[Digestion] Costs of different household biodigesters
Eric Buysman
ericishier at yahoo.com
Tue Sep 28 21:47:36 CDT 2010
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 Martí 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: Guía de diseño y manual de
>instalación
>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 list
>Digestion at lists.bioenergylists.org
>http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>
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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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