[Digestion] Digestion Digest, Vol 5, Issue 2., large Scale Digester for Municipal Waste (Bernd Haase)

Wed Nov 8 02:00:41 CST 2006

Dear Duncan

I totally agree with you, each working temp having its own advantages and drawbacks, also depending of the local context.
You wrote about your published papers. I would be interested in having a copy please.

Best regards

Olivier LEMAIRE
Ingénieur Projets
Centre de Recherche Propreté
Traitements biologiques et Valorisation agronomique

Zone Portuaire de Limay
291, av. Dreyfous Ducas
78520 LIMAY

Tél : 01 30 98 54 11
Fax : 01 30 98 54 99

-----Message d'origine-----
De : digestion-bounces at listserv.repp.org [mailto:digestion-bounces at listserv.repp.org] De la part de Duncan Martin
Envoyé : samedi 4 novembre 2006 11:40
À : R.A. Ramanujam; digestion at listserv.repp.org
Objet : Re: [Digestion] Digestion Digest, Vol 5, Issue 2.,large Scale Digester for Municipal Waste (Bernd Haase)

Thank you for that background Ramanujam

However, I think it is important to note that dry digestion can be mesophilic - or even psychrophilic. How else do landfills yield biogas, even in cold climates? Large ones do warm up - but often fail to reach thermophilic temps.

It would be more correct to say (and this may be what you meant) that working in the thermophilic regime gives the advantage of a faster process. 
This increases the throughput in a costly plant, so the economics are better.

However, it might be more accurate to say that this is true for the CURRENT forms of the process, which favour large plants of quite high technical complexity. It might not be so for a low-tech plant.

My own researches suggest it is worth investigating much simpler process variants, in which low rates are offset by simpler, cheaper, more reliable equipment. I've posted a list of some published papers (over 20 in all) here before but I can send a copy to anyone interested.

Best regards

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
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----- Original Message -----
From: "R.A. Ramanujam" <rar_envtech at yahoo.com>
To: <digestion at listserv.repp.org>
Sent: Saturday, November 04, 2006 4:51 AM
Subject: Re: [Digestion] Digestion Digest, Vol 5, Issue 2.,large Scale Digester for Municipal Waste (Bernd Haase)

> Dear Bernd
>
>  There is no low tech large scale digester operational in India for 
> municipal solid waste.  There is a plant operating in Chennai city of 
> Tamil Nadu India exclusively for Vegetable market waste. Its capacity 
> is 30 tpd. It is low soilds concentration digester. The maximum gas 
> generation achieved was 1700 cum/d.  It is only a demo plant.  
> Therefore we are working on the system to increse the solids 
> concentration to increase the gas production to 2000 - 2300 cum/d. Dry 
> fermentation processes have not been  implemented in India till now in 
> large scale as that kind proceeses have to be operated only in thermophilic condition.
> The biogas generated have to be utilised partly for heating the 
> digester contents. The available gas for energy generation will get 
> reduced.  The economic viability of the project is not of acceptable level.
>
>  regards
>  Ramanujam
>  Assistant Director, Dept of Environmental Technology  Central Leather 
> Research Institute  Adyar, Chennai 600 020
>  Telefax: +91-44-24450234
>  email: rar_envtech at yahoo.com
>
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 3 Nov 2006 07:34:34 +0100 (CET)
> From: "Bernd Haase"
> Subject: [Digestion] large Scale Digester for Municipal Waste
> To: digestion at listserv.repp.org
> Message-ID:
> <1864.203.189.135.187.1162535674.squirrel at webmail.hs-bremen.de>
> Content-Type: text/plain;charset=iso-8859-1
>
> Hey colleagues,
>
> I'm working on a feasibility study in phnom penh for the anaerobic 
> treatment of municipal waste. I'm wondering if some of you have heared 
> about a low-tech large scale plant that works successfully. I heard 
> rumors that india has plants running, but couldn't find anything in the web.
> Please let me now about dry fermentation plants that use household or 
> marktet waste as substrat.
>
> thanx bernd
>
>
>
>
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