[Terrapreta] Fwd: Terra Preta and Ants

[Edward Someus]

Dear Sean, 
 
There is a long list of complex characterization items of carbons for
different preparation and application variations. 
 
BET = determination method for specific surface area m2/g by nitrogen
adsorption when active sites are prepared. 
High BET = usually high adsorption capacity, but this may be highly
depending on  lot of other factors as well. 
   
 
 

Sincerely yours: Edward Someus (environmental engineer)
Terra Humana Clean Tech Ltd. (ISO 9001/ISO 14001)
3R Environmental Technologies Ltd. 
ADDRESS: H-1222 Budapest, Szechenyi 59, Hungary
TEL handy:  +(36-20) 201 7557
TEL / FAX:   +(36-1) 424 0224
TEL SKYPE phone via computer:  Edward Someus
3R TERRACARBON:   http://www.terrenum.net 
3R CLEANCOAL ENERGY: http://www.nvirocleantech.com 
 
-------Original Message-------
 
From: Sean K. Barry
Date: 2007.12.15. 6:31:02
To: Edward Someus;  Terra Preta;  Gerald Van Koeverden
Subject: Re: [Terrapreta] Fwd: Terra Preta and Ants
 
Hi Edward,
 
You said ... BET 650-1200 m2/g, while TP is mild with specific surface area
BET 25-100 m2/g, ...
 
What does "specific surface area BET" mean?   What primarily effects this
factor in produced charcoal?  (is it temperature?)  Is there any indication
that the size of the individual pores is different, in the samples of BET
650-1200 m2/g vs BET 25-100 m2/g charcoal?  Does this relative "porosity
size" have differing effects on use of the charcoal by soil biota and/or
change the water holding capacity of the char?  Are there other possible
descriptions of or reasons for the differences between "activated charcoal"
vs Terra Preta style (biochar applicable for soil amendments)?   Does not
the temperature affect the "volatile matter" content also, and does this say
anything about the volatile matter content of TP charcoal.  Can mild
specific surface area BET 25-100 m2/g charcoal have low VM%?  Does low VM%
matter in TP use charcoal?
 
Regards,
 
SKB
 
----- Original Message ----- 
From: Edward Someus 
To: Terra Preta ; Gerald Van Koeverden 
Sent: Thursday, December 13, 2007 8:23 PM
Subject: Re: [Terrapreta] Fwd: Terra Preta and Ants


Dear Gerrit 
 
Thanx for this interesting paper. 
 
TECHNICAL NOTICE:
Activated charcoal (from gas mask 300 mesh about 50 micron) is very much
different than TP. 
 
Activated charcoal is an aggressive - powerful absorbent with specific
surface area BET 650-1200 m2/g, while TP is mild with specific surface area
BET 25-100 m2/g, As far as I know CALCON Carbon tried to put in activated
carbon to soil since long time, but was not successful. 
 
 

Sincerely yours: Edward Someus (environmental engineer)
Terra Humana Clean Tech Ltd. (ISO 9001/ISO 14001)
3R Environmental Technologies Ltd. 
ADDRESS: H-1222 Budapest, Szechenyi 59, Hungary
TEL handy:  +(36-20) 201 7557
TEL / FAX:   +(36-1) 424 0224
TEL SKYPE phone via computer:  Edward Someus
3R TERRACARBON:   http://www.terrenum.net 
3R CLEANCOAL ENERGY: http://www.nvirocleantech.com 
 


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