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RE: [GreenYes] Fw: QUERY: What to do with used tires? [Q from Bra zil]
With all due respect, gentlemen, you have missed Muna's point:

a simple energy balance
 > will
 > show that
 > > "energy from waste" is simply another way of avoiding the issue in the
 > first place -
 > > that of re-use or avoidance...

Mike and Jay are taking us down a road that answers the questions 'how do 
we get rid of old tires' and 'how do we find the energy to create concrete' 
-- but that road, arguably, leads us away from the more important question: 
'how do we get to sustainability'.

H.




At 11:51 AM 02/28/2002 -0500, Jay Donnaway wrote:
>Exactly, Mike
>
>Burning whole tires in a cement kiln is a much better option than mining
>coal to fuel the kiln.  The Bavarian State Institute for Environmental
>Protection (Germany)agrees, and concluded that the best means of disposing
>of waste tires is to use them to tuel cement kilns.  In order to make good
>cement, kilns much reach 1500 to 1600 degrees Centigrade, which is much
>hotter than required for adequate breakdown of hazardous chemicals.
>Hazwaste incinerators, on the other hand, know that higher temperatures make
>for shorter equipment life, so they are incentivized to burn at the lowest
>temp they can get away with.  This is a great example that sometimes, energy
>recovery from waste is most appropriate.
>
>Jay Donnaway
>
>
>
> > -----Original Message-----
> > From: Mike Morrow [SMTP:mmorrow@together.net]
> > Sent: Thursday, February 28, 2002 9:30 AM
> > To:   muna@iafrica.com; mfurtado@dialb.greenpeace.org; Doug Koplow
> > Cc:   greenyes@grrn.org; zerowaste@grrn.org
> > Subject:      Re: [GreenYes] Fw: QUERY: What to do with used tires? [Q
> > from Brazil]
> >
> > You seem to have missed  the guys point here.  Making cement is a chemical
> > process where "contaminants" are incorporated in the final product.  We
> > have
> > lots of examples here of fly ash and some bottom ash being easily
> > incorporated in cement because of the properties of ash.
> >
> > Seems to me that using tires as part of cements fuel mix is a better
> > option
> > than mining more coal to make the same cement.
> >
> > Mike
> >
> > From: <muna@iafrica.com>
> >
> >
> >
> > > On 26 Feb 2002 at 14:36, Doug Koplow wrote:
> > >
> > > > Hi Marcelo,
> > > >
> > > > Your inquiry regarding tires was posted to the Green Yes Listserve, of
> > > > which I am a member.  I looked at waste tires in relation to work I
> > > > did for the US EPA on hazardous waste combustion in cement kilns some
> > > > years ago.  Based on this work, I concluded that disposal of whole
> > > > waste tires (which are not considered hazardous waste) in cement kilns
> > > > is actually a very good solution.
> > > >
> > > > The extremely high temperatures in the kiln, combined with long
> > > > retention times in the burner, lead to very clean combustion, and
> > > > nearly every region of the world has them.  Combustion in kilns does
> > > > not generate the black smoke that one sees when tires are burned in
> > > > open pits.  The metals found in the waste tires (either through steel
> > > > belts or through additives to improve braking, wear, etc.) are mostly
> > > > entrained in the cement clinker, and generally not released to the
> > > > air.
> > > >
> > > Sorry to say, that I do not agree with Doug - we have found that waste
> > incineration
> > > has no positive spinoffs at all, and simply transfers the problem from
> > solid waste to
> > > mainly air pollution, the creation of highly toxic bottom ash, and the
> > actual loss of the
> > > resource and energy used in its manufacture - a simple energy balance
> > will
> > show that
> > > "energy from waste" is simp├? ěnother way of avoiding the issue in the
> > first place -
> > > that of re-use or avoidance...
> > >
> > > the chemicals that are liberated in burning, as well as the heavy
> > metals,
> > etc. cause a
> > > much more serious problem than the one Marcello is trying to solve - we
> > are very
> > > sensitive here regarding eco-justice, and can say very clearly that the
> > burning of ANY
> > > waste is no solution, especially not for the people in our country... or
> > indeed,
> > > anywhere else...
> > >
> > > regards
> > > Muna
> > >
> >
> > ******************************************
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