[Digestion] Digestion Digest, Vol 2, Issue 14

Choppalli Venkata Krishna krishnacreat1 at rediffmail.com
Wed Oct 6 22:20:43 PDT 2010


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

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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)











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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: digestion-bounces at lists.bioenergylists.org



[mailto:digestion-bounces at lists.bioenergylists.org] 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 [daquab4u at gmail.com]







 







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:paul.harris at adelaide.edu.au



http://www.adelaide.edu.au/directory/paul.harris







 







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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



william at spmultitech.com



















------------------------------







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. 



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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



> Digestion at lists.bioenergylists.org



> 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







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