[Digestion] Digestion Digest, Vol 20, Issue 8

Anand Karve adkarve at gmail.com
Wed May 2 23:56:37 CDT 2012


Dear All,
I had already stated some time ago that the biogas production from any
given feedstock was equivalent to its in vitro dry matter digestibility
(IVDMD). Dung consists of a large load of lignin, which the digestive
system of cattle cannot digest. The anaerobic microbes too cannot digest
it. But, being an organic substance, the carbon content of lignin is very
high, which imparts to dung the classical C/N ratio of 20 to 30. I propose,
that while considering the C/N ratio, one should disregard the
non-digestible matter in the feedstock. If one  takes into consideration
only the digestible matter in the dung, the C/N ratio would be reduced to
something like 4 or 5. We have successfully used oilcake of castor,
Jatropha and Pongamia continuously for months as feedstock. They too have a
C/N ratio of about 4 or 5, which never interfered with the biogas
production.
Yours
A.D.Karve

On Wed, May 2, 2012 at 7:05 PM, Choppalli Venkata Krishna <
krishnacreat1 at rediffmail.com> wrote:

> The confusion is - Mix up of all droppings, like Poultry, Cattle, Pigs
> etc. Poultry droppings C/N is as such will pose problem for methogenic
> bacteria as Nitrogen is high. If all combined, C/N can be kept between 20
> to 30, you will have no problem. Each feed by weight everyday is to be
> monitored especially for poultry, so that the C/N of that weight feed has
> to be mixed with some other to bring its C/N to 20 to 30.
> -Krishna
>
>
>
>
>
>
> From: digestion-request at lists.bioenergylists.org
> Sent: Tue, 01 May 2012 00:31:39
> To: digestion at lists.bioenergylists.org
> Subject: Digestion Digest, Vol 20, Issue 8
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> Today's Topics:
>
>   1. Nitrogen in effluent (Jones, Robin (TWP))
>   2. Re: Nitrogen in effluent (Michael K?ttner)
>   3. Sizing a flexible balloon digester (Vianney Tumwesige)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 30 Apr 2012 11:04:17 +0000
> From: "Jones, Robin (TWP)" <RJones at twp.co.za>
> To: "digestion at lists.bioenergylists.org"
>    <digestion at lists.bioenergylists.org>
> Subject: [Digestion] Nitrogen in effluent
> Message-ID:
>    <EBF00BF5F1C23F469A34595277A538CC658E3212 at ZAATRFS27.twp.co.za>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> We are in the  feasibility stage for a  3MWe power generation plant using
> a bio digester (Continuous Flow) located adjacent to cattle feedlots.. The
> available feeds are tallow, cattle and chicken manure. The mass balance
> indicates a very high nitrogen content in the effluent (?5000mg/ltr). The
> effluent's rate of discharge is also significant posing a very real
> environmental concern. Has anyone had previous experience with similar
> effluents and if so what was the strategy to mitigate environmental risk
> without adding significant CAPEX, OPEX and parasitic loads.
>
> Considering the concentration of Nitrogen, we understand that this is not
> really a viable option for raw fertiliser (i.e. direct irrigation onto
> crops). It is understood that this would need to be concentrated up to
> reduce the volume prior to transporting to a fertiliser production facility
> approximately 80km away.
>
> Any comments related to this would be much appreciated.
>
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> ------------------------------
>
> Message: 2
> Date: Mon, 30 Apr 2012 14:05:35 +0200
> From: Michael K?ttner <m.koettner at biogas-zentrum.de>
> To: For Discussion of Anaerobic Digestion
>    <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Nitrogen in effluent
> Message-ID: <201204301405.35380.m.koettner at biogas-zentrum.de>
> Content-Type: Text/Plain;  charset="iso-8859-15"
>
> Dear Robin Jones,
>
> also with a high nitrogen load of 5000mg/l and more a safe AD process
