[Digestion] (no subject)

[Igor Škrjanec]

  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
>
> / /
>
> Arturo
>
>
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Hallo Arturo


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.


Bye

Igor

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