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[GreenYes] Re: Landfill methane recovery data

Hi John,

I am on the Colorado Climate Project, and we are discussing the fact that we
can't find any studies on "life-cycle methane emissions" from landfills.
It seems that everyone keeps citing that 75% gas recovery rate for
best-available-technology, but my understanding is that this number reflects
only a point-in-time recovery rate when all systems are up and running at
peak performance. My understanding is also that that special "point in
time" begins and ends over a short amount of the time that buried organics
are actually off-gassing.

The lack of real data is probably attributable to the fact that no one has
ever covered a landfill from day one and measured the gas generation over

Have y'all in Wisconsin ever done a life-cycle estimate on the percent of
gas that is actually captured?


-----Original Message-----
From: GreenYes@no.address [mailto:GreenYes@no.address] On Behalf
Of Reindl, John
Sent: Thursday, March 01, 2007 1:40 PM
To: Dennis Sauer; GreenYes@no.address
Subject: [GreenYes] Re: Landfill methane recovery data

Hi Dennis ~

I work for a county that owns a landfill and has very up-to-date technology
for gas extraction and energy production, with revenues of over a million
dollars a year.

When we did our food scraps recovery study, this very question came up and
our study's conclusion was that the removal of food would have negligible
impact on gas recovery at the landfill. (We used the EPA LandGEM model.)

On the other hand, removal of food from landfills will cut down on odors and
the attraction of birds, flies and other vectors. And, for waste generators,
it means that materials don't need to be set out frequently for collection
(I set out material only 2-3 times a year).

Best wishes,

John Reindl, Recycling Manager
Dane County, WI

-----Original Message-----
From: GreenYes@no.address [mailto:GreenYes@no.address]On Behalf
Of Dennis Sauer
Sent: Thursday, March 01, 2007 2:16 PM
To: GreenYes@no.address
Subject: [GreenYes] Landfill methane recovery data

Does anyone have recent data or studies relating to the capture rate of
methane from landfills? As we expand our food scrap diversion programs we
have received criticism that we are stealing fuel from a co-generation
facility at our regional landfill. I realize that in dry tomb landfills, any
reduction of methane from removing food scraps is negligible due to the
rapid decomposition of food scraps. This has been answered by critics who
state that the latest landfill and methane recovery technology does capture
methane from food scraps and all of the methane generated by a landfill. I
have read one study that states: despite claims of 70-75% recovery rates,
the actual amount being recovered is more like 20%. Can anyone direct me to
additional information to back up this data?



Dennis Sauer

Compost Specialist compostspecialist@no.address

Central Vermont Solid Waste Management District

137 Barre St, Montpelier, Vermont 05602

802-229-9383 Ext. 303

800-730-9475(Vt only)

802-229-1318 fax


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