Dear Paul You are absolutely correct. I am in this field from 1979. All I learnt was that the Biogas owner must have her conveniences of Input of water and dung in right proportion. In Kerala latex has been a bliss in disguise for Biogas production.
Regards -Krishna On Tue, 05 Oct 2010 17:26:11 +0530 wrote >Send Digestion mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Digestion digest..." Today's Topics: 1. Re: More scientific based research and questions (Edward Matos) 2. Digestion Digest, Vol 2, Issue 14 (william) 3. 1. Re: Inoculation for Small Digesters (P M Allison) 4. Re: (no subject) (Igor ?krjanec) ---------------------------------------------------------------------- Message: 1 Date: Tue, 5 Oct 2010 09:55:33 +0300 From: Edward Matos To: , "'For Discussion of Anaerobic Digestion'" Subject: Re: [Digestion] More scientific based research and questions Message-ID: Content-Type: text/plain; charset="us-ascii" Dear Paul, A comprehensive summary of the state of the art - thank you. I'm afraid I didn't receive the "interesting paper" you attached. Please could you send a link, or the title+authour+year? Regards, Ed From: [email protected] [mailto:[email protected]] On Behalf Of Paul Harris Sent: 05 October 2010 04:10 To: 'For Discussion of Anaerobic Digestion' Subject: [Digestion] More scientific based research and questions Sir, Greetings.... I have been seeing many queries posed by many persons, I do not understand where these persons are from, or what work is done at the feild level, so many theories projected, I have been in this feild for 30 odd yrs, in a normal system u use cowdung/manure as the main feed substarte, and we have been following this very closely, any amount of manipulation does not help, we have seen number of biogas plants fail to produce gas after overloading..with unwanted chemicals/ biological products particularly when the temp in fall of the year, there is not much u can do, but try save the heat loss by insulation,which is very pratical when temp falls below 10 degrees. I wish to share my little knowledge and experience Methane is one of final product, and its production is based on the avialbility of Hydrogen based compounds, we have seen the addation of oil seed cake, we use mostly cakes which are not utilised for cattle, castor cake, Jatropha, sopilt oil seed cake, ground nut, waste cooking oil, if used in a small qty, it can keep producing biogas of higher quality, I do not want to indulge in the information which is known, the various process of anaerobic digestion....when a new product is introduced, it must be introduced gradually in small quantity,,,,, I have been using coffee husk C:N (1:23) better than cattle dung which is approx (1:30),,,, one of the problem we face is higher production of H2S(hydrogen sulphide) , on the other hand we have recently seen more farmers are now using the waste water from the rubber sheet (latex is collected, made to cogulate by adding formic acid) after 3 hrs, the cogulated latex slab is made to pass through steel rollers, which removes the liquid portion, which is rich in sugars and carbohydrates, they are use for feeding the biogas plants, there is no need of dung, though initially these were solely dung fed bioas plants....I do not have much understanding of the microbiology...but it works, it does not cost the farmer anything, it has become a blessing in disguise ,for many years, it was a nuisance, until someone discovered the potential of this waste water. Methane production can also be increased, by providing the methonabactera with right amount of nutrients, these are trace elements, they need in small qty, of which, ferrous (iron) cobalt, nickel, molybendum....these quantity needs to be added monthly, or when the gas production (methane) falls.....from my experience from the field, this technology has been staright jackted with the usage of animal manure....all the while the research consideration was on C:N ...thus when higher protein products were used, or if the product is much more than organic/ compound, system fail.... Only recently a new line of research is taking place, looking closely on hydrogenated compounds (C:H), that is where oil seed cake is found to be a good product, a safe candidate for increasing Methane .....waste food have good potential, because of more hydrogen products, like fats and oil....now waste management have adopted this product..... Most of the installed biogas plant at family level fails for number of reason, on of the main ones, is lack feed material and water, both are closely linked ....see this in perspective, the