Quantity of Biogas per 1 metric ton of slurry
Moderator:Bob
Please find me the amount of biogas generated per one metric ton of feedstock slurry for some organic materials as much as available.
Bob, I am sorry for not being explicit earlier.
Please consider the following parameters:
Feedstock - slurry of about 13% solids.
Continuous Process - Continuous Flow Stirred Tank (CFST) digester to be charged initially with 112 cubic metre, then regularly at 14 cubic metre per day.
Retention Time of 8 days.
Loading Rate - 14 cubic metre/day.
Temperature: 35 - 37 degree C.
C/N ratio = 24
Thank you.
[This message has been edited by ayo (edited 02-21-2003).]
Please consider the following parameters:
Feedstock - slurry of about 13% solids.
Continuous Process - Continuous Flow Stirred Tank (CFST) digester to be charged initially with 112 cubic metre, then regularly at 14 cubic metre per day.
Retention Time of 8 days.
Loading Rate - 14 cubic metre/day.
Temperature: 35 - 37 degree C.
C/N ratio = 24
Thank you.
[This message has been edited by ayo (edited 02-21-2003).]
-
nathan_lamothe
- Posts:58
- Joined:Sat Sep 21, 2002 11:01 pm
- Location:Joussard, Alberta, Canada
Ayo,
Have you found Bob's AD Calculator http://biorealis.com/wwwroot/digester_revised.html yet?
It might be a starting point...
Have you found Bob's AD Calculator http://biorealis.com/wwwroot/digester_revised.html yet?
It might be a starting point...
Ayo, I'm still not sure what your feedstock is, nor do I have direct experience with either the type or size of digester that you are proposing. Having said that, however, (assuming you are digesting animal manure?) the literature suggests that you can expect average biogas production rates in the following range:
<pre>
Source / Biogas Production / % VS destruction
Cattle, beef / 458 cc/gm VS destroyed / 50%
Cows, dairy / 248 cc/gm / 30%
Pig / 538 cc/gm / 50%
Poultry / 367 cc/gm / 60%
</pre>
Caveat: These numbers are compiled averages from numerous sources, (as reported in Biogas Handbook ISBN 0-9125238-47-0) and should be used with caution. To determine actual biogas production from your specific substrate, you will need to conduct some direct experiments. Given the (apparent) high loading rate (13% solids, 8 day HRT?) I would suspect that your output may well be on the lower end of the reported averages (as less of the VS will be destroyed).
[Hi, Nathan. Thanks for the pointer. But I'm thinking that my calculator would probably overestimate biogas production from the digester as I understand it, anyway.]
[This message has been edited by Bob (edited 02-24-2003).]
<pre>
Source / Biogas Production / % VS destruction
Cattle, beef / 458 cc/gm VS destroyed / 50%
Cows, dairy / 248 cc/gm / 30%
Pig / 538 cc/gm / 50%
Poultry / 367 cc/gm / 60%
</pre>
Caveat: These numbers are compiled averages from numerous sources, (as reported in Biogas Handbook ISBN 0-9125238-47-0) and should be used with caution. To determine actual biogas production from your specific substrate, you will need to conduct some direct experiments. Given the (apparent) high loading rate (13% solids, 8 day HRT?) I would suspect that your output may well be on the lower end of the reported averages (as less of the VS will be destroyed).
[Hi, Nathan. Thanks for the pointer. But I'm thinking that my calculator would probably overestimate biogas production from the digester as I understand it, anyway.]
[This message has been edited by Bob (edited 02-24-2003).]