[Terrapreta] Fwd: Terra Preta and Ants

[Sean K. Barry]

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<mailto:edward at terrenum.net> 
  To: Terra Preta<mailto:terrapreta at bioenergylists.org> ; Gerald Van Koeverden<mailto:vnkvrdn at yahoo.ca> 
  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<http://www.nvirocleantech.com/> 
        <http://www.vertustechnologies.com/>
       
               
       
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