[Digestion] Digestion Digest, Vol 14, Issue 3

Jonathan Clouston geniusp at tpg.com.au
Fri Oct 7 02:02:08 CDT 2011 

Remember that the glycerol by-product of biodiesel production is excellent digester food 

regards
J Clouston

On 06/10/2011, at 6:00 AM, digestion-request at lists.bioenergylists.org wrote:

> Send Digestion mailing list submissions to
> 	digestion at lists.bioenergylists.org
> 
> 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
> 	digestion-request at lists.bioenergylists.org
> 
> You can reach the person managing the list at
> 	digestion-owner at lists.bioenergylists.org
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Digestion digest..."
> 
> 
> Today's Topics:
> 
>   1. biogas from restaurant oil & food waste (Wayne Zschech)
>   2. R:  biogas from restaurant oil & food waste
>      (Ing. Alessandro Francese)
>   3. Re: biogas from restaurant oil & food waste (Anand Karve)
>   4. Re: biogas from restaurant oil & food waste (Anand Karve)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 5 Oct 2011 10:47:25 +0300
> From: Wayne Zschech <waynezschech at calvarychapel.com>
> To: digestion at lists.bioenergylists.org
> Subject: [Digestion] biogas from restaurant oil & food waste
> Message-ID:
> 	<CAODnONMzm9o66vDgE7j=dyHO_QAmAgFFdc5hiic_g6obA52b8g at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> G'day All!
> 
> The waste vegetable oil we collect from the restaurants has up about 10-12%
> water and food waste in it.  We heat the oil up to 65oC and then drop this
> 'soup' out from the bottom.  We want to utilize this waste about 1,5-2,0
> tonnes per month as a feedstock for biogas production.  We also end up with
> about 500kg of rancid fats/oils that we can't use for biodiesel production.
> 
> I understand that both the soup and the rancid fats should be able to give
> me lots of gas but don't know how to calculate the needed reactor volume.
> I'm also concerned that the fat will float at the top of the reactor and
> cause problems. Could anyone give some reactor design tips for these
> feedstocks?
> 
> Also is it possible to produce a digestate that can be used as animal feed
> or feed supplement?  from this waste? from restaurant food waste in
> general?  We have long winters and I don't want to have to store the
> digestate as fertilizers for many months if I can produce a product local
> pig farmers can use.  It has been suggested that I should make batch type
> reactors so as to be sure that all the organics have been digested before
> 'packaging' or storing it.  Are pathogens likely to be a problem?  Should I
> consider thermophilic temperatures? I've read that heating such waste to
> 70oC for 1 hour is the industry standard.
> 
> What other problems can I expect to encounter.
> 
> Any input would be appreciated.
> Many blessings,
> Wayne
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20111005/6f6f967b/attachment-0001.html>
> 
> ------------------------------
> 
> Message: 2
> Date: Wed, 5 Oct 2011 10:13:18 +0200
> From: "Ing. Alessandro Francese" <francese at fauser.it>
> To: "'For Discussion of Anaerobic Digestion'"
> 	<digestion at lists.bioenergylists.org>
> Subject: [Digestion] R:  biogas from restaurant oil & food waste
> Message-ID: <017601cc8336$a3cdfc00$eb69f400$@it>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Wayne,
> 
> why would you transform oil and fat into biogas when you can burn its
> directly in commercial gensets to produce electrical energy( efficiency
> 36/38%)?
> 
> Alessandro Francese
> 
> 
> 
> Da: digestion-bounces at lists.bioenergylists.org
> [mailto:digestion-bounces at lists.bioenergylists.org] Per conto di Wayne
> Zschech
> Inviato: mercoled? 5 ottobre 2011 9.47
> A: digestion at lists.bioenergylists.org
> Oggetto: [Digestion] biogas from restaurant oil & food waste
> 
> 
> 
> G'day All!
> 
> The waste vegetable oil we collect from the restaurants has up about 10-12%
> water and food waste in it.  We heat the oil up to 65oC and then drop this
> 'soup' out from the bottom.  We want to utilize this waste about 1,5-2,0
> tonnes per month as a feedstock for biogas production.  We also end up with
> about 500kg of rancid fats/oils that we can't use for biodiesel production.
> 
> I understand that both the soup and the rancid fats should be able to give
> me lots of gas but don't know how to calculate the needed reactor volume.
> I'm also concerned that the fat will float at the top of the reactor and
> cause problems. Could anyone give some reactor design tips for these
> feedstocks? 
> 
> Also is it possible to produce a digestate that can be used as animal feed
> or feed supplement?  from this waste? from restaurant food waste in general?
> We have long winters and I don't want to have to store the digestate as
> fertilizers for many months if I can produce a product local pig farmers can
> use.  It has been suggested that I should make batch type reactors so as to
> be sure that all the organics have been digested before 'packaging' or
> storing it.  Are pathogens likely to be a problem?  Should I consider
> thermophilic temperatures? I've read that heating such waste to 70oC for 1
> hour is the industry standard.
> 
> What other problems can I expect to encounter. 
> 
> Any input would be appreciated.
> Many blessings,
> Wayne
> 
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20111005/81f887c8/attachment-0001.html>
> 
> ------------------------------
> 
> Message: 3
> Date: Wed, 5 Oct 2011 22:38:38 +0800
> From: Anand Karve <adkarve at gmail.com>
> To: For Discussion of Anaerobic Digestion
> 	<digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] biogas from restaurant oil & food waste
> Message-ID:
> 	<CACPy7SfArbBKG5VQCui=9fS9Zm1Zbon5VUZpuoAa7vHhG1PD3w at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Dear Mr.Zschech,
> any biogas plant would be able to accept the fatty material as
> feedstock. You may have to conduct some experiments to determine the
