Kieth, all,
Keith Addison wrote:
> Can you use cowdung mixed with seawater for biogas? All the minerals, which
> is nice, but too much sodium?
>
>> Date: Sun, 26 Oct 2008 02:49:49 -0700 (PDT)
>> From: essam hussen
>> Subject: bio gas arabian cow farm proects
>>
>> dear sir , can we can sea water to mix it with the cow dung of our biogas
>> projects , if so, tell me till we can to go to the next step
>>
In my previous research I had been able to obtain only one study which
used seawater for a generator, and that was for the digestion of kelp,
macrocystis pyrifera, done by United Aircraft Research Laboratories in 1974:
"The study was interesting; these researchers not only tried
using kelp in a continuous-fed freshwater generator, but in a
seawater generator. The substrate was pure kelp. The seawater
generator was gradually acclimated to increasing concentrations
of seawater, and a stable and successful ecosystem was
established in one of the generators thus converted. Gas
production was in the neighborhood of 530 cubic centimeters per
gram TS added. The freshwater generator averaged about 580 cubic
centimeters per gram TS added." (The Biogas Handbook, p 75-76)
There are a number of other studies which have been done to digest kelp,
including some by David Chenowyth, formerly of the Gas Technology
Institute. Naturally, as it concerns cow dung, such studies would be of
limited use, but I would assume that other researchers interested in the
digestion of kelp or another seaweed have likewise tried using seawater.
Indeed, a search in Google bears that out. Two among a large number of
references:
Mass culture of brackish-water-adapted seaweeds in
sewage-enriched seawater. II: Fermentation for biogas production
(http://www.springerlink.com/content/x577v51780716786/fulltext.pdf?page=1
This is a "free preview" of the article-- first page only--
which is otherwise available for purchase.)
Biological Gasification of Marine Algae
(http://www.abe.ufl.edu/~chyn/download/Publications_DC/Book%20Chapters/1987%20-%20Biological%20Gasification....pdf)
d.
--
David William House
"The Complete Biogas Handbook" |www.completebiogas.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)
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