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Edward,<br>
<br>
<div class="moz-cite-prefix">On 6/24/2013 1:08 AM, Edward Silalahi
(Medan) wrote:<br>
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<blockquote
cite="mid:916A29D06C25AE49832D570499DDA27402F3B7F9@medaai23.medan.lcl"
type="cite">
<pre wrap="">Dear David, [...]
3. Our waste are Palm Oil Mill Effluent (POME) with COD approximate
70.000 to 80.000 ppm, my question how could I raise the efficiency of my
bio gas production?</pre>
</blockquote>
<br>
This is a different David.<br>
<br>
I did a little work on POME in the Dominican Republic. As you may
know,
the effluent from palm oil processing is relatively dilute, and
digesters using it are subject to wash-out, which means that the
slow-growing biogas microbes-- the methanogens-- may not have time
to
multiply and become numerous before the effluent exits the digester.
One
way to handle this is to provide increased surface area-- sheets or
tarps or baffles or what-have-you-- inside the digester, because the
methanogens like to become part of a biofilm. ("Biofilm" is a term
which
generally means an ecosystem on a surface, where, in the case of
anaerobic digestion, the community of microbes would cooperate to
digest
the effluent. Because these biofilms develop on surfaces, increased
surface area inside the digester will serve to anchor methanogens,
better inoculate incoming effluent, and thereby help prevent
wash-out.)<br>
<br>
Other than that, several different kinds of digesters can be used,
but
be aware that there are often significant design differences between
digesters that are built to use such dilute inputs and digesters
that
are built to use materials with far higher solids content. For
example,
the up-flow anaerobic sludge blanket (UASB)-type digesters are
suited to
this type of input. One reference you may be able to use to
understand
more about your situation is "
<meta http-equiv="Content-Type" content="text/html;
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A Biogas Trapping Facility for Handling Palm Oil Mill
Effluent", found <a
href="http://palmoilis.mpob.gov.my/publications/TOT/TT-491.pdf">here</a>.<br>
<br>
Based on my brief review of your website, it is clear that your
facility
is either already or is trying to become a member of RSPO, the
Roundtable on Sustainable Palm Oil. Your biogas effort should be
integrated into the documentation you supply about this.<br>
<br>
<br>
<br>
d.<br>
<div class="moz-signature">-- <br>
<div style="font:Georgia" ;=""><span style="font-size:110%;">David
William House<br>
</span>
<div style="padding-left:3em;font-size:80%;">"The Complete
Biogas Handbook" <code><a href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
href="www.vahidbiogas.com">www.vahidbiogas.com</a><br>
<br>
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<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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