[Digestion] Digestion Digest, Vol 53, Issue 8

Sun Feb 22 06:53:49 CST 2015

Dear Prof. Chanakya,
it is our experience that anything that is eaten by humans, cattle or
even by carnivores yields biogas if it is used as feedstock. This
automatically means that dry stalks of grass and cereal crops can be
used as feedstock in a biogas plant.
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 Sun, Feb 22, 2015 at 12:03 PM, CH SREENIVAS <cnu.biotech at gmail.com> wrote:
> 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:
>>
>>    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
>> >
>> > to Send a Message to the list, use the email address
>> > Digestion at bioenergylists.org
>> >
>> > to UNSUBSCRIBE or Change your List Settings use the web page
>> >
>> > http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>> >
>> > 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
>> >
>> > --
>> > This message has been scanned for viruses and
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>> > believed to be clean.
>> >
>> > _______________________________________________
>> > Digestion mailing list
>> >
>> > to Send a Message to the list, use the email address
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>> >
>> > http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>> >
>> > 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/
>> >
>> >
>>
>>
>>
>> --
>> This message has been scanned for viruses and
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>> believed to be clean.
>>
>>
>>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
>>
>> _______________________________________________
>> 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/
>>
>>
>>
>> ------------------------------
>>
>> 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
>
> _______________________________________________
> Digestion mailing list
>
> to Send a Message to the list, use the email address
> Digestion at bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>
> 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/
>
>