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Arturo,<br>
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On 10/4/2010 11:15 AM, Arturo Ávalos wrote:
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<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Arial","sans-serif"; color: black;"
lang="EN-US">Hello all</span><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: black;" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
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<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Arial","sans-serif"; color: black;"
lang="EN-US">Does someone know something about use ferric
chloride to reduce
the sulfur content in the biogas?</span></p>
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<br>
TCBH, pg 87:<br>
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<blockquote>
<blockquote>
<p class="MsoNormal">Henry<span style=""> </span>(1961) claims
that at mesophilic temperatures
and pH 5.0, 98% of all of the sulfides dissolved in the slurry
show up as H<sub><span class="sub"><span style="font-size:
12pt;">2</span></span></sub>S,
whereas at pH 7.2, this is reduced to 24% with an approximate
50% reduction for
each 0.2 pH unit increase thereafter (e.g., 12% at 7.4, 6% at
7.6, 3% at 7.8,
1.5 % at 8.0). Where scrubbing H<sub><span class="sub"><span
style="font-size: 12pt;">2</span></span></sub>S is
desirable but unrealistic for
some reason, pH adjustment may be the answer— but take care
not to over-adjust.
A further idea is the addition of the ferric ion of iron;
Henry used ferric
chloride at the rate of about 2 grams per liter. This tied up
the sulfide ion
and no H<sub><span class="sub"><span style="font-size: 12pt;">2</span></span></sub>S
was produced in a digester with this high dosage of ferric
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<br>
The reference is to:
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<![endif]-->Henry. 1961. <span style="font-style: normal;">Hydrogen
Sulfide
in Sludge Gas.</span> J. Water Pollu. Control Fed. 33:140.
<br>
<br>
<br>
<br>
d.<br>
<div class="moz-signature">-- <br>
<div style=""><span style="font-size: 110%;">David William House<br>
</span>
<div style="padding-left: 3em; font-size: 80%;">"The Complete
Biogas Handbook" <code><a>www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a>www.vahidbiogas.com</a><br>
<br>
</code></div>
<div style="padding-left: 2em;">"Make no search for water.
But find thirst,<br>
And water from the very ground will burst."
<div style="padding-left: 2em; font-size: 80%;">(Rumi, a
Persian mystic poet, quoted in <em>Delight of Hearts</em>,
p. 77) <br>
<br>
<a class="moz-txt-link-freetext" href="http://bahai.us/">http://bahai.us/</a></div>
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