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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Gasan,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks for your reply. I guess I was just interested to learn
more about your findings and whether the benefits of yeast usage are
significant enough to have implications on biodigester design worldwide! I
suppose the answers to the following questions would give a valuable insight:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>1. What are the implications on biodigester design when yeast is
used. (e.g. Is yield per kg of volatile solids improved? Can retention time be
decreased? By how much?)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>2. How much yeast needs to be added to achieve this improvement?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>3. Can a yeast culture that creates these benefits be sustained in
a flow biodigester or is regular addition of new yeast necessary?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Do your or your colleagues’ research holds the answers to any
of the above?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Edward<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> digestion-bounces@lists.bioenergylists.org
[mailto:digestion-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Gasan
Osojnik<br>
<b>Sent:</b> 03 October 2010 10:11<br>
<b>To:</b> digestion@lists.bioenergylists.org<br>
<b>Subject:</b> [Digestion] Inoculation<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>I was involved in the scale-up
process for a brewery, so the numbers are probably not easily accessable. Our
group was constituted of one biochemist, mech. eng., animal science eng., and a
microbiologist, each of us being quite independent. So my short comment
is based on the discussion we had based on the experiments outcome (microbiota
structure, bmp assay, bench batch & continuous pilot tests performed ).
This is also quite recent, so I expect that publications are yet in the making.
What is your primary interest regarding yeast? <br>
<br>
BR, Gasan<o:p></o:p></p>
<div>
<p class=MsoNormal>On 2 October 2010 12:15, <<a
href="mailto:digestion-request@lists.bioenergylists.org">digestion-request@lists.bioenergylists.org</a>>
wrote:<o:p></o:p></p>
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Today's Topics:<br>
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1. Re: Inoculation (Edward Matos)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Sat, 2 Oct 2010 13:15:35 +0300<br>
From: Edward Matos <<a href="mailto:edward.matos@shambatechnologies.com">edward.matos@shambatechnologies.com</a>><br>
To: "'For Discussion of Anaerobic Digestion'"<br>
<<a
href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
Subject: Re: [Digestion] Inoculation<br>
Message-ID: <SNT112-DS22FB76E59CDA29829DF9E7EA6A0@phx.gbl><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Gasan,<br>
<br>
<br>
<br>
Thanks for your insight into your research on how yeast aids biodigestion. Is
there any peer reviewed literature available on this? I would be interested in
seeing some numbers.<br>
<br>
<br>
<br>
Thanks,<br>
<br>
<br>
<br>
Ed<br>
<br>
<br>
<br>
<br>
<br>
From: <a href="mailto:digestion-bounces@lists.bioenergylists.org">digestion-bounces@lists.bioenergylists.org</a>
[mailto:<a href="mailto:digestion-bounces@lists.bioenergylists.org">digestion-bounces@lists.bioenergylists.org</a>]
On Behalf Of Gasan Osojnik<br>
Sent: 02 October 2010 12:52<br>
To: <a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a><br>
Subject: Re: [Digestion] Inoculation<br>
<br>
<br>
<br>
The use of yeast in the production of biomethane is beneficiary, hence this
is a easily biodegradable substrate. However, the high concentration of
nitrogen lowers the biomethane production potential, and a carbon-rich
co-substrate is therefore neccesary to gain optimal biogas yield.<br>
<br>
In our research, yeast hydrolyzed with the use of different techniques showed
lower producztion of biogas than those where viable yeast was used. This
suggests, that yeasts actively contribute to the production. As the yeasts
transform fermentable sugars to ethanol, they probably aid the methanogenic
