[Digestion] predigestion thread

[David Fulford]

  Listers, including Dr Chanakya and Duncan Martin, Hello,

The aerobic pre-digestion system  that is becoming commercial is the 
Nisargruna system developed by Dr Kale of BARC 
<http://www.barc.ernet.in/akruti-tp/atp_nisar.html> (Bhaba Atomic 
Research Centre), Mumbai, India. One of the groups marketing the system 
is Greentech-Ensys <http://www.green-ensys.org/site/Biogas_Plant.html>  
who provide useful information on the technology on their website. Dr 
Kale has written a paper on the system 
<http://www.scpmaharashtra.com/docs/nisargruna.pdf>.

The system is designed for the organic component of municipal solid 
waste. According to the literature on AD, the first stage, hydrolysis, 
is carried out by facilitative bacteria that can live with or without 
oxygen. Tests that I did many years ago showed that these bacteria will 
grab oxygen from the air in the gas space above the slurry, when a 
biogas plant is started. Thermophyllic aerobic hydrolysis is aggressive 
and breaks down carbohydrates and proteins into soluble fatty acids. If 
the process is stopped after a limited time, the risk of breaking these 
materials completely into carbon dioxide and water should be reduced.

Best wishes,

David F.

On 19/10/2010 15:46, Duncan Martin wrote:
> Good idea. It's not a subject I know much about but I am sure some of 
> our colleagues can help.
>
> Duncan
>
> On 19 October 2010 14:03, Hoysall Chanakya 
> <chanakya at astra.iisc.ernet.in <mailto:chanakya at astra.iisc.ernet.in>> 
> wrote:
>
>     Dear Dr Martin,
>     I wonder if we could pick up the thread where we abruptly left off
>     at the
>     aerobic pre-digestion of agro residues as a possible means to avoid or
>     substitute pretreatment that is required for digesting
>     agro-residues in
>     predominantly liquid digesters - I am sure there would be a wealth of
>     experience and may be direction to head if a lot of NZ and Australian
>     farms are trying to go green and sustainable
>     with best wishes
>     chanakya
>
>
>
>     --
>     Dr. Hoysall Chanakya
>     Centre for Sustainable Technologies
>     (Assoc. Faculty at Centre for Infrastructure, Sustainable
>     Transport and
>     Urban Planning (CiSTUP) and Centre for Contemporary Studies)
>     Indian Institute of Science, Bangalore 560 012
>     ph 91-80-2293 3046; fax-91 80 2360 0683
>
>
>     --
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-- 

********************************************************************
Dr David Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5 4PU
d.j.fulford at btinternet.com <mailto:d.j.fulford at btinternet.com>, Tel: 
+44(0)118 326 9779 Mob: +44(0)7746 806401
Kingdom Bioenergy Ltd, www.kingdombio.com <http://www.kingdombio.com>, 
davidf at kindombio.com <mailto:davidf at kindombio.com>

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