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<DIV><FONT face=Arial size=2>Igor, to my way of thinking, the use of
ferric chloride is expensive, because it is difficult to recover out of the
system and you have to keep buying more. I am not sure quite where you
intend to use it? If you are adding it to the input into the digester
it will settle inside and gradually clog your system. For
me, the best filter system is </FONT></DIV>
<DIV><FONT face=Arial size=2>a heavy steel, or a plastic
drum filled with bashed up rusty tin cans. Make sure they
are rusty, because new ones are still coated with a varnish that they use
instead of the old tin plate. Place the iron oxide
filter between the digester and the flexy gas bag for
storage. This makes for an even rate of flow with enough
moisture in the gas to activate the reaction. The H2S in the gas reacts
with the metalic iron or iron oxide and makes iron sulfide. When
nearly all the oxide has gone, and the only way to be really sure is to have two
drums in parallel and switch from one to the other at regular intervals,
all that is required to regenerate that drum is to open it to the
air.</FONT></DIV>
<DIV><FONT face=Arial size=2>In the presence of oyygen ferrous sulfide reverts
to metalic iron and elemental sulfur, along with the evolution of a lot of
heat With a heavy steel drum that is no problem, you just hook a
small blower onto one outlet. With a plastic drum its a case of just
opening the inlet and outlet .and positioning the drum in such a way that the
heat will </FONT></DIV>
<DIV><FONT face=Arial size=2>cause a convention flow of hot air. And if
the drum gets too hot reduce the air current. With all the iron
back into its metalic state the drum is ready for recycle, until there is so
much flowers of sulfur that every thing gets clogged
up. ATB. Ken C.</FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=igor.skrjanec@gmail.com href="mailto:igor.skrjanec@gmail.com">Igor
krjanec</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=digestion@lists.bioenergylists.org
href="mailto:digestion@lists.bioenergylists.org">For Discussion of Anaerobic
Digestion</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, October 06, 2010 12:55
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Digestion] (no
subject)</DIV>
<DIV><BR></DIV>Na 4.10.2010 20:15, Arturo Ávalos je pisal:
<BLOCKQUOTE cite=mid:058001cb63f0$2f347920$8d9d6b60$@com type="cite">
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<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Hello
all</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Does
someone know something about use ferric chloride to reduce the sulfur
content in the biogas?<O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Thanks
for the information<BR clear=all><O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN class=apple-style-span><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><O:P></O:P></SPAN></SPAN></P>
<P class=MsoNormal><I><O:P></O:P></I></P>
<P class=MsoNormal>Arturo<O:P></O:P></P></DIV><PRE wrap=""><FIELDSET class=mimeAttachmentHeader></FIELDSET>
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<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left><SPAN lang=EN-US style="FONT-FAMILY: 'Times New
Roman','serif'">Ferric chloride is normally use for a neutralizations
of H<SUB>2</SUB>S. Hydrogen sulfide is slightly soluble in water and acts as a
<A title="Weak
acid"
href="http://en.wikipedia.org/wiki/Weak_acid"><SPAN
style="COLOR: windowtext; TEXT-DECORATION: none">weak acid</SPAN></A>, because
of this is harmful for a CHP unit.</SPAN><SPAN style="FONT-FAMILY: 'Times New
Roman','serif'"></SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left><SPAN lang=EN-US style="FONT-FAMILY: 'Times New
Roman','serif'">H<SUB>2</SUB>S is a product of <A
title="Sulfate-reducing bacteria"
href="http://en.wikipedia.org/wiki/Sulfate-reducing_bacteria"><SPAN
style="COLOR: windowtext; TEXT-DECORATION: none">sulfate-reducing
bacteria</SPAN></A> which are also present in biogas reactor. <A
title="Sulfate-reducing bacteria"
href="http://en.wikipedia.org/wiki/Sulfate-reducing_bacteria"><SPAN
style="COLOR: windowtext; TEXT-DECORATION: none">Sulfate-reducing
bacteria</SPAN></A> use present sulfats from substrates to oxidize the organic
matter.</SPAN><SPAN style="FONT-FAMILY: 'Times New
Roman','serif'"></SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left><SPAN lang=EN-US style="FONT-FAMILY: 'Times New
Roman','serif'">Hydrogen sulfide reacts with metal ions to form metal
<A title=Sulfide href="http://en.wikipedia.org/wiki/Sulfide"><SPAN
style="COLOR: windowtext; TEXT-DECORATION: none">sulfides</SPAN></A>
(H<SUB>2</SUB>S + FeCl<SUB>2 </SUB>→ FeS + 2 HCl). Iron sulfide is not soluble
and it is not problematic for a biogas process and CHP unit.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'"></SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left><SPAN lang=EN-US style="FONT-FAMILY: 'Times New
Roman','serif'">When biogas plant works normally hydrogen sulfide is
not problematic, because of its oxidation with aerobic bacteria to elementary
sulphur.<BR></SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left><SPAN lang=EN-US style="FONT-FAMILY: 'Times New
Roman','serif'"><BR></SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left>Bye<BR></P>
<P class=MsoNormal style="LINE-HEIGHT: normal; TEXT-ALIGN: left"
align=left>Igor<BR><SPAN lang=EN-US style="FONT-FAMILY: 'Times New
Roman','serif'"></SPAN><SPAN style="FONT-FAMILY: 'Times New
Roman','serif'"></SPAN></P>
<P>
<HR>
<P></P>_______________________________________________<BR>Digestion mailing
list<BR>Digestion@lists.bioenergylists.org<BR>http://lists.bioenergylists..org/mailman/listinfo/digestion_lists.bioenergylists.org<BR></BLOCKQUOTE></BODY></HTML>