community with supplying an additional methabolic pathway (that is until they
are themselves degraded in the process).<br>
<br>
Methanogens themselves are not present in the yeast community, so the
acceleration of the start-up procedure must be due to the described effects.<br>
<br>
Regarding the question of existent inoculates, the start-up is much more
efficient, if the inoculate is fresh - do you have any option of transporting
fresh biomass from other operating digestors to your site? The local
methanogenic communities are already adapted to the "environment" and
by taking the inoculant from appropriate digesters, you can choose form
digesters with similar substrates... Here in Slovenia one of the big biogas
farms has made their start-up with the aid of liophilized inoculant they
acquired from US, yet I am anaware of their succesfullness. I mean. the biogas
plant operates sucessfully, but I am unsure, if the inoculant accelerated the
process. If you like, I can ask them for some feedback.<br>
<br>
Baker/brewers yeast are tippically of the same species, Saccharomyces
cerevisiae, the strains can be different.<br>
<br>
BR, Gasan<br>
<br>
<br>
<br>
<br>
<br>
Ilja Gasan OSOJNIK ?RNIVEC<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
National Institute of Chemistry<br>
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SI-1001 Ljubljana<br>
<br>
<br>
<br>
Tel.: (01) 47 60 358<br>
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(01) 47 60 200<br>
<br>
Fax: (01) 47 60 300<br>
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<br>
<br>
<a href="http://www.ki.si/en" target="_blank">www.ki.si/en</a><br>
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Today's Topics:<br>
<br>
1. Re: Costs of different household biodigesters (David)<br>
2. subscribe (Ted Mathews)<br>
3. Re: Costs of different household biodigesters (Alexander Eaton)<br>
4. Re: Inoculation (Alexander Eaton)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Tue, 28 Sep 2010 23:08:18 -0700<br>
From: David <<a href="mailto:david@h4c.org">david@h4c.org</a>><br>
To: Alexander Eaton <<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>><br>
Cc: For Discussion of Anaerobic Digestion<br>
<<a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
Subject: Re: [Digestion] Costs of different household biodigesters<br>
Message-ID: <<a href="mailto:4CA2D7D2.5070505@h4c.org">4CA2D7D2.5070505@h4c.org</a>><br>
Content-Type: text/plain; charset="iso-8859-1";
Format="flowed"<br>
<br>
<br>
Alex,<br>
<br>
On 9/28/2010 8:55 PM, Alexander Eaton wrote:<br>
> Hi david,<br>
><br>
> For whom is the .75 m3 designed? What feedstock or waste stream
makes<br>
> sense at such a small size? I understand that even the arti folks<br>
> found a functional floor at about twice that size.<br>
<br>
It's a pico- or femto-sized digester (or more accurately digester<br>
kit), to be sure. My purpose in making it is to illustrate some<br>
manufacturing/construction techniques for the workshops, and in a<br>
larger context, to make progress on very, very low cost designs. I'll<br>
probably be posting more about this as things advance, but as yet they<br>
are in a very early state, as my message implied.<br>
<br>
I would imagine that most folks would be feeding it kitchen wastes and<br>
similar, and the possibility exists that it could provide much or even<br>
all one's cooking fuel, in the proper circumstances. (That is, if we<br>
assume that a digester using this kit, kept at body temp, can produce<br>
1 vol biogas per vol digester per day, then we come into the range<br>
often quoted for cooking fuel needs for a small family: 0.75 cu m/day.)<br>
<br>
I call it a kit because it needs to be provided with a shelter, etc.,<br>
or to put it another way, it is not a complete digester /system/. Thus<br>
I would also highlight the point you made, that the price I quote does<br>
not include gas collection, nor a stove, etc. and in that regard would<br>
not be directly comparable to some other prices quoted in response to<br>
the Ivo's question.<br>
<br>
<br>
d.<br>
--<br>
David William House<br>
"The Complete Biogas Handbook" |<a
href="http://www.completebiogas.com" target="_blank">www.completebiogas.com</a>
<<a href="http://www.completebiogas.com/" target="_blank">http://www.completebiogas.com/</a>>
