[Digestion] Sloping Inlet to overcome calcium particles

[Hoysall Chanakya]

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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