[Digestion] landfill vs. AD

[Russell Thomas]

Never thought I'd say this, seeing as I've been working in the landfill gas
to energy sector for the last 15 years . . . the collection efficiency on a
landfill won't be as high as in a digester, due to the mix of other non
organic wastes, the leachate levels, the variable natural decomposition in
the site and the overall collection efficiency of the extraction system.

 Overall, you will get a better bang for buck through controlled and
accelerated decomposition, enhancing collection efficiency by digesting it.


-----Original Message-----
From: digestion-bounces at listserv.repp.org
[mailto:digestion-bounces at listserv.repp.org] On Behalf Of Jason Perry
Sent: 27 April 2007 16:55
To: digestion at listserv.repp.org
Subject: [Digestion] landfill vs. AD

Dear AD Listers,

I may have asked this question in some form before, but I thought I'd 
rephrase it.

Consider a rural town in the Northeastern US. If you had a choice 
between 1) sending the town's domestic food waste to a landfill that 
collects its gas and runs a generator, or 2) sending it to a central AD 
that co-digests food waste and dairy manure and runs a generator, which 
do you think is a better use of the food waste in terms of energy 
production? Assume similar transport schemes between the two.

Many thanks,
Jason Perry

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