[Digestion] Dark Hydrogen

[Ken Calvert]

Duncan Sori tru!
Google for biological dark hydrogen and you will eliminate all the 
astronomical stuff and hit some paydirt.
Two pathways to biological hydrogen production.   Photosynthesis, the 
'light' stuff,  and anaerobic breakdown of SCVFA's
or short chain volatile fatty acids, usually in the dark.  Dark hydrogen is 
produced in the normal digestion process, but you never see it, because
a different species of bacteria use it to convert carbon dioxide back to 
methane  as a side reaction.  ATB Ken C.


----- Original Message ----- 
From: "Duncan Martin" <duncanjmartin at eircom.net>
To: "Ken Calvert" <renertech at xtra.co.nz>
Sent: Friday, February 29, 2008 12:04 AM
Subject: Re: [Digestion] Concentration of headspaces gases from Acetogenesis


> Hi Ken
>
> You repeat Asim's use of the word "dark". Are you doing so tongue-in cheek 
> or does it mean something to you?
>
> Duncan
>
> PS I guess you might expect *black* coffee to produce dark hydrogen 
> ....... ;-)
>
>
>
> ----- Original Message ----- 
> From: "Ken Calvert" <renertech at xtra.co.nz>
> To: <digestion at listserv.repp.org>
> Sent: Thursday, February 28, 2008 7:37 AM
> Subject: Re: [Digestion] Concentration of headspaces gases from 
> Acetogenesis
>
>
>> Dear Asim et al,
>>                         I cannot give you an answer to dark hydrogen 
>> production from acetogenesis, but I too sure would like to know.  If you 
>> can wade through the attached file, you will see that working with coffee 
>> wastes produces dark hydrogen in our acid ponds. Before we even get near 
>> the digestion stage.  Problem is that it comes off underneath a layer of 
>> mucilage fragments.  This means that we no longer have the synthesis of 
>> methane from H2 and CO2. So, our methane production is down on the 
>> theoretical.   But we don'tnow by how much???.       ,
>>
>> http://www.coffee.20m.com/The%20Renertech%20Biogas%20Process.htm
>>
>>  What we have been able to discern so far is that there is very little 
>> gas evolved in the acidogenesis/acetogenesis stage in our acid ponds, so 
>> in the meantime we have not worried too much. Too many other things to 
>> work on with limited time and funds available. However, If I ever get 
>> back to Vietnam, this question is top of the list to look into.   So, 
>> please keep me in the loop as well.  Ken Calvert.
>>
>> ----- Original Message ----- 
>> From: "Asim Khan" <asimlaeeq at hotmail.com>
>> To: <digestion at listserv.repp.org>
>> Sent: Thursday, February 28, 2008 1:22 AM
>> Subject: [Digestion] Concentration of headspaces gases from 
>> Acetogenesisprocess
>>
>>
>>
>> Dear all,
>> I am working on hydrogen production from dark fermentation of sewage. I 
>> am looking for the composition of headspace gases generated from the 
>> acetogenesis process. All the literature that i have searched give the 
>> composition of biogas generated from methanogenesis process. Nobody talks 
>> about the composition of acetogenesis products. Literature says that its 
>> hydrogen and carbon dioxide. But are there any other trace gases? If yes 
>> what is their percentage?
>>
>> Asim
>> They are not dead , who live in the hearts   , they leave behind.
>> _________________________________________________________________
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>> Beginner's Guide to Biogas
>> http://www.adelaide.edu.au/biogas/
>> http://info.bioenergylists.org
>>
>>
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>> http://www.adelaide.edu.au/biogas/
>> http://info.bioenergylists.org
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