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| Digestion Archive for February 2000 |
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| 149 messages, last added Tue Nov 26 17:15:12 2002 |
[Date Index][Thread Index]
Re: DIG-L: Re:'Understanding Anaerobic Treatment' -longishmessage
Dear Holger,
I really must be getting old to make such stupid typing errors. Of course, acetogenic microorganisms, as they produce acetate from volatile fatty acids.
Well, I thought I clearly said below that there are 4 different phases in anaerobic digestion. If you do not agree with my description of 4 different phases being 4 different groups of microorganisms, then I cannot help your misinterpretation of my English.
Unfortunately, a lot of disputes come from such misunderstandings and I hope that we two are not in that category. In order to confirm what I am saying, you can easily read my books on Bacterial Metabolism [Academic Press] and the latest book on Microbial Process Development [World Scientific Publ., Singapore] as evidence.
Kindest regards
Horst
At 11:28 21/02/00 +0100, you wrote:
>Dear Horst!
>
>I do not agree that you 'separated clearly acetogens from methanogens'.
>
>The third group of microorganisms of the anaerobic nutrient chain might
>correspond to 1c) of your outline. In this section, you describe the
>role of acidogenic microorganisms. Isn't it acetogenic microorganisms?
>
>Best regards,
>
>Holger.
>
>doelle wrote:
>
>> If read my outline correctly, I have seprataed clearly acetogens from methanogens. I stated the third group as acetogens and the fourth group of microorganisms as methanogens.
>
>>> 1. Anaerobic digestion has 4 different types of phases:
>>> a) liquefaction, where the polymers are degraded into monomers
>>> b) fermentation, whereby fermentative microorganisms convert all the monomers into >> CO2, and volatile fatty acids. In this process, carbohydrates are converted into >> acetate and CO2 and H2, whereas the proteins and fats are forming predominantly
>>> the higher volatile fatty acids.
>>> c) the acidogenic microorganisms are those, which convert the higher volatile
>>> fatty acids into acetate and CO2 and H2
>>> d) the methanogenic phase, whereby the methanogenic bacteria convert the acetate, >> CO2 and H2 into methane and CO2.
>
>
Horst W.Doelle, D.Sc., D.Sc. [h.c.]
Chairman, IOBB
Director, MIRCEN-Biotechnology
FAX: +617-38783230
Email: doelle@ozemail.com.au DIGESTION List Sponsors, Archive and Information http://www.crest.org/renewables/digestion-list-archive http://www.crest.org/renewables/biomass-info/ Beginners Tour of Biogas http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners
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