[Digestion] Inoculation
Greg Austin
greg.austin at agama.co.za
Wed Sep 29 01:03:06 CDT 2010
Hi
We have a similar problem here with our small digesters, and typically
use cow manure as a starter. We have also looked into the tablets,
and yes they are enzymes, and really don't do what's required. Sorry
not to be able to offer a solution, but hope someone else can provide
ideas?!
Regards
--
Greg Austin
AGAMA Biogas (Pty) Ltd
T +27 21 7013364
F +27 21 7024920
E greg.austin at agama.co.za
W www.agama.co.za
W www.biogaspro.com
On 29 Sep 2010, at 4:47 AM, digestion-request at lists.bioenergylists.org
wrote:
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> Today's Topics:
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> 1. Re: Inoculation for Small Digesters (Marc de Piolenc)
> 2. Re: Costs of different household biodigesters (Eric Buysman)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 29 Sep 2010 10:44:58 +0800
> From: Marc de Piolenc <piolenc at archivale.com>
> To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Inoculation for Small Digesters
> Message-ID: <4CA2A82A.1060105 at archivale.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> The tablets are probably enzymes, when what you need are the
> microorganisms that produced the enzymes. You may need to produce your
> own packaged inoculant, but if you succeed you may have a marketable
> product. Research is the first step; find out the techniques used in
> microbiological laboratories for culturing and preserving the
> organisms
> you need, then see if they all have a common preservation medium.
>
> Best,
> Marc de Piolenc
> Iligan City, Philippines
>
> Archivale catalog: http://www.archivale.com/catalog
> Polymath weblog: http://www.archivale.com/weblog
> Translation services: http://www.proz.com/profile/639380
> Ducted fans: http://massflow.archivale.com/
>
> On 9/29/2010 1:07 AM, Alexander Eaton wrote:
>> HI All,
>>
>> We have been doing our systems start (for small household scale
>> digesters) with the paunch waste from slaughterhouses, adding 50-100
>> liters of the waste along with manure and water as an initial charge.
>> Transporting this waste (wet, heavy, and a bit nasty) is a bit of a
>> pain. My technicians keeping hinting at better incolculant
>> solutions,
>> and I would like to see if there is anyone out there making really
>> effective inoculates (or knows how to make them) that are dry,
>> simple to
>> apply, but really effective in starting a digester. Efficient and
>> fast
>> start-up is a really crucial aspect of technology adoptions, and
>> using
>> effluent from functioning digesters or the paunch waste has
>> produced the
>> best results for us as far as start-up rates. We have seen a brand
>> of
>> tablets for septic tanks, but we have not found them to improve
>> start-up
>> times as compared with straight manure. Thanks in advance.
>>
>> Saludos,
>>
>> A
>>
>> --
>> Alexander Eaton
>> Sistema Biobolsa
>> IRRI-Mexico
>>
>> Mex cel: (55) 11522786
>> US cel: 970 275 4505
>>
>> alex at sistemabiobolsa.com <mailto:alex at sistemabiobolsa.com>
>> alexanderb.eaton at gmail.com <mailto:alexanderb.eaton at gmail.com>
>> sistemabiobolsa.com <http://sistemabiobolsa.com>
>> www.irrimexico.org <http://www.irrimexico.org>
>>
>>
>>
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>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 28 Sep 2010 19:47:36 -0700 (PDT)
> From: Eric Buysman <ericishier at yahoo.com>
> To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Costs of different household biodigesters
> Message-ID: <6976.126.qm at web33805.mail.mud.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear all,
>
> The investment costs (part paid by the farmer) in Cambodia are as
> follows:
>
> Plant size 4 m3 6 m3 8 m3 10 m3 15 m3
> Estimated cost (USD)* 400 470 550 625 890
> Subsidy (USD) 150 150 150 150 150
>
> The digester model is a modified version of the Deenbandhu
> digester, a fixed
> dome digester. The digester have a 2 year warranty and last
> typically for 15-20
> years.
>
> On top of that users receive a flat rate subsidy of $150, which
> originates from
> carbon finance. The program costs are, I believe, now $250 per
> biogas plants.
> This is a joint SNV- Cambodian government programme.
>
> In Vietnam the costs are almost 1 million VND per m3, that is around
> $50/m3
> digester volume, on top of that farmers receive a flat rate $50
> subsidy. Their
> digester model is based on the Chinese dome digester.
>
> Cheers,
>
> Eric
>
>
>
>
>
> ________________________________
> From: Alexander Eaton <alex at sistemabiobolsa.com>
> To: For Discussion of Anaerobic Digestion <digestion at lists.bioenergylists.org
> >
> Sent: Wed, September 29, 2010 7:48:18 AM
> Subject: Re: [Digestion] Costs of different household biodigesters
>
> HI All,
>
> We have reinforced polyethylene geomembrane digester in a variety of
> sizes that
> come as a "kit" with all connections, biogas reservoir, geo-textil
> ground liner,
> gas management systems with high pressure relief valve and filter,
> and simpler
> burner. The system can be installed in the ground or above ground,
> and the
> material has a 20 year guarantee. We service and guarantee the
> systems for two
> years, and offer low cost service for the life of the system
> (currently only in
> Mexico). There may be additional costs associated with a roof or
> greenhouse
> structure for the digester. Note that Jaime has also included the
> price of a
> greenhouse cover for the Bolivia systems, which many others leave
> out. Our
> intention is no use of concrete, but sometimes there is a bit of
> work needed to
> make the pig-pen or stable drain adequately to the digester. Retail
> prices (all
> in) are below, and the sizes refer to m3. We have made systems of 1
> and 2 m3
> for test purposes, but these are not much less expensive than that
> of 4 meters
> as the entrance and exits cost the same and our asembly labor is
> nearly the same
> as well (therefore larger systems are less expensive per m3). From
> these prices
> we offer discounts for good programs, low income families, and for
> higher
> quantities purchased.
