[GreenYes] Re: Recycle or landfill sewage sludge--incineration no good!

[Alan Muller <amuller@no.address>]

Yes, but the award to the Green Bay Metropolitan Sewerage District 
was NOT based on the fact that they incinerate sludge in 
multiple-hearth incinerators.

(Typically there is little attention given to the air emissions 
associated with sewage treatment.  And, alas, these facilities aren't 
covered by the "Toxic Release Inventory" reporting program.)

Incineration is generally bad news, and generally the WORST sort of 
incinerator are these "multiple hearth" units.  The reason is 
(getting technical) that they are "countercurrent" devices, meaning 
that the feed materials are gradually heated but the resulting off 
gases never pass through the highest temperature parts of the process 
along with the solids.

So they are usually big polluters unless they have major afterburners 
and other pollution control equipment.

This is no model for what to do, whatever the merits of the rest of 
the Green Bay operations.

Regards,

Alan Muller
Green Delaware

At 08:11 AM 1/5/2007 -0600, Reindl, John wrote:

> Hi Keith ~
>
> What type of sewage sludge? From municipal sewage treatment plants? 
> From a food processing company or dairy farm?
>
> If it is municipal sewage, what is the composition, especially heavy 
> metals and toxics?
>
> BTW, an environmental group has recently ranked municipal sewage 
> treatment systems. They gave  the top honors to a plant here in 
> Wisconsin that burns their sludge. See an article at 
> http://www.greenbaypressgazette.com/apps/pbcs.dll/article?AID=/20070102/GPG0101/701020482/1207
>
> John
> > -----Original Message-----
> > From: GreenYes@no.address [mailto:GreenYes@no.address]On
> > Behalf Of weedeat@no.address
> > Sent: Thursday, January 04, 2007 8:59 PM
> > To: GreenYes
> > Subject: [GreenYes] Recycle or landfill
> >
> > What is the best way to deal with sewage sludge, I would like all yalls
> > thoughts on this matter. Thanks Keith
> >
> > >
>
> >


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