Indian Insitute of Science, Bangalore's rural energy wing - Centre for science and technology have developed a a new design called Plug Flow...it take care to over come many of the problems associated, as the feed material is mostly biomass in their native state, always thought that methane production take place only when biomass is submerged in water, no it is not necessary, as as long as biomass is confined to a close place /devoid of air methane will be generated, best example in nature is the termite ,they consume all the cellulose material, certain type of bacteria in their guts, break the cellulose down with enzyme, producing host material, .......... Below is an interesting paper attached..... For Dhanesh Kumar [[email protected]] Mr. Paul Harris, Room S116b, Waite Main Building Faculty of Sciences, The University of Adelaide, Waite Campus, PMB 1, Glen Osmond SA 5064 Ph : +61 8 8303 7880 Fax :+61 8 8303 4386 mailto:[email protected] http://www.adelaide.edu.au/directory/paul.harris CRICOS Provider Number 00123M This email message is intended only for the addressee(s) and contains information that may be confidential and/or copyright. If you are not the intended recipient please notify the sender by reply email and immediately delete this email. Use, disclosure or reproduction of this email by anyone other than the intended recipient(s) is strictly prohibited. No representation is made that this email or any attachments are free of viruses. Virus scanning is recommended and is the responsibility of the recipient. -------------- next part -------------- An HTML attachment was scrubbed... URL: ------------------------------ Message: 2 Date: Tue, 5 Oct 2010 15:02:03 +0800 From: "william" To: Subject: [Digestion] Digestion Digest, Vol 2, Issue 14 Message-ID: Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Dear Ron, I'm working on a proposal for MSW plant for 250 Ton per day, it is funded by the local government, can you give me a proposal? William SP MULTITECH RENEWABLE ENERGY S/B [email protected] ------------------------------ Message: 3 Date: Mon, 4 Oct 2010 22:56:11 +1100 From: "P M Allison" To: "digestion" Subject: [Digestion] 1. Re: Inoculation for Small Digesters Message-ID: Content-Type: text/plain; charset="us-ascii" For an excellent AD starter culture I have used the contents of a freshly slaughtered cow's stomach, preferably the first unit which contains the methano-bacteria, rather than the others. I have also trialed septic tank biological cultures in dried and pelleted forms as long as anaerobes are part of the cultural mix. Peter. ____________________________________ Digestion mailing list [email protected] http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org Beginner's Guide to Biogas http://www.adelaide.edu.au/biogas/ Biogas Wiki http://biogas.wikispaces.com/ http://info.bioenergylists.org ------------------------------ Message: 4 Date: Tue, 05 Oct 2010 13:55:26 +0200 From: Igor ?krjanec To: For Discussion of Anaerobic Digestion Subject: Re: [Digestion] (no subject) Message-ID: Content-Type: text/plain; charset="windows-1252"; Format="flowed" Na 4.10.2010 20:15, Arturo ?valos je pisal: > > Hello all > > Does someone know something about use ferric chloride to reduce the > sulfur content in the biogas? > > Thanks for the information > > / / > > Arturo > > > _______________________________________________ > Digestion mailing list > [email protected] > http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org Hallo Arturo Ferric chloride is normally use for a neutralizations of H_2 S. Hydrogen sulfide is slightly soluble in water and acts as a weak acid , because of this is harmful for a CHP unit. H_2 S is a product of sulfate-reducing bacteria which are also present in biogas reactor. Sulfate-reducing bacteria use present sulfats from substrates to oxidize the organic matter. Hydrogen sulfide reacts with metal ions to form metal sulfides (H_2 S + FeCl_2 ? FeS + 2 HCl). Iron sulfide is not soluble and it is not problematic for a biogas process and CHP unit. When biogas plant works normally hydrogen sulfide is not problematic, because of its oxidation with aerobic bacteria to elementary sulphur. Bye Igor -------------- next part -------------- An HTML attachment was scrubbed... URL: ------------------------------ _______________________________________________ Digestion mailing list [email protected] http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org End of Digestion Digest, Vol 2, Issue 14 ****************************************
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