<div>Dear Mr. Muthui,</div>
<div>aerobic reactions combine atmospheric oxygen with the substrate. This type of oxydation is exothermic. You can compare it with combustion of biomass. Being living organisms, the methanogens do need oxygen for their metabolism, but they take it up from the feedstock and not from the atmosphere. This is how they convert acetic acid, a carbohydrate, into methane, which is a hydrocarbon. This reaction does not give out any energy in the form of heat.<br>
Yours</div>
<div>A.D.Karve<br></div>
<div class="gmail_quote">On Tue, Nov 20, 2012 at 2:13 PM, Paul Muthui <span dir="ltr"><<a href="mailto:paul@takamotobiogas.com" target="_blank">paul@takamotobiogas.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote"><br clear="all">
<div>G'day All,</div>
<div><br></div>
<div>How much energy is given out in the digesters as a result of anaerobic reaction? I can't seem to get any publication with enough details on this. I would like to know the temperature rise that would be caused by the reaction. </div>
-- <br><font color="#6633ff"><b>Best Regards</b>, </font>
<div><font color="#6633ff"><br></font></div>
<div><font color="#6633ff"> </font></div>
<div>
<div>
<div><font color="#6633ff" face="verdana, sans-serif"><b>Paul S. Muthui</b></font></div></div>
<div><b><font color="#6633ff" face="'comic sans ms', sans-serif">Research & Development Engineer</font></b></div>
<div><font color="#6633ff"><b><font face="'comic sans ms', sans-serif">Schutter Energy Ltd.</font></b></font></div>
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<br><br></blockquote></div><br><br clear="all"><br>-- <br>***<br>Dr. A.D. Karve<br>Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)<br><br><br>