[Digestion] Digestion Digest, Vol 13, Issue 3

Rolf Uhle energiesnaturals at gmx.de
Sat Sep 24 17:44:34 CDT 2011


Hallo all,

yes, I tried it last summer.
I chopped fresh, green Arundo into 2cm chips and soaked it in water.
Joghurt and sour milk was added and the mash went down to ph 4 if I remember 
well.
 Before that i had prepared some starter from our septic tank, deep below a 
thick swimming layer.
It develloped Methane all right, i could burn it.
The soaked , probably hydrolized Arundo went into a plastic tank and was kept 
at around 28 °C for weeks.
Ignitable methane develloped , but not  to the extend expected.
After the reaction ceased, I opened the tank and found the substrate virtually 
undigested, I mean in it's original form.
Stem particles looked like stem particles and the rests of leaves were clearly 
distiguished.
I did not quantify the yield, bur compared to othersubstartes it seemed poor 
to me, probably due to a high lignin %.

It has been like that for more than a year now, with temperature varying with 
the seasons.
If anybody was interested, I could check again and find out what it looks like 
now.

This crude experiment somehow discouraged me to carry on with AD of Arundo.

Rolf





Am Samstag, 24. September 2011 21:00:04 schrieb digestion-
request at lists.bioenergylists.org:
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>    1. Re: Giant reed (arundo donax) digestion
>       (Jacopo Rosselli Del Turco)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 24 Sep 2011 07:15:10 +0000
> From: "Jacopo Rosselli Del Turco" <jrdt at interfree.it>
> To: "For Discussion of Anaerobic Digestion"
> 	<digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Giant reed (arundo donax) digestion
> Message-ID:
> 	<376381181-1316848571-cardhu_decombobulator_blackberry.rim.net-1104926706-
> @b13.c7.bise7.blackberry>
> 
> Content-Type: text/plain
> 
> Thanks Les for your interesting observations.
> I never thought of siloxanes but you're probably right.
> Anyway I think it's a quite innovative biomass to use for digestion.
> If anybody know something about its use in anaerobic digestion, please let
>  me know. Best regards!
> 
> Jacopo Rosselli Del Turco
> 
> -----Original Message-----
> From: Les Gornall <Les.Gornall at projen.co.uk>
> Sender: digestion-bounces at lists.bioenergylists.org
> Date: Fri, 23 Sep 2011 18:19:05
> To: <jross07 at gmail.com><jross07 at gmail.com>; For Discussion of
>  AnaerobicDigestion<digestion at lists.bioenergylists.org> Reply-To: For
>  Discussion of Anaerobic Digestion
> 	<digestion at lists.bioenergylists.org>
> Cc: digestion at lists.bioenergylists.org<digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Giant reed (arundo donax) digestion
> 
> Good question!  The reed is unique in it's ability to lock silicon into its
>  stem tissues.  That's why it is used for making oboe reeds.  When digested
>  the silicone would most likely be expresses as siloxanes in the Biogas. 
>  But I have not seen any data.  Good research project for someone.  I would
>  think phragmites Australis would be a better bet.  You can grow the latter
>  in a reed bed on the final effluent. The resulting effluent would be
>  crystal clear and the productivity of the reed bed very high.  Hmmmmm :-).
> 
> 
> Les. Gornall
> 
> 
> On 23 Sep 2011, at 18:51, "jrdt at interfree.it<mailto:jrdt at interfree.it>"
>  <jrdt at interfree.it<mailto:jrdt at interfree.it>> wrote:
> 
> Good evening everybody,
> I would like to know if you know about any biogas plant running on
>  codigestion of arundo donax (giant reed). If yes, in what percentage? What
>  are the other substrates? What kind of pretreatment is required? Thank you
>  very much in advance,
> best regards.
> 
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> End of Digestion Digest, Vol 13, Issue 3
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