|<br>
/Vahid Biogas/, an alternative energy consultancy |<a
href="http://www.vahidbiogas.com" target="_blank">www.vahidbiogas.com</a> <<a
href="http://www.vahidbiogas.com/" target="_blank">http://www.vahidbiogas.com/</a>><br>
<br>
|<br>
"Make no search for water. But find thirst,<br>
And water from the very ground will burst."<br>
(Rumi, a Persian mystic poet, quoted in /Delight of Hearts/, p. 77)<br>
<br>
<a href="http://bahai.us/" target="_blank">http://bahai.us/</a><br>
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------------------------------<br>
<br>
Message: 2<br>
Date: Wed, 29 Sep 2010 07:14:13 -0500<br>
From: "Ted Mathews" <Ted.Mathews@GreenEnergiesUSA.com><br>
To: <<a href="mailto:Digestion@lists.bioenergylists.org">Digestion@lists.bioenergylists.org</a>><br>
Subject: [Digestion] subscribe<br>
Message-ID: <B83F4416C22F034FBDF3C192DADA29CE345C79@rowdy><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Please add me to the new list.<br>
<br>
<br>
<br>
Ted Mathews<br>
<br>
Green Energy Group<br>
<br>
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------------------------------<br>
<br>
Message: 3<br>
Date: Wed, 29 Sep 2010 07:27:51 -0500<br>
From: Alexander Eaton <<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>><br>
To: <a href="mailto:david@h4c.org">david@h4c.org</a>, For Discussion of
Anaerobic Digestion<br>
<<a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
Subject: Re: [Digestion] Costs of different household biodigesters<br>
Message-ID:<br>
<<a
href="mailto:AANLkTinvZjaey1VM4c-rovxggJEg2mbzUc7nGaX3tkk0@mail.gmail.com">AANLkTinvZjaey1VM4c-rovxggJEg2mbzUc7nGaX3tkk0@mail.gmail.com</a>><br>
Content-Type: text/plain; charset=ISO-8859-1<br>
<br>
IrrI has been offering biogas courses for about 5 years, and I have<br>
had students build hundred of small digester models, but I can never<br>
seem to find the balance between an in-class exercise and a system<br>
that would be take home and functional. Sure they make gas and<br>
illustrate the concept, but if it had a longer and more functional use<br>
(urban) they would be that much better. Anymore info on the model and<br>
functional feedstocks at that size we would be really helpful and<br>
would help the educational efforts.<br>
<br>
Cheers<br>
<br>
A<br>
<br>
On 9/29/10, David <<a href="mailto:david@h4c.org">david@h4c.org</a>>
wrote:<br>
><br>
> Alex,<br>
><br>
> On 9/28/2010 8:55 PM, Alexander Eaton wrote:<br>
>> Hi david,<br>
>><br>
>> For whom is the .75 m3 designed? What feedstock or waste stream
makes<br>
>> sense at such a small size? I understand that even the arti
folks<br>
>> found a functional floor at about twice that size.<br>
><br>
> It's a pico- or femto-sized digester (or more accurately digester<br>
> kit), to be sure. My purpose in making it is to illustrate some<br>
> manufacturing/construction techniques for the workshops, and in a<br>
> larger context, to make progress on very, very low cost designs. I'll<br>
> probably be posting more about this as things advance, but as yet they<br>
> are in a very early state, as my message implied.<br>
><br>
> I would imagine that most folks would be feeding it kitchen wastes and<br>
> similar, and the possibility exists that it could provide much or even<br>
> all one's cooking fuel, in the proper circumstances. (That is, if we<br>
> assume that a digester using this kit, kept at body temp, can produce<br>
> 1 vol biogas per vol digester per day, then we come into the range<br>
> often quoted for cooking fuel needs for a small family: 0.75 cu m/day.)<br>
><br>
> I call it a kit because it needs to be provided with a shelter, etc.,<br>
> or to put it another way, it is not a complete digester /system/. Thus<br>
> I would also highlight the point you made, that the price I quote does<br>
> not include gas collection, nor a stove, etc. and in that regard would<br>
> not be directly comparable to some other prices quoted in response to<br>
> the Ivo's question.<br>
><br>
><br>
> d.<br>
> --<br>
> David William House<br>
> "The Complete Biogas Handbook" |<a
href="http://www.completebiogas.com" target="_blank">www.completebiogas.com</a>
