Report 1-933 - P. Van Die, Research Branch, Agriculture Canada, Engineering and Statistical Research Centre. May 1987
Anaerobic digestion technology was taken from the laboratory and
developped at the pilot and farm-scale levels over a thirteen year
period through the departments' contracting-out program. Utilization of
methane for space heating, electrical generation and mobile power were
the main energy aspects examined. This was supplemented with work on
reducing the pollution potential of manure and food processing waste
disposal and on protein and nutrient recovery for refeeding. Emphasis
was initially given to the study of anaerobic digestion rather than
designing systems for agriculture.
Full scale digesters were then designed, constructed, operated and
monitored at the mesophyllic temperature range of 20 to 45° on several
swine, beef and dairy operations. It was found that anerobic digesters
can be operated year round in Canada's cold climate and the biogas
produced ir produced can be readily used for space heating or
generating electricity. Sufficient biogas is produced to provide
supplemental head to maintain the digestion process in winter and for a
farm to be almost self-sufficient in the production of electricity,
especially if the peak electrical demand loads can be reduced.
The recovery of protein was one of the main justifications for
continuing the program as it was for redeeding animals obvious that
energy alone could not justify farm scale anaerobic digestion. The
protein aspects fell short of expectations. It is a low value protein
and refeeding resulted in reduced animal feed intake and reduced rate
of gain or production.
Overall, good attempt was made in applying and evaluation
anaerobic digestion technology for Canadian agriculture. A definite
reduction in odour was observed with digested manure and anaerobic
digestion should be considered as one of the treatment techniques when
odour control or reduction is critical to the economics of large scale
operations.
Root / Canadian Biogas Projects
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