochar would
still have to be transported to the feed producing area. 

 

Tom  

 

From: Folke Günther [mailto:folke at holon.se] 
Sent: Tuesday, April 15, 2008 10:24 AM
To: 'Tom Miles'; terrapreta at bioenergylists.org
Subject: SV: [Terrapreta] sewage sludge charcoal

 

Sorry, but you still have the HEAP trap there if yu don’t spread he ash/char
on the same land as was used to produce the feed to the animals.

 

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Folke Günther

Kollegievägen 19

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/

 

  _____  

Från: Tom Miles [mailto:tmiles at trmiles.com] 
Skickat: den 14 april 2008 06:31
Till: 'Folke Günther'; terrapreta at bioenergylists.org
Ämne: RE: [Terrapreta] sewage sludge charcoal

 

Folke,


Thank you for an excellent description. Since 1990 there has been work in
Japan on charring sewage sludge which so far has not turned up toxic
concentrations of pollutants such as heavy metals in the low temperature
char. 

 

We see the same mechanisms of Phosphorous concentration in the concentrated
animal feed operations, or CAFOS. We developed a method of burning poultry
litter to recover phosphorous-rich ash for feed and potassium-rich ash for
fertilizer. Charring litter may make more sense. So far we have seen no
results from the much advertized poultry  litter pyrolysis projects in
Virginia and elsewhere. 

(eg http://terrapreta.bioenergylists.org/knightpoultry )

 

Tom

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