[Gasification] Cadmium and other heavy metal toxicity

[Max Kennedy]

How about treating the ash by acid/base leaching then concentration from the leachate perhaps through electroplating?  Not necessarily economic but a means of removing the materials from the ash.

Max K


----- Original Message ----
From: Mark Ludlow <mark at ludlow.com>
To: Discussion of biomass pyrolysis and gasification <gasification at listserv.repp.org>
Sent: Thursday, May 10, 2007 11:27:44 PM
Subject: Re: [Gasification] Cadmium and other heavy metal toxicity


Leland,
You make an interesting point when you suggest the use of gasifiers in the
environmental management of toxic metals: "Gasification is an answer to this
problem as the concentration of the toxic compounds in the ash reduces the
volume and weight and makes them approach economic recovery."
This is particularly appealing in the instances of plants engineered or
hybridized to uptake certain heavy metals from contaminated soils. Do you
think that metals could be guaranteed to remain in the ash if the gasifier
were running in a reasonably stable state? Would gasifier exhaust or the
exhaust of attached I.C. engines be clean enough to meet present EPA
standards? Wouldn't there need to be some carbon content?
Best regards,
Mark


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