<<a href="http://www.completebiogas.com/" target="_blank">http://www.completebiogas.com/</a>>
|<br>
> /Vahid Biogas/, an alternative energy consultancy |<a
href="http://www.vahidbiogas.com" target="_blank">www.vahidbiogas.com</a> <<a
href="http://www.vahidbiogas.com/" target="_blank">http://www.vahidbiogas.com/</a>><br>
><br>
> |<br>
> "Make no search for water. But find thirst,<br>
> And water from the very ground will burst."<br>
> (Rumi, a Persian mystic poet, quoted in /Delight of Hearts/, p. 77)<br>
><br>
> <a href="http://bahai.us/" target="_blank">http://bahai.us/</a><br>
><br>
<br>
--<br>
Sent from my mobile device<br>
<br>
Alexander Eaton<br>
Presidente<br>
Sistema Biobolsa<br>
<br>
Mex cel: (55) 11522786<br>
US cel: 970 275 4505<br>
<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a><br>
<a href="mailto:alexanderb.eaton@gmail.com">alexanderb.eaton@gmail.com</a><br>
<a href="http://sistemabiobolsa.com" target="_blank">sistemabiobolsa.com</a>
<<a href="http://sistemabiobolsa.com/" target="_blank">http://sistemabiobolsa.com/</a>><br>
<a href="http://www.irrimexico.org" target="_blank">www.irrimexico.org</a> <<a
href="http://www.irrimexico.org/" target="_blank">http://www.irrimexico.org/</a>><br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 4<br>
Date: Wed, 29 Sep 2010 07:33:28 -0500<br>
From: Alexander Eaton <<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>><br>
To: For Discussion of Anaerobic Digestion<br>
<<a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
Subject: Re: [Digestion] Inoculation<br>
Message-ID:<br>
<<a
href="mailto:AANLkTind7bEq4Gv7rKf2XM42s_kZqYN4B-BiGnUa733T@mail.gmail.com">AANLkTind7bEq4Gv7rKf2XM42s_kZqYN4B-BiGnUa733T@mail.gmail.com</a>><br>
Content-Type: text/plain; charset=ISO-8859-1<br>
<br>
Jaime has suggested baking/brewing yeast (is there a big difference?).<br>
There must be a way to keep the bacteria alive in the digester<br>
effluent, while also reducing the effluent volume and improving the<br>
portability. Maybe a combination of the two things? This seems like<br>
a useful area of inquiry. I did, however, assume that someone out<br>
there already had this nailed down...anyone else!?<br>
<br>
Saludos,<br>
<br>
A<br>
<br>
On 9/29/10, Greg Austin <<a href="mailto:greg.austin@agama.co.za">greg.austin@agama.co.za</a>>
wrote:<br>
> Hi<br>
><br>
> We have a similar problem here with our small digesters, and typically<br>
> use cow manure as a starter. We have also looked into the tablets,<br>
> and yes they are enzymes, and really don't do what's required. Sorry<br>
> not to be able to offer a solution, but hope someone else can provide<br>
> ideas?!<br>
><br>
> Regards<br>
><br>
> --<br>
><br>
> Greg Austin<br>
> AGAMA Biogas (Pty) Ltd<br>
> T +27 21 7013364<br>
> F +27 21 7024920<br>
> E <a href="mailto:greg.austin@agama.co.za">greg.austin@agama.co.za</a><br>
> W <a href="http://www.agama.co.za" target="_blank">www.agama.co.za</a>
<<a href="http://www.agama.co.za/" target="_blank">http://www.agama.co.za/</a>><br>
> W <a href="http://www.biogaspro.com" target="_blank">www.biogaspro.com</a>
<<a href="http://www.biogaspro.com/" target="_blank">http://www.biogaspro.com/</a>><br>
><br>
> On 29 Sep 2010, at 4:47 AM, <a
href="mailto:digestion-request@lists.bioenergylists.org">digestion-request@lists.bioenergylists.org</a><br>
> wrote:<br>
><br>
>> Send Digestion mailing list submissions to<br>
>> <a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a><br>
>><br>
>> To subscribe or unsubscribe via the World Wide Web, visit<br>
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>><br>
>> or, via email, send a message with subject or body 'help' to<br>
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href="mailto:digestion-request@lists.bioenergylists.org">digestion-request@lists.bioenergylists.org</a><br>
>><br>
>> You can reach the person managing the list at<br>
>> <a
href="mailto:digestion-owner@lists.bioenergylists.org">digestion-owner@lists.bioenergylists.org</a><br>
>><br>
>> When replying, please edit your Subject line so it is more specific<br>
>> than "Re: Contents of Digestion digest..."<br>
>><br>
>><br>
>> Today's Topics:<br>
>><br>
>> 1. Re: Inoculation for Small Digesters (Marc de Piolenc)<br>
