[Digestion] landfill vs. AD

[Duncan Martin]

Hi Jason

But a similar transport scheme seems highly illogical. Have I read your 
proposal aright?

If the vast majority householders can be persuaded to segregate their 
biowaste efficiently (challenging!) and you set and pay for a separate 
collection system, then an AD plant is a good option. It would be daft to go 
all that trouble then dump it in a landfill - with all the stuff you've kept 
it apart from.

Landfill with LFG collection and use might be preferable (under US law - but 
not in EU) where the biowaste is left in mixed waste or in a residual waste 
fraction.

However, if you had in mind some kind of biowaste AD cell within a landfill 
site, my own research suggests that it would biodegrade much more slowly 
than in a mixed landfill, because rapid acidification would effectively 
ensile it.

Duncan J Martin

Chair
Republic of Ireland Centre
Chartered Institution of Wastes Management

================================
CONTACT DETAILS
Duncan J Martin, PhD, CEng, CSci, MIEI, MCIWM, MIChemE
24 Townsfield, Cloughjordan, N Tipperary, Ireland
Mobile: +353 86 8377 906
Home: +353 505 42087
Email: duncanjmartin at eircom.net
================================






----- Original Message ----- 
From: "Jason Perry" <perry.jason at gmail.com>
To: <digestion at listserv.repp.org>
Sent: Friday, April 27, 2007 4:54 PM
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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