[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.



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)


Message: 1

Date: Tue, 5 Oct 2010 09:55:33 +0300

From: Edward Matos 

To: , "'For Discussion of Anaerobic


Subject: Re: [Digestion] More scientific based research and questions


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?







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




 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



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Message: 2

Date: Tue, 5 Oct 2010 15:02:03 +0800

From: "william" 


Subject: [Digestion] Digestion Digest, Vol 2, Issue 14


Content-Type: text/plain; format=flowed; charset="iso-8859-1";


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 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


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.



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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)


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.



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