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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Wayne,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>why would you transform oil and fat into biogas when you can
burn its directly in commercial gensets to produce electrical energy(
efficiency 36/38%)?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Alessandro Francese<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'>Da:</span></b><span
style='font-size:10.0pt;font-family:"Segoe UI","sans-serif"'>
digestion-bounces@lists.bioenergylists.org [mailto:digestion-bounces@lists.bioenergylists.org]
<b>Per conto di </b>Wayne Zschech<br>
<b>Inviato:</b> mercoledì 5 ottobre 2011 9.47<br>
<b>A:</b> digestion@lists.bioenergylists.org<br>
<b>Oggetto:</b> [Digestion] biogas from restaurant oil & food waste<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>G'day All!<br>
<br>
The waste vegetable oil we collect from the restaurants has up about 10-12%
water and food waste in it. We heat the oil up to 65oC and then drop this
'soup' out from the bottom. We want to utilize this waste about 1,5-2,0
tonnes per month as a feedstock for biogas production. We also end up
with about 500kg of rancid fats/oils that we can't use for biodiesel
production.<br>
<br>
I understand that both the soup and the rancid fats should be able to give me
lots of gas but don't know how to calculate the needed reactor volume. I'm also
concerned that the fat will float at the top of the reactor and cause problems.
Could anyone give some reactor design tips for these feedstocks? <br>
<br>
Also is it possible to produce a digestate that can be used as animal feed or
feed supplement? from this waste? from restaurant food waste in
general? We have long winters and I don't want to have to store the
digestate as fertilizers for many months if I can produce a product local pig
farmers can use. It has been suggested that I should make batch type
reactors so as to be sure that all the organics have been digested before
'packaging' or storing it. Are pathogens likely to be a problem?
Should I consider thermophilic temperatures? I've read that heating such waste
to 70oC for 1 hour is the industry standard.<br>
<br>
What other problems can I expect to encounter. <br>
<br>
Any input would be appreciated.<br>
Many blessings,<br>
Wayne<o:p></o:p></p>
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