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Today's Topics:
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 <piol...@archivale.com>
To: For Discussion of Anaerobic Digestion
<digestion@lists.bioenergylists.org>
Subject: Re: [Digestion] Inoculation for Small Digesters
Message-ID: <4ca2a82a.1060...@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
a...@sistemabiobolsa.com <mailto:a...@sistemabiobolsa.com>
alexanderb.ea...@gmail.com <mailto:alexanderb.ea...@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 <ericish...@yahoo.com>
To: For Discussion of Anaerobic Digestion
<digestion@lists.bioenergylists.org>
Subject: Re: [Digestion] Costs of different household biodigesters
Message-ID: <6976.126...@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 $50
subsidy. Their
digester model is based on the Chinese dome digester.
Cheers,
Eric
________________________________
From: Alexander Eaton <a...@sistemabiobolsa.com>
To: For Discussion of Anaerobic Digestion <digestion@lists.bioenergylists.org
>
Sent: Wed, September 29, 2010 7:48:18 AM
Subject: Re: [Digestion] Costs of different household biodigesters
HI All,
We have reinforced polyethylene geomembrane digester in a variety of
sizes that
come as a "kit" with all connections, biogas reservoir, geo-textil
ground liner,
gas management systems with high pressure relief valve and filter,
and simpler
burner. The system can be installed in the ground or above ground,
and the
material has a 20 year guarantee. We service and guarantee the
systems for two
years, and offer low cost service for the life of the system
(currently only in
Mexico). There may be additional costs associated with a roof or
greenhouse
structure for the digester. Note that Jaime has also included the
price of a
greenhouse cover for the Bolivia systems, which many others leave
out. Our
intention is no use of concrete, but sometimes there is a bit of
work needed to
make the pig-pen or stable drain adequately to the digester. Retail
prices (all
in) are below, and the sizes refer to m3. We have made systems of 1
and 2 m3
for test purposes, but these are not much less expensive than that
of 4 meters
as the entrance and exits cost the same and our asembly labor is
nearly the same
as well (therefore larger systems are less expensive per m3). From
these prices
we offer discounts for good programs, low income families, and for
higher
quantities purchased.
Bolsa Sizes Costo (MXN) Costo (US$)
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 <tallerbio...@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: ivo...@gmail.com
To: digestion@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
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--
Alexander Eaton
Sistema Biobolsa
IRRI-Mexico
Mex cel: (55) 11522786
US cel: 970 275 4505
a...@sistemabiobolsa.com
alexanderb.ea...@gmail.com
sistemabiobolsa.com
www.irrimexico.org
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