>> 2. Re: Costs of different household biodigesters (Eric Buysman)<br>
>><br>
>><br>
>> ----------------------------------------------------------------------<br>
>><br>
>> Message: 1<br>
>> Date: Wed, 29 Sep 2010 10:44:58 +0800<br>
>> From: Marc de Piolenc <<a href="mailto:piolenc@archivale.com">piolenc@archivale.com</a>><br>
>> To: For Discussion of Anaerobic Digestion<br>
>> <<a
href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
>> Subject: Re: [Digestion] Inoculation for Small Digesters<br>
>> Message-ID: <<a href="mailto:4CA2A82A.1060105@archivale.com">4CA2A82A.1060105@archivale.com</a>><br>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed<br>
>><br>
>> The tablets are probably enzymes, when what you need are the<br>
>> microorganisms that produced the enzymes. You may need to produce your<br>
>> own packaged inoculant, but if you succeed you may have a marketable<br>
>> product. Research is the first step; find out the techniques used in<br>
>> microbiological laboratories for culturing and preserving the<br>
>> organisms<br>
>> you need, then see if they all have a common preservation medium.<br>
>><br>
>> Best,<br>
>> Marc de Piolenc<br>
>> Iligan City, Philippines<br>
>><br>
>> Archivale catalog: <a href="http://www.archivale.com/catalog"
target="_blank">http://www.archivale.com/catalog</a><br>
>> Polymath weblog: <a href="http://www.archivale.com/weblog"
target="_blank">http://www.archivale.com/weblog</a><br>
>> Translation services: <a href="http://www.proz.com/profile/639380"
target="_blank">http://www.proz.com/profile/639380</a><br>
>> Ducted fans: <a href="http://massflow.archivale.com/" target="_blank">http://massflow.archivale.com/</a><br>
>><br>
>> On 9/29/2010 1:07 AM, Alexander Eaton wrote:<br>
>>> HI All,<br>
>>><br>
>>> We have been doing our systems start (for small household scale<br>
>>> digesters) with the paunch waste from slaughterhouses, adding
50-100<br>
>>> liters of the waste along with manure and water as an initial
charge.<br>
>>> Transporting this waste (wet, heavy, and a bit nasty) is a bit of
a<br>
>>> pain. My technicians keeping hinting at better incolculant<br>
>>> solutions,<br>
>>> and I would like to see if there is anyone out there making really<br>
>>> effective inoculates (or knows how to make them) that are dry,<br>
>>> simple to<br>
>>> apply, but really effective in starting a digester.
Efficient and<br>
>>> fast<br>
>>> start-up is a really crucial aspect of technology adoptions, and<br>
>>> using<br>
>>> effluent from functioning digesters or the paunch waste has<br>
>>> produced the<br>
>>> best results for us as far as start-up rates. We have seen a
brand<br>
>>> of<br>
>>> tablets for septic tanks, but we have not found them to improve<br>
>>> start-up<br>
>>> times as compared with straight manure. Thanks in advance.<br>
>>><br>
>>> Saludos,<br>
>>><br>
>>> A<br>
>>><br>
>>> --<br>
>>> Alexander Eaton<br>
>>> Sistema Biobolsa<br>
>>> IRRI-Mexico<br>
>>><br>
>>> Mex cel: (55) 11522786<br>
>>> US cel: 970 275 4505<br>
>>><br>
>>> <a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>
<mailto:<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>><br>
>>> <a href="mailto:alexanderb.eaton@gmail.com">alexanderb.eaton@gmail.com</a>
<mailto:<a href="mailto:alexanderb.eaton@gmail.com">alexanderb.eaton@gmail.com</a>><br>
>>> <a href="http://sistemabiobolsa.com" target="_blank">sistemabiobolsa.com</a>
<<a href="http://sistemabiobolsa.com/" target="_blank">http://sistemabiobolsa.com/</a>>
<<a href="http://sistemabiobolsa.com" target="_blank">http://sistemabiobolsa.com</a>
<<a href="http://sistemabiobolsa.com/" target="_blank">http://sistemabiobolsa.com/</a>>
><br>
>>> <a href="http://www.irrimexico.org" target="_blank">www.irrimexico.org</a>
<<a href="http://www.irrimexico.org/" target="_blank">http://www.irrimexico.org/</a>>
<<a href="http://www.irrimexico.org" target="_blank">http://www.irrimexico.org</a>
<<a href="http://www.irrimexico.org/" target="_blank">http://www.irrimexico.org/</a>>
><br>
>>><br>
>>><br>
>>><br>
>>> _______________________________________________<br>
>>> Digestion mailing list<br>
>>> <a href="mailto:Digestion@lists.bioenergylists.org">Digestion@lists.bioenergylists.org</a><br>
>>> <a
