[Digestion] Use of centrifugal pump for transferring feedstock into digester

[Anand Karve]

Dear Dr. Fulford,
thanks a lot for the explanation and the solution.
Yours
A.D.Karve

On Sun, Nov 17, 2013 at 12:45 AM, David <davidf at kingdombio.com> wrote:

>  Dr Karve and listers, Hello,
>
> Tests I tried in a laboratory which involved pumping material into a
> digester suggested that flow velocity is important. The microbes do not
> seem to like being accelerated, and stop working. A centrifugal pump works
> by accelerating the fluid, so is not really suitable for use in an
> anaerobic digester. The type of pump most often used is a progressive
> cavity pump, although an archimedes screw is also good.
>
> Unfortunately, the project was not properly written up, mainly because it
> did not produce biogas. I did try to write a patent on the idea, but as it
> did not work, it became rather pointless.
>
> Best wishes,
> David
> *davidf at kingdombio.com* <davidf at kingdombio.com>
>
>  ******************************************************
> Dr David Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5 4PU
>        Tel: +44(0)118 969 5039 Mob: +44(0)7746 806401
> Kingdom Bioenergy Ltd, *www.kingdombio.com* <http://www.kingdombio.com/>,
> *davidf at kindombio.com* <davidf at kindombio.com>
>                                 Skype Identity: djfulford
>
>
>
> ------ Original Message ------
> From: "Anand Karve" <adkarve at gmail.com>
> To: "For Discussion of Anaerobic Digestion" <
> digestion at lists.bioenergylists.org>
> Sent: 16/11/2013 07:35:15
> Subject: Re: [Digestion] Use of centrifugal pump for transferring
> feedstock into digester
>
>  Dear Marc,
> the feedstock is going into the digester all right. So obstruction in the
> feed line is not the problem.
> Yours
> A.D.Karve
>
>
> On Sat, Nov 16, 2013 at 8:04 AM, Marc de Piolenc <piolenc at archivale.com>wrote:
>
>> There are at least two other possibilities
>>
>> - cavitation within the pump leading to loss of "prime"; this is heavily
>> dependent on where the pump is installed, bends and constriction in the
>> feed line and so on
>>
>> - formation of gas bubbles in the feed; why wouldn't fermentation start
>> in the feed, given the right conditions? Those gas bubbles will act just
>> like water vapor (cavitation) or air intrusion, and make the pump lose its
>> "prime."
>>
>> The usual remedy is installing a manual, reciprocating pump in line with
>> the centrifugal pump. This is used for initially priming the centrifugal
>> pump and for re-priming it if it gets gas-locked or "sucks dry." Whether
>> this will work with a relatively thick slurry or not, I don't know.
>>
>> Marc de Piolenc
>> --
>> Archivale catalog: http://www.archivale.com/catalog
>> Polymath weblog: http://www.archivale.com/weblog
>> Translations (ProZ profile): http://www.proz.com/profile/639380
>> Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc
>> Ducted fans: http://massflow.archivale.com/
>>
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>> 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)
>
>
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> 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)
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