[Digestion] Meso and Thermophilic Operating Temperature
Richard L Vetter
r.vetter at sbcglobal.net
Mon Jun 9 16:28:16 CDT 2014
Good points. By increasing regeneration rate, one can increase loading rate and thereby increase total biogas production per fixed reactor volume. I have observed somewhat higher methane:carbon dioxide with thermophilic temperatures.....but, do not have supporting data. Rich Vetter
R. L. Vetter, PhD; PAS; Dipl. ACAN; President
AGRI-BIO SYSTEMS, INC.
2811 Edgewater Dr. Elgin, IL. 60124
Tel:847-888-2382
Fax:847-888-1484
Cell:630-564-8523
On Sunday, June 8, 2014 9:53 PM, "davidf at kingdombio.co.uk Fulford" <davidf at kingdombio.co.uk> wrote:
Bram and listers, Hello,
In my book, "Running a biogas programme" (1988) Practical Action, I present a simple First Order Rate model, developed at Cornell University. The theory separates the concepts of total yield of biogas and the rate of generation. Increasing temperature does not increase total yield, but it does increase the rate of generation (how quickly you can achieve that total yield). The variation of rate with temperature can be modeled with the Arrhenius equation, In my book, I present some results that were done by a student of mine, which show how the theory works in practice.
Best wishes,
Dr David Fulford
Kingdom Bioenergy Ltd
________________________________
From: "Heegde BA ter, Bram" <b.a.ter.heegde at st.hanze.nl>
Sent: Friday, June 06, 2014 11:28 AM
To: "digestion at lists.bioenergylists.org" <digestion at lists.bioenergylists.org>
Subject: Re: [Digestion] Meso and Thermophilic Operating Temperature
Thank you for that HOOROO, a very valuble resource, the S curve is indeed a very good fit.
However, it still leaves me with a question, or more of an area that isn't quite clear yet. You speak of rate, I assume you mean conversion rate. I've always believed and understood that conversion rate and yield are two sides of the same coin. If temperature increases the conversion rate, which is what the XL model does shows, doesn't it also mean that you are able to retrieve more biogas per kg of digestate. Which in my mind is an increase in yield. I am aware that at a given temperature the only way to increase yield is with loading rate and retention time.
I am however looking at the difference between the gas yield at ambient operating temperatures (ca. 20 degrees) and at the mesophilic range. What I've understood form quite a few research papers is that the yield and coversion rate wil increase.
I think that possibly my understanding in the difference of Yield and conversion rate my not be completly correct.
Regards.
Bram ter Heegde
NAW: 258757
Mob. Tel: 0653134337
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From: Digestion [digestion-bounces at lists.bioenergylists.org] on behalf of digestion-request at lists.bioenergylists.org [digestion-request at lists.bioenergylists.org]
Sent: 05 June 2014 20:00
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Subject: Digestion Digest, Vol 45, Issue 2
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1. Re: Meso and Thermophilic Operating Temperature
(Heegde BA ter, Bram)
2. Re: Meso and Thermophilic Operating Temperature
(harrisfm at aapt.net.au)
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Message: 1
Date: Thu, 5 Jun 2014 08:32:31 +0000
From: "Heegde BA ter, Bram"
To: "digestion at lists.bioenergylists.org"
Subject: Re: [Digestion] Meso and Thermophilic Operating Temperature
Message-ID:
<00C145A1644CD9468CEDDB6B9991F25F11E8C3BF at HPEMB08W28.hanze.nl>
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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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From: Digestion [digestion-bounces at lists.bioenergylists.org] on behalf of digestion-request at lists.bioenergylists.org [digestion-request at lists.bioenergylists.org]
Sent: 04 June 2014 20:00
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Subject: Digestion Digest, Vol 45, Issue 1
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Today's Topics:
1. Meso and Thermophilic Operating Temperature (Heegde BA ter, Bram)
2. Re: Meso and Thermophilic Operating Temperature (Les Gornall)
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Message: 1
Date: Wed, 4 Jun 2014 15:18:59 +0000
From: "Heegde BA ter, Bram"
To: "digestion at lists.bioenergylists.org"
Subject: [Digestion] Meso and Thermophilic Operating Temperature
Message-ID:
<00C145A1644CD9468CEDDB6B9991F25F11E8C356 at HPEMB08W28.hanze.nl>
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Dear all,
I am a student at the Hanze Universtity of Applied Sciences and am currently investigating the possibilty of using waste heat to heat a biogas digester.
However, somewhere in my research I came accross a graph depicting the gas yield from cow dung in a biogas digester at the meso and at the thermophilic range.
It would be very handy to have that graph, and it's source, however I have spent the last two days looking for it and can't seem to find it.
Hope someone can point me in the right direction.
Kind regards/Met vriendelijke groet;
Bram ter Heegde
NAW: 258757
Mob. Tel: 0653134337
------------------------------
Message: 2
Date: Wed, 4 Jun 2014 16:04:57 +0000
From: Les Gornall
To: For Discussion of Anaerobic Digestion
Subject: Re: [Digestion] Meso and Thermophilic Operating Temperature
Message-ID:
<4E83BE1704C70148BF9A0FC1ED1B54132DA72501 at EX01.projen.co.uk>
Content-Type: text/plain; charset="iso-8859-1"
http://www.pelagiaresearchlibrary.com/advances-in-applied-science/vol3-iss3/AASR-2012-3-3-1864-1869.pdf
This paper has a nice graph
Best Regards
Les Gornall
Process Consultant
PROjEN PLC
Process Consultant
DD: 01928 752 568
Email: les.gornall at projen.co.uk
PROjEN HOUSE
Wellfield
Preston Brook
Runcorn
WA7 3AZ
Reception: +44 (0) 1928 752 500
www.projenbioenergy.co.uk
-----Original Message-----
From: Digestion [mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Heegde BA ter, Bram
Sent: 04 June 2014 16:19
To: digestion at lists.bioenergylists.org
Subject: [Digestion] Meso and Thermophilic Operating Temperature
Dear all,
I am a student at the Hanze Universtity of Applied Sciences and am currently investigating the possibilty of using waste heat to heat a biogas digester.
However, somewhere in my research I came accross a graph depicting the gas yield from cow dung in a biogas digester at the meso and at the thermophilic range.
It would be very handy to have that graph, and it's source, however I have spent the last two days looking for it and can't seem to find it.
Hope someone can point me in the right direction.
Kind regards/Met vriendelijke groet;
Bram ter Heegde
NAW: 258757
Mob. Tel: 0653134337
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Message: 2
Date: Thu, 05 Jun 2014 18:44:04 +0800
From: harrisfm at aapt.net.au
To: "For Discussion of Anaerobic Digestion"
Subject: Re: [Digestion] Meso and Thermophilic Operating Temperature
Message-ID:
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?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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