href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org"
target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
>><br>
>><br>
>><br>
>> ------------------------------<br>
>><br>
>> Message: 2<br>
>> Date: Tue, 28 Sep 2010 19:47:36 -0700 (PDT)<br>
>> From: Eric Buysman <<a href="mailto:ericishier@yahoo.com">ericishier@yahoo.com</a>><br>
>> To: For Discussion of Anaerobic Digestion<br>
>> <<a
href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
>> Subject: Re: [Digestion] Costs of different household biodigesters<br>
>> Message-ID: <<a
href="mailto:6976.126.qm@web33805.mail.mud.yahoo.com">6976.126.qm@web33805.mail.mud.yahoo.com</a>><br>
>> Content-Type: text/plain; charset="iso-8859-1"<br>
>><br>
>> Dear all,<br>
>><br>
>> The investment costs (part paid by the farmer) in Cambodia are as<br>
>> follows:<br>
>><br>
>> Plant size 4 m3 6 m3 8 m3 10 m3 15 m3<br>
>> Estimated cost (USD)* 400 470 550 625 890<br>
>> Subsidy (USD) 150 150 150 150 150<br>
>><br>
>> The digester model is a modified version of the Deenbandhu<br>
>> digester, a fixed<br>
>> dome digester. The digester have a 2 year warranty and last<br>
>> typically for 15-20<br>
>> years.<br>
>><br>
>> On top of that users receive a flat rate subsidy of $150, which<br>
>> originates from<br>
>> carbon finance. The program costs are, I believe, now $250 per<br>
>> biogas plants.<br>
>> This is a joint SNV- Cambodian government programme.<br>
>><br>
>> In Vietnam the costs are almost 1 million VND per m3, that is around<br>
>> $50/m3<br>
>> digester volume, on top of that farmers receive a flat rate $50<br>
>> subsidy. Their<br>
>> digester model is based on the Chinese dome digester.<br>
>><br>
>> Cheers,<br>
>><br>
>> Eric<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> ________________________________<br>
>> From: Alexander Eaton <<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>><br>
>> To: For Discussion of Anaerobic Digestion<br>
>> <<a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a><br>
>> ><br>
>> Sent: Wed, September 29, 2010 7:48:18 AM<br>
>> Subject: Re: [Digestion] Costs of different household biodigesters<br>
>><br>
>> HI All,<br>
>><br>
>> We have reinforced polyethylene geomembrane digester in a variety of<br>
>> sizes that<br>
>> come as a "kit" with all connections, biogas reservoir,
geo-textil<br>
>> ground liner,<br>
>> gas management systems with high pressure relief valve and filter,<br>
>> and simpler<br>
>> burner. The system can be installed in the ground or above
ground,<br>
>> and the<br>
>> material has a 20 year guarantee. We service and guarantee the<br>
>> systems for two<br>
>> years, and offer low cost service for the life of the system<br>
>> (currently only in<br>
>> Mexico). There may be additional costs associated with a roof or<br>
>> greenhouse<br>
>> structure for the digester. Note that Jaime has also included
the<br>
>> price of a<br>
>> greenhouse cover for the Bolivia systems, which many others leave<br>
>> out. Our<br>
>> intention is no use of concrete, but sometimes there is a bit of<br>
>> work needed to<br>
>> make the pig-pen or stable drain adequately to the digester.
Retail<br>
>> prices (all<br>
>> in) are below, and the sizes refer to m3. We have made systems
of 1<br>
>> and 2 m3<br>
>> for test purposes, but these are not much less expensive than that<br>
>> of 4 meters<br>
>> as the entrance and exits cost the same and our asembly labor is<br>
>> nearly the same<br>
>> as well (therefore larger systems are less expensive per m3).
From<br>
>> these prices<br>
>> we offer discounts for good programs, low income families, and for<br>
>> higher<br>
>> quantities purchased.<br>
>><br>
>><br>
>><br>
>> Bolsa Sizes Costo (MXN) Costo (US$)<br>
>> 4 $9,292 $743<br>
>> 8 $12,802 $1,024<br>
>> 12 $16,312 $1,305<br>
>> 16 $19,823 $1,586<br>
>> 20 $20,515 $1,641<br>
>> 30 $28,813 $2,305<br>
>><br>
>> We also built a lot of regular plastic digesters in the style of Jaime<br>
>> (Taiwanese or Preston Digester), and the costs in Mexico (same<br>
>> components,<br>
>> double layer bag), were only about 10-20% lower. This is higher<br>
>> than Jaime has<br>
>> shown, which could be because of higher material prices in Mexico.<br>
>><br>
>><br>
