[Digestion] Meso and Thermophilic Operating Temperature

[harrisfm at aapt.net.au]

 G'day Bram,
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.
I have not followed ammonia loading.
Good luck,HOOROO

----- Original Message -----
From: "For Discussion of Anaerobic Digestion" 
To:"digestion at lists.bioenergylists.org" 
Cc:
Sent:Thu, 5 Jun 2014 08:32:31 +0000
Subject:Re: [Digestion] Meso and Thermophilic Operating Temperature

 Thank you for the paper, it is indeed an interesting graph, however
not quite the one I was looking for. 

 Maybe I should be a little clearer as to what I am trying to
achieve/inverstigate. 

 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. 

 That is the main issue Im trying to solve at the moment. 

 Secondly I'm interested in the effect of ammonia loading at increased
digester temperatures. 

 Met vriendelijke groet;

 Bram ter Heegde
 NAW: 258757
 Mob. Tel: 0653134337

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