[Stoves] Characteristics of biochar was Re: [biochar] grassifier & cedar chip char

[Crispin Pemberton-Pigott]

Dear Tom

 

Thanks for that:

 

http://www.bacatec.de/dl/Ge09_Glaser-Steiner_engl.pdf

 

"A further criterion for the quality of biochar is the lack of contamination
with both inorganic

(e.g. heavy metals) and organic contaminants (e.g. polycyclic aromatic
hydrocarbons (PAH),

dioxins etc.). In this study, we could only evaluate polycyclic aromatic
hydrocarbons (PAH,

Fig. 4). Although chars from wood gasification are within the elemental
composition and the

black carbon thresholds, they exhibit extremely high PAH contents (Fig. 4).
Therefore, they

are not suited for soil amendment and thus, they cannot be classified as
biochar. Surprisingly

high PAH contents were also measured in the barbeque charcoals (Fig. 4)
while all other

investigated chars had low PAH contents (Fig. 4)."

 

Well, there's a kick in the head. Why not? Because of chemicals manufactured
in the process that were not there in the original fuel. That may explain a
lot to some experimenters.

 

Regards

Crispin

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