>
>
>
> Bolsa Sizes Costo (MXN) Costo (US$)
> 4 $9,292 $743
> 8 $12,802 $1,024
> 12 $16,312 $1,305
> 16 $19,823 $1,586
> 20 $20,515 $1,641
> 30 $28,813 $2,305
>
> We also built a lot of regular plastic digesters in the style of Jaime
> (Taiwanese or Preston Digester), and the costs in Mexico (same
> components,
> double layer bag), were only about 10-20% lower. This is higher
> than Jaime has
> shown, which could be because of higher material prices in Mexico.
>
>
> For SNV's program in Africa, their prices for the concrete dome
> digesters were
> nearly identical for those I listed above. We are quite a bit
> cheaper overall
> as our system requires only a couple hours (one technician installs
> 3 per day)
> versus a week of construction. Also, our materials prices are much
> cheaper at
> higher volumes.
>
>
> It is important to note that it can be very misleading to state
> "costs" for
> these types of systems. These sorts of speculations often seem to
> project the
> idea that someone is building the system in their backyard, and
> therefore it is
> appropriate to externalize many of the costs. When installing the
> "appropriate
> tech" style bag digester, there are a few days of installation
> preparation, plus
> acquisition of materials, etc. Just pulling off the price tag of
> the materials
> often does not appropriately encapsulate the full cost of the
> installation.
> This tends to set up false expectations to those who would like to
> promote the
> technology, or when a government wants to spend to have them
> installed. I
> beleive (please comment Jaime) that the Bolivia program has a
> subsidy in place
> for installation, transport, and labor, which is crucial to
> consider. The
> families are also required to supply certain materials and labor for
> the
> installation.
>
>
> I also have a full study of Life Cycle Costs, which is arguably a
> better measure
> of the cost of a system that you want to last a long time. With a
> longer
> projected life span (and repairability), geomembrane digesters were
> about 40%
> less expensive over a 10 year span than lower quality plastic
> systems. Dome
> digester tend to hold their value longer in some cases, but there is
> a higher
> abandonment rate due to slow gas leaks that reduce end user
> satisfaction.
>
>
> Saludos,
>
> A
>
>
>
> On Tue, Sep 28, 2010 at 6:03 PM, Jaime Marti Herrero <tallerbiogas at hotmail.com
> >
> wrote:
>
> Hi
>> plugflow digester made of tubular polyethilene cost in Bolivia:
>> -For cold climate : 230 us$ with 6.5m3 of liquid volume, green
>> house, three
>> biogas reservoirs, and one bunner
>> -For valley climate: 185 us$ with 3,5m3 of liquid volume, 66% sun
>> cover, two
>> biogas reservoirs and one bunner
>> -For tropical climate 168 us$ witk 3 m3 of liquid volume, 66% sun
>> cover, two
>> biogas reservoirs and one bunner
>> all of are load with 20kg of fresh cow manure and 60 liters of
>> water per day,
>> producing about 700 liters of biogas per day.
>>
>> We have done 1m3 tubular polyethilene digester for research
>> considerations using
>> 2m circunference plastic and 4,8 meters long. i dont have the cost
>> because a
>> plastic factory donate this material to our laboratory.
>>
>> i hope this helps
>> keep in touch
>> jaime
>> -----
>> Jaime Mart? Herrero
>>
>>
>> Technical advisor of biogas for the GTZ-Bolivia
>> CIMNE (www.cimne.com)
>> Building Energy and Environment Group
>> International research cooperation area
>> La Paz ? Bolivia
>> Tel. (+591)-73 090 621
>>
>>
>> BIOGAS AND BOLIVIA
>> -Taller Biogas Bolivia
>> http://tallerbiogas.blogspot.com
>> -Video: Biodigester installation in bolivian Altiplano
>> http://es.youtube.com/watch?v=3Sl0XEN5Bgo
>> http://www.youtube.com/watch?v=Vs0JuV8WD_c
>> -Manual gratuito-Biodigestores familiares: Gu?a de dise?o y manual de
>> instalaci?n
>> http://www.upc.edu/grecdh/pdf/2008_JMH_Guia_biodigestores.pdf
>>
>>
>>
>>
>> ________________________________
> Date: Tue, 28 Sep 2010 10:50:06 -0700
>> From: ivomdb at gmail.com
>>
>> To: digestion at lists.bioenergylists.org
>> Subject: [Digestion] Costs of different household biodigesters
>>
>>
>> Hi all,
>>
>> I would like to know if anyone knows or have a good estimate of the
>> cost of the
>> following small scale biodigesters:
>>
>> 1- Plug-flow polyethylene biodigester type (like the ones in
>> Bolivia) (between
>> 1-10 m3).... I don't know if it's possible to build one with such
>> small size
>> like 1m3
>> 2- Chinese fixed-dome (between 1m3-10 m3)
>> 3- ARTI type biodigester (1-2 m3)
>>
>> Thanks,
>>
>> Ivo Oliveira
>>
>> _______________________________________________ Digestion mailing
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>>
>>
>
>
> --
> Alexander Eaton
> Sistema Biobolsa
> IRRI-Mexico
>
> Mex cel: (55) 11522786
> US cel: 970 275 4505
>
> alex at sistemabiobolsa.com
> alexanderb.eaton at gmail.com
> sistemabiobolsa.com
> www.irrimexico.org
>
>
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