Re: Dioxin formation

[ttweed@wildrockies.org (Tony Tweedale)]

a lot will depend on the residence time in the dioxin formation T. window.
De novo formation from free chlrone (as HCl, typically) takes some time
(seconds to minutes?--don't really know), so you'd want to know the T &
time profiles of the flue gas as it travels through the system.  Dioxins
are also formed from precursors, presumably much more rapidly.  => Don't
know the activated C capture efficiency for free chlorine.  Presumably it
doesn't capture such ionic (charged) species well, as it's designed to
capture organic molecules...but then it does catch metal Hg
species...hmmnn.  Anyway, and more important (cause dioxin is just one type
of organochlorine created), if the carbon adsorption system is upstream
from where T's cool enough to have formed all the O-Cl's that are going to
form, then a lot more o-cl's are going to come out the stack than if it
downstream.  Ie, the T coming out the carbon unit is what counts, *IF* even
some of the free Cl is passing through.  So maybe that's the critical
parameter to ask about.

did you see the PCB/Hg synnergy for neurological effects fwd I posted yesterday?

Tony Tweedale

Causality is a concept not subject to empirical demonstration. -David Hume
(1711-'76)

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