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RE: [GreenYes] Tire Recycling
As noted last time this issue came up on Greenyes:
-There are far more waste tires than can be absorbed by any non-combustion method.
-Use for energy recovery in industrial furnaces (as opposed to lighting them on fire in your back yard) is generally quite clean, especially for any industrial facility employing standard air pollution control equipment.
-The heat of the combustion chamber, and the relatively long residence times, generally breaks down most of the organics.
-Inorganics (such as metals) are generally entrained in the cement when tires are used in cement kilns.  As such they are not in the general environment to bioaccumulate.  In other processes where there is standard ash, metals could be a problem  - though this is also true with the combustion of coal.  I'm not sure of the relative metals contents of the fuels.

I would encourage Muna to identify whether there are plants recovering energy from waste tires in Africa that would meet his standards in terms of low emissions.  If anybody has information on emissions from poorly controlled cement kiln, that would also probably be of relevance since plants in the developing world often have older equipment and lower maintenance budgets.

-Doug Koplow

_______________________________
Doug Koplow
Earth Track, Inc.
2067 Massachusetts Avenue - 4th Floor
Cambridge, MA  02140
www.earthtrack.net
Tel:  617/661-4700
Fax: 617/354-0463



>>> "jholt" <jholt@imagemicro.com> 12/10/02 10:19AM >>>
From what the research I've done, I've found that the tires burn hotter than
conventional heating methods, and therefore cleaner.  The emissions here are
actually cleaner than they would be if they were just using coal.

-----Original Message-----
From: owner-greenyes@grrn.org [mailto:owner-greenyes@grrn.org]On Behalf
Of muna@iafrica.com 
Sent: Tuesday, December 10, 2002 6:50 AM
To: Peter Anderson
Cc: greenyes@grrn.org 
Subject: Re: [GreenYes] Tire Recycling


Hi all!

I would appreciate information on suppliers of technology that allows one to
re-use
tires (we spell them tyres here!), as we think that they may be useful for
buidling
roads and playgrounds....

also:

On 6 Dec 2002 at 11:41, Peter Anderson wrote:
 Companies that reuse old
> tires include utilities, which burn them to make electricity, and
> cement manufacturers, which bake them in kilns with other ingredients
> to produce Portland cement.

this is frightening- the emissions that this produces are extremely toxic,
so please, all,
do not support this method of disposal - the impacts are bio-accumulative,
and
extremely harmful....

regards

Muna
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