> operation is possible.
>
> What kind of technology is foreseen ?
>
> Regards
>
> Michael K?ttner
>
> ---
>
> ________________________________
>
> F?rdergesellschaft nachhaltige Biogas und Bioenergienutzung (FnBB) e.V.
> German Biogas and Bioenergy Society (GERBIO)
> Am Feuersee 8
> 74592 Kirchberg/Jagst
> Germany
>
> Fon: +49 (0)7954 921969
> Fax: +49 (0)7954 926132
>
> www.fnbb.org
> www.gerbio.org
>
> Vorstandsvorsitzender/Chairman: Dipl. Agr.biol. Michael K?ttner
> Stellvertretender Vorsitzender/Vice-Chairman: Dipl.Ing. Heinz-Peter Mang
> Registergericht: Amtsgericht Langenburg
> Registernummer: VR224
> Steuernummer: 57075/04800
>
>
>
>
> Am Montag, 30. April 2012, 13:04:17 schrieb Jones, Robin (TWP):
> > We are in the  feasibility stage for a  3MWe power generation plant
> using a
> > bio digester (Continuous Flow) located adjacent to cattle feedlots.. The
> > available feeds are tallow, cattle and chicken manure. The mass balance
> > indicates a very high nitrogen content in the effluent (?5000mg/ltr). The
> > effluent's rate of discharge is also significant posing a very real
> > environmental concern. Has anyone had previous experience with similar
> > effluents and if so what was the strategy to mitigate environmental risk
> > without adding significant CAPEX, OPEX and parasitic loads.
> >
> > Considering the concentration of Nitrogen, we understand that this is not
> > really a viable option for raw fertiliser (i.e. direct irrigation onto
> > crops). It is understood that this would need to be concentrated up to
> > reduce the volume prior to transporting to a fertiliser production
> > facility approximately 80km away.
> >
> > Any comments related to this would be much appreciated.
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 30 Apr 2012 11:54:50 -0700
> From: Vianney Tumwesige <trustvianney at gmail.com>
> To: For Discussion of Anaerobic Digestion
>    <digestion at lists.bioenergylists.org>
> Subject: [Digestion] Sizing a flexible balloon digester
> Message-ID:
>    <CAKOf9r4F3e_9im4OFhNtOGmRQsmPD=Dw30KwBy+kLNGcomyO0A at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Guess all is well.
>
> *Sizing a biogas unit*
>
> The size of the digester, i.e. the digester volume *Vd*, is determined on
> the basis of the chosen retention time *RT* and the daily substrate input
> quantity *Sd*. For a simple digester design, the retention time should
> amount to at least 40 days
>
>
>   - RT = retention time = 40 days
>   - Sd = daily substrate quantity = manure plus water
>   - Volume of digester, Vd = Sd ? RT
>
> The ratio *Vd *? *Vg *(digester volume ? gasholder volume) is a major
> factor when designing a biogas digester. For a typical agricultural biogas
> plant, the *Vd/Vg*-ratio amounts to somewhere between 3:1 and 10:1, with
> 5:1 - 6:1 occurring most frequently.
>
>
>   -  Volume of gas (Vg) = 1/3Vd
>   - Total volume required = Vd + Vg
>
> *
> I need to estimate the volume of the flexible balloon digester (using the
> above equations) which would be installed in different households. The
> daily feedstock, volume of biogas storage and retention time being the
> determinant factors. Retention time was however fixed at 40 days.
>
> I will be glad to get guided.
>
> Thanks in advance
> .
>
> Best regards,
> *
>
> --
> Vianney Tumwesige
> Director - Green Heat (U) Ltd  [image: Picture]
> P.O. Box 10235
> Kampala-Uganda
> 256 (0) 71 237 9889
>
> "The more people are self sufficient in cooking fuel, the more personal and
> financial freedom they have." - Emma Casson
>
>
> <http://trustvianney.wordpress.com/>
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> End of Digestion Digest, Vol 20, Issue 8
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-- 
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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