>> For SNV's program in Africa, their prices for the concrete dome<br>
>> digesters were<br>
>> nearly identical for those I listed above. We are quite a bit<br>
>> cheaper overall<br>
>> as our system requires only a couple hours (one technician installs<br>
>> 3 per day)<br>
>> versus a week of construction. Also, our materials prices are
much<br>
>> cheaper at<br>
>> higher volumes.<br>
>><br>
>><br>
>> It is important to note that it can be very misleading to state<br>
>> "costs" for<br>
>> these types of systems. These sorts of speculations often seem
to<br>
>> project the<br>
>> idea that someone is building the system in their backyard, and<br>
>> therefore it is<br>
>> appropriate to externalize many of the costs. When installing
the<br>
>> "appropriate<br>
>> tech" style bag digester, there are a few days of installation<br>
>> preparation, plus<br>
>> acquisition of materials, etc. Just pulling off the price tag of<br>
>> the materials<br>
>> often does not appropriately encapsulate the full cost of the<br>
>> installation.<br>
>> This tends to set up false expectations to those who would like to<br>
>> promote the<br>
>> technology, or when a government wants to spend to have them<br>
>> installed. I<br>
>> beleive (please comment Jaime) that the Bolivia program has a<br>
>> subsidy in place<br>
>> for installation, transport, and labor, which is crucial to<br>
>> consider. The<br>
>> families are also required to supply certain materials and labor for<br>
>> the<br>
>> installation.<br>
>><br>
>><br>
>> I also have a full study of Life Cycle Costs, which is arguably a<br>
>> better measure<br>
>> of the cost of a system that you want to last a long time. With
a<br>
>> longer<br>
>> projected life span (and repairability), geomembrane digesters were<br>
>> about 40%<br>
>> less expensive over a 10 year span than lower quality plastic<br>
>> systems. Dome<br>
>> digester tend to hold their value longer in some cases, but there is<br>
>> a higher<br>
>> abandonment rate due to slow gas leaks that reduce end user<br>
>> satisfaction.<br>
>><br>
>><br>
>> Saludos,<br>
>><br>
>> A<br>
>><br>
>><br>
>><br>
>> On Tue, Sep 28, 2010 at 6:03 PM, Jaime Marti Herrero<br>
>> <<a href="mailto:tallerbiogas@hotmail.com">tallerbiogas@hotmail.com</a><br>
>> ><br>
>> wrote:<br>
>><br>
>> Hi<br>
>>> plugflow digester made of tubular polyethilene cost in Bolivia:<br>
>>> -For cold climate : 230 us$ with 6.5m3 of liquid volume, green<br>
>>> house, three<br>
>>> biogas reservoirs, and one bunner<br>
>>> -For valley climate: 185 us$ with 3,5m3 of liquid volume, 66% sun<br>
>>> cover, two<br>
>>> biogas reservoirs and one bunner<br>
>>> -For tropical climate 168 us$ witk 3 m3 of liquid volume,
66% sun<br>
>>> cover, two<br>
>>> biogas reservoirs and one bunner<br>
>>> all of are load with 20kg of fresh cow manure and 60 liters of<br>
>>> water per day,<br>
>>> producing about 700 liters of biogas per day.<br>
>>><br>
>>> We have done 1m3 tubular polyethilene digester for research<br>
>>> considerations using<br>
>>> 2m circunference plastic and 4,8 meters long. i dont have the cost<br>
>>> because a<br>
>>> plastic factory donate this material to our laboratory.<br>
>>><br>
>>> i hope this helps<br>
>>> keep in touch<br>
>>> jaime<br>
>>> -----<br>
>>> Jaime Mart? Herrero<br>
>>><br>
>>><br>
>>> Technical advisor of biogas for the GTZ-Bolivia<br>
>>> CIMNE (<a href="http://www.cimne.com" target="_blank">www.cimne.com</a>
<<a href="http://www.cimne.com/" target="_blank">http://www.cimne.com/</a>>
)<br>
>>> Building Energy and Environment Group<br>
>>> International research cooperation area<br>
>>> La Paz ? Bolivia<br>
>>> Tel. (+591)-73 090 621<br>
>>><br>
>>><br>
>>> BIOGAS AND BOLIVIA<br>
>>> -Taller Biogas Bolivia<br>
>>> <a href="http://tallerbiogas.blogspot.com" target="_blank">http://tallerbiogas.blogspot.com</a>
<<a href="http://tallerbiogas.blogspot.com/" target="_blank">http://tallerbiogas.blogspot.com/</a>><br>
>>> -Video: Biodigester installation in bolivian Altiplano<br>
>>> <a href="http://es.youtube.com/watch?v=3Sl0XEN5Bgo" target="_blank">http://es.youtube.com/watch?v=3Sl0XEN5Bgo</a><br>
>>> <a href="http://www.youtube.com/watch?v=Vs0JuV8WD_c"
