[Digestion] 5000 dairy cow AD system (% capture)

Tue Jan 10 21:27:35 CST 2012

Hi folks,

I think the thing to bear in mind with these pasture based dairy systems
that are typical in South Africa, the percentage capture of manure is only
at milking times which is less than 20% of the day, including capture from
waiting pen the usual practice of having a small feed pad for after milking
in the morning.

Mark

From: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Douglas
Renk
Sent: 11 January 2012 01:58 AM
To: For Discussion of Anaerobic Digestion
Subject: Re: [Digestion] 5000 dairy cow AD system

Hello AD listers,

Viessmann Biogas and Schmack are rolling out their containerized 'plug and
play' modular digester this year. It is now in final testing and orders are
being placed:

http://www.biofermenergy.com/us/category/news/schmack-biogas-and-leading-ger
man-agricultural-research-and-training-center-start-cooperation-on-compact-b
iogas-plants/

I'm not certain what Mr Gould may consider affordable for a 100 cow dairy,
but this unit is robust, automated, and includes all safety and process
controls of a full scale plant.

Regards,

Doug Renk

From: Alexander Eaton <alex at sistemabiobolsa.com>
To: For Discussion of Anaerobic Digestion
<digestion at lists.bioenergylists.org> 
Sent: Tuesday, January 10, 2012 3:30 PM
Subject: Re: [Digestion] 5000 dairy cow AD system

www.sistemabiobolsa.com <http://www.sistemabiobolsa.com/>  

Providing solutions for farms of 100 head (dairy) and 1000 head (swine).
Currently in Latin America, but available for export to US.  

Best, 

A

On Tue, Jan 10, 2012 at 1:21 PM, <jonathan at bmpconsultants.com> wrote:

The issue here is that your looking for a commercially available system.
Smaller systems are not commercially manufactured due to business models
proving the larger capital returns from the larger systems.  Their are many
individuals that are "the garage inventors" that have successfully put
together these smaller systems.  Generally these systems have been created
using re-purposed material which has put the capital investment cost down to
near to nothing.   My suggestion would be to get a small team of these
ingenious individuals together and create your own solution.  Once proven,
simply market your solution as it appears to be an available niche market.  

On Tue, Jan 10, 2012 at 11:46 AM, David <david at h4c.org> wrote:

On 1/9/2012 8:34 PM, Gould, Charles wrote: 

Mr. Harris,

I like your suggestion of smaller digesters. The problem is I have not been
able to find a digester design robust enough yet cheap enough for a 100 cow
dairy. Do you know where such a design exists? I have just about given up
the notion that such a thing exists.

This highlights a difficulty which may be partially fundamental (and to that
degree absolute) but which seems largely conceptual, which is that because
situations differ so much, and the need sufficiently moderate that there are
few if any standard "replicable" designs for digesters, of the sort that
would be used for, say, a large block of tract houses, where 1,000 houses
might share four or five basic floor plans. And no doubt specifics in this
area vary country-to-country...

AgSTAR, of the US EPA, which could be said to be the primary
government-based promoter of biogas in the US, is aimed strictly at
manure-using digesters for farms with 500+ animals. For example, although it
could hardly be said to be a digester at a modest scale (cost: $US10M+), the
AgSTAR site deliberately (according to my conversation with a staffer) does
not mention the Stahlbush Island Farms digester in Corvallis, OR, because it
is fed plant matter exclusively-- therefore it is not a manure-based
digester.

It becomes a kind of self-fulfilling prophecy, because the system (in its
academic support, among its industrial implementers and so on), becomes
adapted to larger digesters, and therefore has that much more difficulty
accommodating a different scale of thinking. But as well, it seems that the
variability of energy prices in the US, where feed-in tariffs appear to be a
political impossibility, has prevented the establishment of an industry that
might work its way down to "smaller" digesters, after the larger digesters
on the megafarms have been built, similar to what seems to be happening in
Germany.

I think there may well be a number of lower-cost building and process
control technologies, perhaps along with energy crop co-digestion
strategies, which could be put together in the proper circumstances to
reduce the cost of digesters of a size below the AgSTAR limit in the US; but
it would require a funder with vision to realize such an outcome.

d.

-- 

David William House

"The Complete Biogas Handbook" www.completebiogas.com
<http://www.completebiogas.com/> 
Vahid Biogas, an alternative energy consultancy www.vahidbiogas.com
<http://www.vahidbiogas.com/> 

"Make no search for water.       But find thirst,
And water from the very ground will burst." 

(Rumi, a Persian mystic poet, quoted in Delight of Hearts, p. 77) 

http://bahai.us/

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-- 
Alexander Eaton
Sistema Biobolsa
IRRI-Mexico
RedBioLAC

Mex cel: (55) 11522786
US cel: 970 275 4505

alex at irrimexico.org
alex at sistemabiobolsa.com

sistemabiobolsa.com <http://sistemabiobolsa.com/> 
www.irrimexico.org <http://www.irrimexico.org/> 
www.redbiolac.org <http://www.redbiolac.org/> 

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