[Digestion] Digestion Digest, Vol 65, Issue 5

Sat Jun 11 15:42:09 CDT 2016

Hi which textbooks should I refer too thanks
On Jun 10, 2016 8:01 PM, <digestion-request at lists.bioenergylists.org> wrote:

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>    1. Re: Hi (Anand Karve)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 10 Jun 2016 13:29:00 +0530
> From: Anand Karve <adkarve at gmail.com>
> To: For Discussion of Anaerobic Digestion
>         <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Hi
> Message-ID:
>         <CACPy7Sctk6GqCZktfR1=yafpoYxq=
> jVr9VdeteZgAYmjNBe0zA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dear Paul,
> the so called ideal C/N value of 20 to 30 represents the C/N of cattle
> dung, which is not an ideal feedstock. Almost 90% of the dry weight of dung
> consists of non-digestible matter. Only the mucus and the load of bacteria
> in the dung are digestible. I reproduce below the part of my original
> article to clarify what I meant::
>  Textbooks lay a lot of emphasis on a value called Carbon/Nitrogen (C/N)
> ratio of the feedstock. The textbooks state 25 to be the ideal C/N ratio.
> This is the C/N ratio of dung, but it is a relic of the past when dung was
> universally considered to be the ideal feedstock. It has already been
> discussed how dung, representing the effluent slurry of a living biogas
> plant, can hardly be considered to be the ideal feedstock. Sugars,
> starches, cellulose, fats and digestible proteins show 100% digestibility.
> Of these substances, sugars, starches, cellulose and fats have C/N=*?,
> *whereas
> the C/N ratio of proteins is just 4 or 5. And yet, all of them show the
> v.s.% value of 100. One should realize that as a living system, a biogas
> plant requires all the inorganic components that a living cell needs, and
> that it is illogical to take only the nitrogen content of the system into
> consideration.
> 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 Wed, Jun 8, 2016 at 11:45 AM, Paul Harris <harrisfm at aapt.net.au> wrote:
>
> > G'day All,
> >
> > While I am happy to agree to differ on some of Dr A,D.Karve's ideas I
> > disagree with points 6) and 7) below (if taken at face value).
> >
> > 6) There should be a C:N ratio of approximately 20-30:1. The exact value
> > is not critical, but microbes need both these nutrients (and other
> > elements) to survive. Too much N will result in ammonia and too much C
> > probably reduces the biogas quality.
> >
> > 7) Retention Time (RT) is reasonably important! Too short a RT results in
> > "washout", which stops digestion. The actual "washout" RT depends on
> > operating temperature, as this influences microbial growth rate. Best use
> > of digester volume occurs at a RT about twice the "washout" time, but
> > longer RTs result in more biogas per unit influent and more robust
> > operation.
> >
> >
> > Retention Time
> > Temp. Gwth Rte Washout "Optimum"
> > (OC) (days-1) (days) (days)
> > 5 0.020 49.0 97.9
> > 10 0.034 29.4 58.9
> > 15 0.056 17.7 35.5
> > 20 0.093 10.8 21.6
> > 25 0.150 6.7 13.3
> > 30 0.233 4.3 8.6
> > 35 0.336 3.0 6.0
> > 40 0.434 2.3 4.6
> > 45 0.502 2.0 4.0
> > I hope this is some help,
> >
> > HOOROO
> > Mr Paul Harris
> >
> > On 06-Jun-16 1:30 PM, Anand Karve wrote:
> >
> > *Biogas technology revisited*
> >
> > Dr.A.D.Karve
> >
> > Samuchit Enviro Tech P. Ltd. Law College Road, Ekata Park Co-Op. Housing
> > Society, Behind Nirmitee Showroom, Erandawane, Pune 411 004 (
> > adkarve at gmail.com)
> >
> > Abstract: In spite of new knowledge gained since the advent of the 21st
> > century the biogas researchers still use some of the older concepts.  The
> > new concepts pointed out in this article are 1) Because the biogas
> > producing microbes reside in the intestines of animals, they eat what the
> > animals eat. 2) Breeding super-methanogens can be achieved, but their use
> > in a biogas plant would not be practical, as it would be impossible to
> > maintain them. 3) All animals represent living biogas plants, and
> therefore
> > the fecal matter of animals is the effluent slurry of a biogas plant. The
> > biogas producing microbes are found universally in the fecal matter of
> > animals because they exit the animal body along with dung.  4)Even the
> > anaerobic microbes need oxygen for their metabolism. They extract the
> > chemically bound oxygen from their feedstock.  Therefore, feedstock of a
> > biogas plant must have oxygen in its chemical make up. The same is also
> > true of food eaten by animals. 5)The value called % volatile solids
> > actually represents the % digestibility of the concerned substance.
> 6)There
> > is no justification for laying emphasis on the C/N ratio of a feedstock.
> 7)
> > There is no justification for laying emphasis on the hydraulic retention
> > time of a biogas plant. It is a useless concept. 8) In a biphasic system,
> > the feedstock is first treated aerobically and then subjected to
> anaerobic
> > conditions. This is wrong, because most of the organic carbon, which
> would
> > have yielded methane in the anaerobic phase, gets oxidized in the aerobic
> > phase itself, leading to drastic reduction in the methane yield.
> >
> > ***
> > Dr. A.D. Karve
> >
> > Chairman, Samuchit Enviro Tech Pvt Ltd ( <http://www.samuchit.com>
> > www.samuchit.com)
> >
> > Trustee & Founder President, Appropriate Rural Technology Institute
> (ARTI)
> >
> > On Mon, Jun 6, 2016 at 6:44 AM, Kelvin masule <kmasule97 at gmail.com>
> wrote:
> >
> >> Guys do u have any information about biogas?
> >>
> >> _______________________________________________
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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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> > for more information about digestion, see
> > Beginner's Guide to Biogashttp://www.adelaide.edu.au/biogas/
> > and the Biogas Wiki http://biogas.wikispaces.com/
> >
> >
> >
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> > for more information about digestion, see the Biogas Wiki
> > http://biogas.wikispaces.com/
> >
> >
> >
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