[Terrapreta] sewage sludge charcoal

[Folke Günther]

Raw sewage sludge should never, under any circumstances, be used in a
process involving soil that will be used for food production, because of the
high content of heavy metals. 

I agree that the charring might destroy (or spread out?) some of the
otherwise organic noxious stuff, as medicals and the like.

Thus, if you make char of it, you have to put it in abandoned mines or the
like, which implicates a loss of phosphorus.

 

Much better is to use source-separating toilets, add the urine to char,
possibly char the faeces, and then put it in the soil. 

It is the “purification” process that destroys this otherwise excellent
nutrient stuff.

 

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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/

 

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Från: terrapreta-bounces at bioenergylists.org
[mailto:terrapreta-bounces at bioenergylists.org] För Michael Antal
Skickat: den 9 april 2008 00:45
Till: 'Terra Preta'
Ämne: [Terrapreta] sewage sludge charcoal

 

I am pleased and somewhat surprised to report that raw sewage sludge is a
good feedstock for charcoal production.  Details are available on the HNEI
website below.  Regards, Michael.

 

Michael J. Antal, Jr.

Coral Industries Distinguished Professor of Renewable Energy Resources

Hawaii Natural Energy Institute

POST 109, 1680 East-West Rd.

Honolulu, HI 96822

 

phone: 808/956-7267

fax: 808/956-2336

www.hnei.hawaii.edu

 


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