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

[Alex English]

Tom,
  http://www.bacatec.de/dl/Ge09_Glaser-Steiner_engl.pdf
shows a separate, data set, for Pyreg char. All at 550C all near zero PAH.
Seems odd to label the bad numbers with such a loaded alias,..... 
unless.....

Alex



On 09/02/2013 8:29 PM, Tom Miles wrote:
>
> Alex,
>
> I haven't seen any complete TLUD char analyses. The Glaser groups 
> seems to be making their gasification char in the Pyreg gasifier.
>
> Tom
>
> *From:*Stoves [mailto:stoves-bounces at lists.bioenergylists.org] *On 
> Behalf Of *Alex English
> *Sent:* Saturday, February 09, 2013 4:41 PM
> *To:* Discussion of biomass cooking stoves
> *Subject:* Re: [Stoves] Characteristics of biochar was Re: [biochar] 
> grassifier & cedar chip char
>
> Crispin, Tom,
> http://www.ithaka-journal.net/certificate/european-biochar-certificate-v4.2-final2012.pdf
> This document  includes a lengthier discussion of PAHs in char, 
> including how some chars are used to bind them in soils, and that 
> current methods for testing are problematic.
>
> We have test results from chars that could be called ' wood 
> gasification' char at levels below the 4mg/kg limit for 'premium biochar'.
>
> The high PAH levels >1000mg/kg in wood gasification chars mentioned 
> below needs a further explanation of the production method. Wood 
> gasification is to vague.
>
> Are there any PAH tests results for TLUD rice hull chars?
>
> Alex
>
>
>
> On 06/02/2013 2:35 PM, Crispin Pemberton-Pigott wrote:
>
>     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 amendmentand 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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