Dear Dr. Karve, Thank you for your response. The main objective of the installation is to valorise the organic fraction of the incoming solid waste thereby diverting it from landfill. The reason I was thinking of digestion was more as a space saver compared to composting. Indeed the site we have been supplied with may be slightly on the small side for composting such large amounts. The methane is really just a bonus in the system and a lesser amount may not be such a problem.
What would be the space requirements and retention times of a purely oxidative system as you described in your previous note? Do you have examples of somewhere such a system is installed and running? Would the output really be only water and CO2, surely there will be a substantial solid fraction? If so, can it be used as fertiliser? Thanks again Aiden On Wed, May 16, 2012 at 12:48 AM, Anand Karve <adka...@gmail.com> wrote: > Dear Mr. Short, > do you wish to convert the organic fraction into methane or carbon > dioxide? Nisargaruna is a biphasic system, in which the material is first > subjected to aerobic digestion, using water preheated by a solar water > heating system. The aerobically digested material is then introduced into > an anaerobic chamber to get methane out of it. In this process, the more > easily digested fraction, which would have normally produced methane under > anaerobic conditions, gets oxidised to carbon dioxide in the aerobic phase > itself, so that only the difficult-to-digest part goes into the anaerobic > phase to yield a bit of methane. The figures that I got from a lecture by > Dr. Kale (which I attended about 7 years ago) was that Nisargaruna yielded > only about 1% methane on the basis of the dry weight of the organic matter > introduced into it. After hearing Dr. Kale, I felt that it was too much of > a bother and too much of an expense to get such a low yield of methane. It > might be more economical to have only the aerobic phase, just oxidise the > organic matter into carbon dioxide and water, and to use the water along > with the dissolved mineral components for irrigating plants to save > on fertilizer. > Yours > A.D.Karve > On Tue, May 15, 2012 at 10:44 AM, dav...@kingdombio.co.uk Fulford < > dav...@kingdombio.co.uk> wrote: > >> Dear Aiden Short and listers, >> >> Look at the Nisargruna system developed by BARC in Mumbai (see >> www.barc.ernet.in >> ). There are several groups seeking to commercialise this system in >> India. Dr Kale of BARC can advise you. >> >> Best wishes, >> David F >> >> ******************************************************************** >> Dr David Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5 4PU >> d.j.fulf...@btinternet.com, Tel: +44(0)118 326 9779 Mob: +44(0)7746 >> 806401 >> Kingdom Bioenergy Ltd, www.kingdombio.com, dav...@kindombio.com >> Skype Identity: djfulford >> >> >> ------------------------------ >> *From*: "Aiden Short" <aidensh...@gmail.com> >> *Sent*: 15 May 2012 02:09 >> *To*: digest...@bioenergylists.org >> >> *Subject*: [Digestion] Anaerobic digestion turn key contractors in >> India, preferably Delhi area >> >> >> Hello, >> >> The connection to this list was provided to me by Christian Lohri of >> EAWAG. >> >> I am in the process of designing a 12 TPD Materials Recovery Facility for >> the municipality of Gurgaon, an outskirt of Delhi. I am hoping of treating >> the organic fraction of this waste (an estimated 6 TPD) through anaerobic >> digestion. I am therefore looking for any contractor who may be able to >> work on a design and implementation scheme for an anaerobic digestion plant >> in Gurgaon. It would be preferable if the contractor had experience of >> plants of similar size. >> >> I would be grateful for any assistance you may be able to provide and >> look forward to hearing back from you soon >> >> -- >> Aiden Short >> Technical Adviser >> Chintan Environmental Research and Action Group >> C14 Second Floor >> Lajpat Nagar >> Delhi >> India >> +918445738592 >> >> >> >> _______________________________________________ >> Digestion mailing list >> >> to Send a Message to the list, use the email address >> digest...@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/ >> >> >> > > > -- > *** > Dr. A.D. Karve > Trustee & Founder President, Appropriate Rural Technology Institute (ARTI) > > > > _______________________________________________ > Digestion mailing list > > to Send a Message to the list, use the email address > digest...@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/ > > > -- Aiden Short Technical Adviser Chintan Environmental Research and Action Group C14 Second Floor Lajpat Nagar Delhi India +918445738592
_______________________________________________ Digestion mailing list to Send a Message to the list, use the email address digest...@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/
