[Digestion] Digestion Digest, Vol 20, Issue 8

Wed May 2 06:05:21 CDT 2012

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.orgSent: Tue, 01 May 2012 00:31:39 To: digestion at lists.bioenergylists.orgSubject: Digestion Digest, Vol 20, Issue 8Send Digestion mailing list submissions to   digestion at lists.bioenergylists.orgTo subscribe or unsubscribe via the World Wide Web, visit   http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.orgor, via email, send a message with subject or body 'help' to   digestion-request at lists.bioenergylists.orgYou can reach the person managing the list at   digestion-owner at lists.bioenergylists.orgWhen replying, please edit your Subject line so it is more specificthan "Re: Contents of Digestion digest..."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: 1Date: Mon, 30 Apr 2012 11:04:17 +0000From: "Jones, Robin (TWP)" <RJones at twp.co.za>To: "digestion at lists.bioenergylists.org"   <digestion at lists.bioenergylists.org>Subject: [Digestion] Nitrogen in effluentMessage-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.-------------- next part --------------An HTML attachment was scrubbed...URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20120430/25bf5a94/attachment-0001.html>------------------------------Message: 2Date: Mon, 30 Apr 2012 14:05:35 +0200From: 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 effluentMessage-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 ?RegardsMichael K?ttner---________________________________F?rdergesellschaft nachhaltige Biogas und Bioenergienutzung (FnBB) e.V.German Biogas and Bioenergy Society (GERBIO)Am Feuersee 874592 Kirchberg/JagstGermanyFon: +49 (0)7954 921969Fax: +49 (0)7954 926132www.fnbb.orgwww.gerbio.orgVorstandsvorsitzender/Chairman: Dipl. Agr.biol. Michael K?ttnerStellvertretender Vorsitzender/Vice-Chairman: Dipl.Ing. Heinz-Peter MangRegistergericht: Amtsgericht LangenburgRegisternummer: VR224Steuernummer: 57075/04800Am 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: 3Date: Mon, 30 Apr 2012 11:54:50 -0700From: Vianney Tumwesige <trustvianney at gmail.com>To: For Discussion of Anaerobic Digestion   <digestion at lists.bioenergylists.org>Subject: [Digestion] Sizing a flexible balloon digesterMessage-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 onthe basis of the chosen retention time *RT* and the daily substrate inputquantity *Sd*. For a simple digester design, the retention time shouldamount to at least 40 days  - RT = retention time = 40 days  - Sd = daily substrate quantity = manure plus water  - Volume of digester, Vd = Sd ? RTThe ratio *Vd *? *Vg *(digester volume ? gasholder volume) is a majorfactor when designing a biogas digester. For a typical agricultural biogasplant, the *Vd/Vg*-ratio amounts to somewhere between 3:1 and 10:1, with5:1 - 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 theabove equations) which would be installed in different households. Thedaily feedstock, volume of biogas storage and retention time being thedeterminant factors. Retention time was however fixed at 40 days.I will be glad to get guided.Thanks in advance.Best regards,*-- Vianney TumwesigeDirector - Green Heat (U) Ltd  [image: Picture]P.O. Box 10235Kampala-Uganda256 (0) 71 237 9889"The more people are self sufficient in cooking fuel, the more personal andfinancial freedom they have." - Emma Casson<http://trustvianney.wordpress.com/>-------------- next part --------------An HTML attachment was scrubbed...URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20120430/1032f18e/attachment-0001.html>------------------------------_______________________________________________Digestion mailing listto Send a Message to the list, use the email addressDigestion at bioenergylists.orgto UNSUBSCRIBE or Change your List Settings use the web pagehttp://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.orgfor more information about digestion, seeBeginner's Guide to Biogashttp://www.adelaide.edu.au/biogas/and the Biogas Wiki http://biogas.wikispaces.com/End of Digestion Digest, Vol 20, Issue 8****************************************
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