DIG-L: Fw:Various

["Tom Miles" <tmiles@trmiles.com>]

----- 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.
>
> On the other hand there is the blooming anaerobic wastewater treatment
> market and therefor bussiness, actually the result from the pioneering
> research and development of the UASB concept of the Lettinga group at
> Wageningen Agricultural University since the seventies.
> (I was lucky to be in that kitchen, since I have worked with him in his
> group for four years in the eighties on ammonia-stripping
> and UASB treatment of calf fattening manure).
> New concepts using granular anaerobic sludge were and still are being
> developed (e.g. EGSB-reactor),
> almost exclusively applied in industrial waste water treatment.
> Interest from the Dutch agricultural, public and political sectors is not
> observed, however.
>
> This can mainly be explained by the 'disappointing farm scale digestion in
> the 8-ties' story that still walking around.
> Summarizing: the same as for sewage sludge digestion there can and has to
be
> done a lot of missionary work in these sectors to convince the grown-up
> status
> of AD-technology !  And I am ready to support any good initiative in this
> respect !
>
> Kind regards,
>
> A.H.H.M. (Ton) Schomaker Msc
> Division Water
> Advisory Group Water Resources & Ecology
>
> Haskoning Nederland B.V.
> a company of Royal Haskoning
> P.O. Box 525
> 5201 AM 's-Hertogenbosch
> The Netherlands
> Tel.: +31 (0)73 687 41 86
> Fax:  +31 (0)73 612 07 76
> Mobile: 06 104 107 26
> E-mail: t.schomaker@royalhaskoning.com
> Internet: www.royalhaskoning.com
>
> This message is intended only for use by the addressee.
> It may contain confidential or privileged information.
> If you have received this communication unintentionally,
> please inform us immediately.
>
>
> -----Original Message-----
> From: Effenberger Mathias [mailto:effenberger@tec.agrar.tu-muenchen.de]
> Sent: woensdag 20 maart 2002 12:39
> To: Digestion Email List CREST (E-Mail)
> Subject: RE: DIG-L: Status of list
>
>
>
>
> > ----------
> > From: Effenberger Mathias[SMTP:EFFENBERGER@TEC.AGRAR.TU-MUENCHEN.DE]
> > Sent: Wednesday, March 20, 2002 12:38:35 PM
> > To: Digestion Email List CREST (E-Mail)
> > Subject: RE: DIG-L: Status of list
> > Auto forwarded by a Rule
> >
> Paul,
>
> I do agree as to small scale, rural applications. However, concerning the
> field of agricultural biogas technology it's sometimes quite depressing
that
> in decades there have been few real innovations in common digester
> technology and especially process control. Many farm digesters are still
> either running far below capacity or on the edge of collapse.
>
> Mathias Effenberger
> Bayerische Landesanstalt fuer Landtechnik
> Am Staudengarten 3
> 85354 Freising
> GERMANY
> phone: +49 8161 71-5157
> fax:   +49 8161 71-4363
> email: effenberger@tec.agrar.tu-muenchen.de
>
> > -----Original Message-----
> > From: Paul Harris [mailto:paul.harris@adelaide.edu.au]
> > Sent: Wednesday, March 20, 2002 3:29 AM
> > To: digestionlistserver
> > Subject: Re: DIG-L: Status of list
> >
> >
> > G'day All,
> >
> > In my opinion high rate biomethanisation is useful in "industrial"
> > situations (and provides a nice research challenge) but low
> > tech systems
> > are better suited to rural situations without expert operators.
> >
> > HOOROO
> >
> > OLEL wrote:
> > >
> > > Dear Tom, Len, & the professionals in AD,
> > >
> > > The list really seems to have become quiet.
> > > I thought I should initiate a discussion which could be of
> > some help to the
> > > professionals in this field or at least be lead to some
> > interesting debate.
> >
> > SNIP
> >
> > >
> > > I would like to know the experiences of professionals,
> > experts ,and views of
> > > all of where do they think the high rate biomethanation is heading.
> > >
> > > Some food for thought,
> > > For all of us,
> > > Thanks,
> > >
> > > Avadhut Bapat
> > --
> > Paul Harris
> > Agronomy & Farming Systems
> > Faculty of Sciences
> > Adelaide University, Roseworthy Campus, AUSTRALIA 5371
> > Ph    : +61 8 8303 7880
> > Fax   : +61 8 8303 7979
> > mailto:paul.harris@adelaide.edu.au
> > http://www.roseworthy.adelaide.edu.au/~pharris
> >
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> GASMK.pdf
> http://www.crest.org/articles/static/1/1010424940_7.html
>
> Beginners Tour of Biogas
> http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners
>
> Digestion List Archives:
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>
> Digestion List Moderator:
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> http://www.roseworthy.adelaide.edu.au/~pharris
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> http://www.crest.org/articles/static/1/1010424940_7.html
>
> Beginners Tour of Biogas
> http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners
>
>



Digestion List Archives:
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Digestion List Moderator:
Paul Harris, paul.harris@adelaide.edu.au
http://www.roseworthy.adelaide.edu.au/~pharris
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Other Digestion Events and Information:
http://www.bioenergy2002.org
http://crest.org/discussiongroups/resources/biomass/biogas/BIOGASMK.pdf
http://www.crest.org/articles/static/1/1010424940_7.html

Beginners Tour of Biogas
http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners