<html><body style="font-family: 'Helvetica Neue',Helvetica,Arial,sans-serif; font-size: 12px;"> G'day Bram,<div><br /></div><div>Chen's Model (available in XL as digcalc.zip at biogas.wikispaces.com/Online+Course) shows that it is just the RATE that changes with temperature, the YIELD only changes with loading rate/retention time. If you treat a given volume of effluent for longer Retention Times at lower temperatures you will get the same volume of biogas. In the "normal" mesophilic range a linear relationship of rate to temperature is a good fit, but I found the best fit for 10C to 50C(?) is an S curve. I don't have access to XL or my files on this computer so can't give more assistance at the moment.</div><div><br /></div><div>I have not followed ammonia loading.</div><div><br /></div><div>Good luck,</div><div>HOOROO<br /><blockquote><br />----- Original Message -----<br /><div style="width:100%;background:rgb(228,228,228);"><div style="font-weight:bold;">From:</div> "For Discussion of Anaerobic Digestion" <digestion@lists.bioenergylists.org></div><br /><div style="font-weight:bold;">To:</div>"digestion@lists.bioenergylists.org" <digestion@lists.bioenergylists.org><br /><div style="font-weight:bold;">Cc:</div><br /><div style="font-weight:bold;">Sent:</div>Thu, 5 Jun 2014 08:32:31 +0000<br /><div style="font-weight:bold;">Subject:</div>Re: [Digestion] Meso and Thermophilic Operating Temperature<br /><br /><br />
Thank you for the paper, it is indeed an interesting graph, however not quite the one I was looking for. <br /><br />
Maybe I should be a little clearer as to what I am trying to achieve/inverstigate. <br /><br />
Two things that I would like to find out are, firstly, what is the effect of increasing digester temperature on gas Yield. With this I mean not only the absolute amount of gas produced but also the effect that temperature has on reaction time of the digester. I would also be interested in if the yield increases in an linear pattern in relation to the temperature, or if it is exponential/non-linear/etc, This is why I was looking for the graph of temp vs. biogas yield. I seem to remember that it wasn't a linear relationship. However, form experiments it does look like a linear relationship. <br /><br />
That is the main issue Im trying to solve at the moment. <br /><br />
Secondly I'm interested in the effect of ammonia loading at increased digester temperatures. <br /><br />
Met vriendelijke groet;<br /><br />
Bram ter Heegde<br />
NAW: 258757<br />
Mob. Tel: 0653134337<br /></blockquote></div></body></html>