RE: DIG-L: Fw:Various

[Marty Climenhaga <mclimenhaga@macviro.com>]

Hello Paul
I think a big stumbling block also is the regulatory requirements - in 
Cambodia you can build a biodigester with plastic tubing & PVC for less 
than $100 but in North America I think you'd have to make everything with 
explosion-proof components and meet all kinds of standards. (I'm only 
assuming that, I haven't looked into any kind of exemptions but I'm pretty 
sure a plastic bag full of gas wouldn't fly with regulators).
 Are you building your low-cost project to a certain code? Or as a research 
project does it have special requirements?

-----Original Message-----
From:	Paul Harris [SMTP:paul.harris@adelaide.edu.au]
Sent:	Wednesday, March 20, 2002 11:07 PM
To:	digestion@crest.org
Subject:	DIG-L: Fw:Various

G'day All,

As I was having lunch and pondering the first paragraph below (I had not
scanned the rest) as well as another e-mail I replied to this morning I
realised the huge difference between low AD use in Holland, Australia
and USA on one hand and the rapid adoption of low cost digesters in
Vietman, Colombia and Cambodia. I realise this is in part due to scale
and ambient temperatures but I think it is also due to expectations,
attitudes and other driving forces.

I am in fact right now writing a funding proposal to build a "low cost"
digester at the campus piggery to try and encourage adoption.

Comments welcome.

HOOROO
----- Original Message -----
From: "T.Schomaker" <t.schomaker@worldonline.nl>
To: <digestion-owner@crest.org>
Sent: Wednesday, March 20, 2002 7:52 AM
Subject: subscribe


>
> Dear Mathias and Paul,
>
> I agree on both your points of view.
> As an example, untill 1990 approximately 30 farm scale manure digesters
were
> in operation in Holland.
> Due to low energy prices, disappointing biogas yields and moreover higher
> than expected costs for
> maintenance and operation, these digesters all closed down within a few
> years.
> In spite of some new developments in plugfow and CSTR-systems now - a
decade
> later - agricultural biogas technology
> might still be considered as almost dead in Holland.
>
> Strangely enough this is complete different from the situation in
> surrounding countries like Germany and Denmark, where
> agricultural biogas technology still gets increasing interest.
> Besides me many AD-experts in Holland (G. Zeeman, L. van Velsen) have
> carried studies on the feasibility of AD-technology
> for agricultural, aiming in particular at medium to large scale CAD 
plants
> for manure and organic waste based on the Danish CAD-concept.
> With German and Danish digesters as a refence all these studies reveal
> positive results.

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