[Digestion] Digestion Digest, Vol 53, Issue 8
CH SREENIVAS
cnu.biotech at gmail.com
Sun Feb 22 00:33:46 CST 2015
Thanks a lot for your valuable inputs sir.
On Sun, Feb 22, 2015 at 12:30 AM, <
digestion-request at lists.bioenergylists.org> wrote:
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> Today's Topics:
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> 1. Re: Available process models to understand the effect of
> operating parameters on anaerobic digestion (Anand Karve)
> 2. Re: Available process models to understand the effect of
> operating parameters on anaerobic digestion (Hoysall Chanakya)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 21 Feb 2015 07:48:48 +0530
> From: Anand Karve <adkarve at gmail.com>
> To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Available process models to understand the
> effect of operating parameters on anaerobic digestion
> Message-ID:
> <CACPy7SdZq6G0yqPs=
> JVq60yyrWQ_kDoUzc0V3G2O5Kt0VestMw at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Dear Sreenivas,
> we are dealing here with microbes. They not only have a very high rate
> of mutation but also a high degree of variability. If you started out
> with cattle dung as the source of microbes, you would get one set of
> results, but if you obtained the microbes from moors, rice paddies,
> lake beds or mangroves, you would get quite different results. I don't
> want to discourage you but only wish to alert you about the
> possibilities. A schoolgirl took my advice and used the mud from a
> pond near her house as the source of microbes. Her biogas system
> worked quite well at 20C.
> Yours
> A.D.Karve
> ***
> Dr. A.D. Karve
>
> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)
>
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
>
> On Fri, Feb 20, 2015 at 3:15 PM, CH SREENIVAS <cnu.biotech at gmail.com>
> wrote:
> > Dear members,
> >
> > I am working on "Understanding the influence of various operating
> parameters
> > (temperature, pH, etc.) on the quantity and quality of biogas from
> Anaerobic
> > Digestion".
> >
> > Could anyone let me know whether there are any open source process
> > simulation models (may be Aspen based, or some other platforms also
> would be
> > helpful) available for this study?
> >
> > Thanks in advance for sparing your valuable time.
> >
> > --
> > Thanks and Regards,
> > ==========================================================
> > CH Sreenivas
> > Research Scholar, IDP in Climate Studies, IIT Bombay
> > (M) - 07738853504, 09177667662
> > (O) - 022 - 2576 7877 / 4742
> > (R) - 09949344270,09963328094
> > mail ID: cnu.biotech at gmail.com, ch.sreenivas at iitb.ac.in
> > Website: https://sites.google.com/site/chigullapallisreenivasgupta/
> > ==========================================================
> >
> > "The only source of knowledge is experience" - Albert Einstein
> >
> > _______________________________________________
> > Digestion mailing list
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> >
> > for more information about digestion, see
> > Beginner's Guide to Biogas
> > http://www.adelaide.edu.au/biogas/
> > and the Biogas Wiki http://biogas.wikispaces.com/
> >
> >
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 21 Feb 2015 19:35:08 +0530
> From: "Hoysall Chanakya" <chanakya at astra.iisc.ernet.in>
> To: "For Discussion of Anaerobic Digestion"
> <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Available process models to understand the
> effect of operating parameters on anaerobic digestion
> Message-ID:
> <96eec3916b0ee23b415a734a0497e0d6.squirrel at www.astra.iisc.ernet.in
> >
> Content-Type: text/plain;charset=iso-8859-1
>
> Dear Sreenivas,
> For your modeling try ADM-1 and ADM-2 (anaerobic digestion model, ADM)
> which will handle the post hydrolysis component of anaerobic digestion.
>
> The hydrolysis stage is however a lot more difficult and not so straight
> forward. If you model this separately (based on past literature), you
> could put in a feed back loop that will drive the reaction forward as well
> as address feed back inhibition by accumulating VF acids. That should
> take care.
>
> Please remember you may not get a good process model for the entire AD
> process because only recently has been agricultural lignocellulosics
> entered the (market) basket of possible AD feedstocks. Although a lot
> many in the "Digestion Lists" have been long time practitioners, much to
> our dismay it did not become a popular option till very recently.
>
> Secondly it is quite possible that corn (stalk) grown in UK, Europe,
> Australia and Asia will have differing "digestibilities" (rate and extent)
> because the understanding of hydrolysis (unlike that described very often
> in the past) goes beyond a mere accounting for lignin and cellulose(s)
> content. This earlier approach considered that lignin was a uniformly
> placed barrier in the path of hydrolytic enzymes (and bacteria) and thus
> every for 1% of lignin concentration detected, it prevented 2%
> digestibility (circa 1980-90s). Today we seem to believe that lignin
> sub-units in Graminae (guaiacyl sub-units) are somewhat more degradable
> than their hard-wood cousins - although this may not lead to
> stoichiometrically accountable biogas production.
>
> In short "ENTER AT YOUR OWN RISK. THE ALLURE OF THE 'METHANOGENIC
> MERMAIDS' ARE QUITE ATTRACTIVE AND DIFFICULT TO DISREGARD"
>
> Try not to use Matlab and its peripherals on conventional PCs - the
> computing power will generally be inadequate. Instead you could create
> your own on Linux platforms while removing many of the lesser required
> reactions to start with.
>
> Best wishes
> Chanakya
>
> --
> Center for Sustainable Technologies
> Assoc. Faculty. Center for Contemporary Studies
> Center for Infrastructure, Sustainable Transport and Urban Planning
> (CiSTUP),
> Indian Institute of Science, Bangalore
>
>
> > Dear members,
> >
> > I am working on "Understanding the influence of various operating
> > parameters (temperature, pH, etc.) on the quantity and quality of biogas
> > from Anaerobic Digestion".
> >
> > Could anyone let me know whether there are any open source process
> > simulation models (may be Aspen based, or some other platforms also would
> > be helpful) available for this study?
> >
> > Thanks in advance for sparing your valuable time.
> >
> > --
> > Thanks and Regards,
> > ==========================================================
> > CH Sreenivas
> > Research Scholar, IDP in Climate Studies, IIT Bombay
> > (M) - 07738853504, 09177667662
> > (O) - 022 - 2576 7877 / 4742
> > (R) - 09949344270,09963328094
> > mail ID: cnu.biotech at gmail.com, ch.sreenivas at iitb.ac.in
> > Website: https://sites.google.com/site/chigullapallisreenivasgupta/
> > ==========================================================
> >
> > "The only source of knowledge is experience" - Albert Einstein
> >
> > --
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> >
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> >
> > for more information about digestion, see
> > Beginner's Guide to Biogas
> > http://www.adelaide.edu.au/biogas/
> > and the Biogas Wiki http://biogas.wikispaces.com/
> >
> >
>
>
>
> --
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>
> ------------------------------
>
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> for more information about digestion, see
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> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>
>
> ------------------------------
>
> End of Digestion Digest, Vol 53, Issue 8
> ****************************************
>
--
Thanks and Regards,
==========================================================
CH Sreenivas
Research Scholar, IDP in Climate Studies, IIT Bombay
(M) - 07738853504, 09177667662
(O) - 022 - 2576 7877 / 4742
(R) - 09949344270,09963328094
mail ID: cnu.biotech at gmail.com, ch.sreenivas at iitb.ac.in
Website: https://sites.google.com/site/chigullapallisreenivasgupta/
==========================================================
"The only source of knowledge is experience" - Albert Einstein
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