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



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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