target="_blank">http://www.youtube.com/watch?v=Vs0JuV8WD_c</a><br>
>>> -Manual gratuito-Biodigestores familiares: Gu?a de dise?o y manual
de<br>
>>> instalaci?n<br>
>>> <a
href="http://www.upc.edu/grecdh/pdf/2008_JMH_Guia_biodigestores.pdf"
target="_blank">http://www.upc.edu/grecdh/pdf/2008_JMH_Guia_biodigestores.pdf</a><br>
>>><br>
>>><br>
>>><br>
>>><br>
>>> ________________________________<br>
>> Date: Tue, 28 Sep 2010 10:50:06 -0700<br>
>>> From: <a href="mailto:ivomdb@gmail.com">ivomdb@gmail.com</a><br>
>>><br>
>>> To: <a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a><br>
>>> Subject: [Digestion] Costs of different household biodigesters<br>
>>><br>
>>><br>
>>> Hi all,<br>
>>><br>
>>> I would like to know if anyone knows or have a good estimate of
the<br>
>>> cost of the<br>
>>> following small scale biodigesters:<br>
>>><br>
>>> 1- Plug-flow polyethylene biodigester type (like the ones in<br>
>>> Bolivia) (between<br>
>>> 1-10 m3).... I don't know if it's possible to build one with such<br>
>>> small size<br>
>>> like 1m3<br>
>>> 2- Chinese fixed-dome (between 1m3-10 m3)<br>
>>> 3- ARTI type biodigester (1-2 m3)<br>
>>><br>
>>> Thanks,<br>
>>><br>
>>> Ivo Oliveira<br>
>>><br>
>>> _______________________________________________ Digestion mailing<br>
>>> list<br>
>>> <a href="mailto:Digestion@lists.bioenergylists.org">Digestion@lists.bioenergylists.org</a><br>
>>> <a
href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org"
target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
>>><br>
>>> _______________________________________________<br>
>>> Digestion mailing list<br>
>>> <a href="mailto:Digestion@lists.bioenergylists.org">Digestion@lists.bioenergylists.org</a><br>
>>> <a
href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org"
target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
>>><br>
>>><br>
>>><br>
>><br>
>><br>
>> --<br>
>> Alexander Eaton<br>
>> Sistema Biobolsa<br>
>> IRRI-Mexico<br>
>><br>
>> Mex cel: (55) 11522786<br>
>> US cel: 970 275 4505<br>
>><br>
>> <a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a><br>
>> <a href="mailto:alexanderb.eaton@gmail.com">alexanderb.eaton@gmail.com</a><br>
>> <a href="http://sistemabiobolsa.com" target="_blank">sistemabiobolsa.com</a>
<<a href="http://sistemabiobolsa.com/" target="_blank">http://sistemabiobolsa.com/</a>><br>
>> <a href="http://www.irrimexico.org" target="_blank">www.irrimexico.org</a>
<<a href="http://www.irrimexico.org/" target="_blank">http://www.irrimexico.org/</a>><br>
>><br>
>><br>
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>> ><br>
>><br>
>> ------------------------------<br>
>><br>
>> _______________________________________________<br>
>> Digestion mailing list<br>
>> <a href="mailto:Digestion@lists.bioenergylists.org">Digestion@lists.bioenergylists.org</a><br>
>> <a
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target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
>><br>
>><br>
>> End of Digestion Digest, Vol 1, Issue 17<br>
>> ****************************************<br>
><br>
><br>
<br>
--<br>
Sent from my mobile device<br>
<br>
Alexander Eaton<br>
Presidente<br>
Sistema Biobolsa<br>
<br>
Mex cel: (55) 11522786<br>
US cel: 970 275 4505<br>
<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a><br>
<a href="mailto:alexanderb.eaton@gmail.com">alexanderb.eaton@gmail.com</a><br>
<a href="http://sistemabiobolsa.com" target="_blank">sistemabiobolsa.com</a>
<<a href="http://sistemabiobolsa.com/" target="_blank">http://sistemabiobolsa.com/</a>><br>
<a href="http://www.irrimexico.org" target="_blank">www.irrimexico.org</a> <<a
href="http://www.irrimexico.org/" target="_blank">http://www.irrimexico.org/</a>><br>
<br>
<br>
<br>
------------------------------<br>
<br>
_______________________________________________<br>
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href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org"
target="_blank">http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</a><br>
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End of Digestion Digest, Vol 1, Issue 19<br>
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End of Digestion Digest, Vol 2, Issue 4<br>
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