[Digestion] (no subject)
igor.skrjanec at gmail.com
Tue Oct 5 04:55:26 PDT 2010
Na 4.10.2010 20:15, Arturo Ávalos je pisal:
> Hello all
> Does someone know something about use ferric chloride to reduce the
> sulfur content in the biogas?
> Thanks for the information
> / /
> Digestion mailing list
> Digestion at lists.bioenergylists.org
Ferric chloride is normally use for a neutralizations of H_2 S. Hydrogen
sulfide is slightly soluble in water and acts as a weak acid
<http://en.wikipedia.org/wiki/Weak_acid>, because of this is harmful for
a CHP unit.
H_2 S is a product of sulfate-reducing bacteria
<http://en.wikipedia.org/wiki/Sulfate-reducing_bacteria> which are also
present in biogas reactor. Sulfate-reducing bacteria
<http://en.wikipedia.org/wiki/Sulfate-reducing_bacteria> use present
sulfats from substrates to oxidize the organic matter.
Hydrogen sulfide reacts with metal ions to form metal sulfides
<http://en.wikipedia.org/wiki/Sulfide> (H_2 S + FeCl_2 ? FeS + 2 HCl).
Iron sulfide is not soluble and it is not problematic for a biogas
process and CHP unit.
When biogas plant works normally hydrogen sulfide is not problematic,
because of its oxidation with aerobic bacteria to elementary sulphur.
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