report produced by Ralph G. Winfield & Assoc., RR#1, Belmont, Ontario, N0L 1B0
January 1986.
The primary objective of this report is to bring together and evaluate
the on-farm experience of anaerobic digester users in Canada.
The second objective is to recomment further research or field
experimentation that should be undertaken to enhance or encourage
anaerobic digester system designs for, or on Canadian farms. Economic
viability must be the ultimate criterion upon' which installation is
based.
Bassed on the vists to farms and discussions with operatiof there is no
doubt that anaerobic digestion of animal manure does indeed reduce
odours. That in itself is a very positive factor in continuing the
effort to develop on-farm digester technology. Unfortunately odour
control offers no directly measureably financial incentive for an
animal producer to spend even 20 to 50 thousand dollars.
If anaerobic digestion is to be an interal part of animal production
facilities some other benefit or some other interes group must provide
the financial incentive. The on-farm benefits result been percieved to
be in two categories: direct energy as a result of effectively using
biogas; and savings by refeeding a portion of the digester effluent.
There is no doubt that the construction of a digester unit and
separation equipment necessary to recover protein for livestock feed is
not feasibly if the major purpose is to recover protein. Evidence
appears sufficient to suggest that the obtainable protein supplement
will not satisfactorily replace most of the protein in beef, dairy or
swine rotations.
Total anaerobic digestion systems including cogeneration and/or
recovery facilities can be capital intensive. Most systems visited have
been designed for relatively large animal population units. One could
cost them on a per animal basis but that cost is not proportional.
Researchers, designers and users all agree that scaled down units are
neigher practical nor possible (economically) with present designs.
Root / Canadian Biogas Projects
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