permaculture@lists.ibiblio.org
Subject: permaculture
List archive
- From: Claude Genest <genest@together.net>
- To: permaculture@lists.ibiblio.org
- Subject: Re: [permaculture] Heavy metal issues
- Date: Thu, 19 Sep 2002 14:18:38 -0400
I can't recal lif it was John Todd or Gunter Pauli,who spoke of it, but apparently there's progress being made in actually extracting (some) heavy metals from the plants for reuse/resale.....
On Thursday, September 19, 2002, at 11:04 AM, Mark wrote:
At 09:33 AM 9/19/02 -0400, you wrote:
Good day:)
In a message dated 9/18/02 4:35:09 AM, georg@websuxxess.com writes:
<< mushrooms are known to store heavy metals, so if these
are present in the water hyazint growing medium, they will end up on the
consumers plate? >>
Glad you brought this up Georg. I've always wondered about how utilization of
plants that are known to store heavy metals affects compost, food grown from
that compose etc.
Persons who advocate such use often offer little scientific proof. The best
hope is that in the process of breaking these things down somehow the heavy
metals are either converted to a harmless form or are somehow used up.
As you can see I don't have a clue about the actual process:) Frank
This is certainly an interesting topic, I'll try to dredge up my soil pollution class from 10 years ago...
On the topic of plants accumulating heavy metals, they are definitely still present in the plant, the key questions become what form they are in (how bio available they are) and what to do to dispose of the metals. I would guess that in most cases the bio availability is going to be quite high in plants, thats certainly the case with other minerals. As to what to do with them, as un-PC as it sounds the landfill may be the best bet for Pb, Hg, Cd and other metals which have no value for man, beast or plant. Zn, Cu, Cr and other metals that are of value as trace mineral could be safely spread around from areas of over concentration to areas where they could have value.
Another interesting fact is that many of these minerals bind fairly tightly to soils or may be microbially converted to less available forms over time. It may make sense in some situations to simply cover polluted soils with a membrane for a few months/years in order to limit leaching and allow these conversions to take place rather than extracting the metals and moving the problem elsewhere.
_______________________________________________
permaculture mailing list
permaculture@lists.ibiblio.org
http://lists.ibiblio.org/mailman/listinfo/permaculture
Mark P. Ludwig
Poultry Research Lab
University of Wisconsin -Madison
608-262-1730 WK
608-846-7125 HM
_______________________________________________
permaculture mailing list
permaculture@lists.ibiblio.org
http://lists.ibiblio.org/mailman/listinfo/permaculture
-
Re: [permaculture] Water Hyacinth
, (continued)
-
Re: [permaculture] Water Hyacinth,
georg parlow, 09/18/2002
-
Re: [permaculture] Water Hyacinth,
Lawrence F. London, Jr., 09/18/2002
-
[permaculture] Afghanistan redux,
John Schinnerer, 09/19/2002
- Re: [permaculture] Afghanistan redux, Mark, 09/19/2002
-
[permaculture] Green Party,
Claude Genest, 09/19/2002
- Re: [permaculture] Green Party, Mark, 09/19/2002
- Re: [permaculture] Green Party, One of the Markows, 09/20/2002
-
[permaculture] Afghanistan redux,
John Schinnerer, 09/19/2002
-
Re: [permaculture] Water Hyacinth,
Lawrence F. London, Jr., 09/18/2002
- Re: [permaculture] Water Hyacinth, keller, 09/16/2002
-
Re: [permaculture] Water Hyacinth,
FranksFarm, 09/19/2002
-
[permaculture] Heavy metal issues,
Mark, 09/19/2002
-
Re: [permaculture] Heavy metal issues,
Claude Genest, 09/19/2002
-
Re: [permaculture] Heavy metal issues,
John Schinnerer, 09/28/2002
- Re: [permaculture] Heavy metal issues, Rick Valley, 09/28/2002
-
Re: [permaculture] Heavy metal issues,
John Schinnerer, 09/28/2002
-
Re: [permaculture] Heavy metal issues,
Claude Genest, 09/19/2002
-
[permaculture] Heavy metal issues,
Mark, 09/19/2002
-
Re: [permaculture] Water Hyacinth,
georg parlow, 09/18/2002
Archive powered by MHonArc 2.6.24.