[Digestion] Digestion Digest, Vol 33, Issue 12

[Rabin Shrestha]

Dear Dr. Hoysall Chanakya,

Thank you for your suggestions. I will also have a look into the design of
floating biogas plant. If possible can you also provide the link for design
of the floating biogas plant. 

Thank you again.

Regards,
Rabin Shrestha 

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Subject: Digestion Digest, Vol 33, Issue 12

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Today's Topics:

   1. Need suggestions (Rabin Shrestha)
   2. Sloping Inlet to overcome calcium particles (Hoysall Chanakya)


----------------------------------------------------------------------

Message: 1
Date: Fri, 31 May 2013 11:35:48 +0545
From: "Rabin Shrestha" <rshrestha at winrock.org.np>
To: <digestion at lists.bioenergylists.org>
Subject: [Digestion] Need suggestions
Message-ID: <000001ce5dc2$cd737ea0$685a7be0$@org.np>
Content-Type: text/plain;	charset="us-ascii"

Dear All, 

I am writing this email to ask for advice about a problem which I
encountered in a Fixed dome biogas plant. In Nepal, we are trying to use
fixed dome biogas plant for generating energy from poultry waste. But during
the process we encountered some problems like there is deposition of calcium
carbonate (marble chips).In the poultry farms, the birds are fed with
calcium carbonate (CaCo3) or marble mixed with the food materials to help in
the digestion process. About 60% of these fed marbles comes out directly
through litter. The use of fresh litter directly as feeding material for
digester creates problem of siltation or deposition. This lead to the
non-functioning biogas plant. 

Can you suggest any solution for this problem? Is there any process to
remove calcium carbonate that we can use before feeding the poultry waste in
the digester? 

I would really appreciate your help. 

Thank you. 

Regards,
Rabin Shrestha





------------------------------

Message: 2
Date: Fri, 31 May 2013 19:00:36 +0530 (IST)
From: "Hoysall Chanakya" <chanakya at astra.iisc.ernet.in>
To: "For Discussion of Anaerobic Digestion"
	<digestion at lists.bioenergylists.org>
Subject: [Digestion] Sloping Inlet to overcome calcium particles
Message-ID:
	<41503.10.16.40.14.1370007036.squirrel at mail.astra.iisc.ernet.in>
Content-Type: text/plain;charset=iso-8859-1

Dear Rabin Shreshta
The answer usd to be simple in Bangalore and nearby places.  The poultry
wastes was diluted 1:1 with water or a little more dilute like it is done
with cattle dung.  Instead of feeding it immediately it is held for a
couple of hours in the inlet tank.  The CaCO3, either as broken egg shells
or marble grit, settled down.  The supernatant layer is only fed to the
biogas plant.  Please see the typical inlet design of an old floating drum
KVIC design of the '80s.  This will help you solve this problem.  The
inlet design of the Indian Biogas plant was similarly made to exclude sand
particles that came from dung collected as droppings on open land.

This worked very well in field plant using cattle dung and sand and soil
particles were an impurity that we could never avoid in the feedstock. 
This above inlet design helped us overcome the filling up of hte biogas
plant with sand and we could operate for over 10 years without
interruption from this problem.

I believe this will solve your problem too.  Do inform either way.
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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End of Digestion Digest, Vol 33, Issue 12
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