> quantity to be introduced daily. Castor beans, for instance, contain
> about 50% oil. We have been able to use about 1g macerated castor
> beans per litre of digester capacity in our ARTI biogas system, which
> yielded  A biogas plant is an open system, which harbours different
> kinds of micro-organisms. If you introduced more  feedstock than the
> optimum quantity, the unused feedstock would be consumed by the other
> organisms. If they are allowed to multiply their numbers, the system
> suffers a break down. A biogas plant is also susceptible to
> temperature. When it is cold, the gas production gets reduced. Novices
> feel that they should increase the feedstock quantity in order to get
> more gas. But that is a wrong notion. Low biogas production under cool
> temperature means that the organisms are eating less. One should
> therefore reduce the feedstock quantity proportionately.
> Yours
> A.D.Karve
> 
> On Wed, Oct 5, 2011 at 3:47 PM, Wayne Zschech
> <waynezschech at calvarychapel.com> wrote:
>> G'day All!
>> 
>> The waste vegetable oil we collect from the restaurants has up about 10-12%
>> water and food waste in it.? We heat the oil up to 65oC and then drop this
>> 'soup' out from the bottom.? We want to utilize this waste about 1,5-2,0
>> tonnes per month as a feedstock for biogas production.? We also end up with
>> about 500kg of rancid fats/oils that we can't use for biodiesel production.
>> 
>> I understand that both the soup and the rancid fats should be able to give
>> me lots of gas but don't know how to calculate the needed reactor volume.
>> I'm also concerned that the fat will float at the top of the reactor and
>> cause problems. Could anyone give some reactor design tips for these
>> feedstocks?
>> 
>> Also is it possible to produce a digestate that can be used as animal feed
>> or feed supplement?? from this waste? from restaurant food waste in
>> general?? We have long winters and I don't want to have to store the
>> digestate as fertilizers for many months if I can produce a product local
>> pig farmers can use.? It has been suggested that I should make batch type
>> reactors so as to be sure that all the organics have been digested before
>> 'packaging' or storing it.? Are pathogens likely to be a problem?? Should I
>> consider thermophilic temperatures? I've read that heating such waste to
>> 70oC for 1 hour is the industry standard.
>> 
>> What other problems can I expect to encounter.
>> 
>> Any input would be appreciated.
>> Many blessings,
>> Wayne
>> 
>> _______________________________________________
>> Digestion mailing list
>> 
>> to Send a Message to the list, use the email address
>> Digestion at bioenergylists.org
>> 
>> to UNSUBSCRIBE or Change your List Settings use the web page
>> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>> 
>> 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)
> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Wed, 5 Oct 2011 22:42:26 +0800
> From: Anand Karve <adkarve at gmail.com>
> To: For Discussion of Anaerobic Digestion
> 	<digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] biogas from restaurant oil & food waste
> Message-ID:
> 	<CACPy7SemnYxOOSOGXQvqbjazbFsb5QnypqeisdnT42WnF4aJ=w at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> sorry, my message got sent before I could do proof reading. I complete
> the sentence about yield of biogas from castor beans. 1 g macerated
> castor beans yielded about 800ml biogas.
> Yours
> A.D.Karve
> 
> On Wed, Oct 5, 2011 at 3:47 PM, Wayne Zschech
> <waynezschech at calvarychapel.com> wrote:
>> G'day All!
>> 
>> The waste vegetable oil we collect from the restaurants has up about 10-12%
>> water and food waste in it.? We heat the oil up to 65oC and then drop this
>> 'soup' out from the bottom.? We want to utilize this waste about 1,5-2,0
>> tonnes per month as a feedstock for biogas production.? We also end up with
>> about 500kg of rancid fats/oils that we can't use for biodiesel production.
>> 
>> I understand that both the soup and the rancid fats should be able to give
>> me lots of gas but don't know how to calculate the needed reactor volume.
>> I'm also concerned that the fat will float at the top of the reactor and
>> cause problems. Could anyone give some reactor design tips for these
>> feedstocks?
>> 
>> Also is it possible to produce a digestate that can be used as animal feed
>> or feed supplement?? from this waste? from restaurant food waste in
>> general?? We have long winters and I don't want to have to store the
>> digestate as fertilizers for many months if I can produce a product local
>> pig farmers can use.? It has been suggested that I should make batch type
>> reactors so as to be sure that all the organics have been digested before
>> 'packaging' or storing it.? Are pathogens likely to be a problem?? Should I
>> consider thermophilic temperatures? I've read that heating such waste to
>> 70oC for 1 hour is the industry standard.
>> 
>> What other problems can I expect to encounter.
>> 
>> Any input would be appreciated.
>> Many blessings,
>> Wayne
>> 
>> _______________________________________________
>> Digestion mailing list
>> 
>> to Send a Message to the list, use the email address
>> Digestion at bioenergylists.org
>> 
>> to UNSUBSCRIBE or Change your List Settings use the web page
>> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>> 
>> 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)
> 
> 
> 
> ------------------------------
> 
> _______________________________________________
> Digestion mailing list
> 
> to Send a Message to the list, use the email address
> Digestion at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
> 
> 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/
> 
> 
> 
> End of Digestion Digest, Vol 14, Issue 3
> ****************************************
>

More information about the Digestion mailing list