CBPA
Efficacy Test
March 1998
Report Prepared by:
University of Manitoba
Winnipeg, Manitoba
Results and Discussion
Odors
measured downwind of lagoons:
Odor samples were collected approximately 3-4 metres downwind
of the various lagoons. Three commercial products,
CB-PA, ESP Enzyme (ESP) and a Link 2000 product (L-2000) plus
a control lagoon were tested. The testing started
three weeks after the CBPA lagoon (the last lagoon to be
treated) was treated. One treated lagoon was tested against
the control lagoon each week. The odor panel chose the lagoon
with the stronger odor in comparison testing.
The
CBPA treated lagoon was determined by the panel to be lower in
odor compared to the untreated lagoon. The same lagoon (CBPA)
on a subsequent week tested lower than the L-2000 treated
lagoon. The ESP treated lagoon tested stronger than the
control lagoon. Therefore, of the three products tested, the
CB-PA seemed to perform the best in odor abatement.
Odor of air
pumped through liquid samples removed from the lagoons:
The same three treated lagoons were tested using a slightly
different protocol. The top liquid was sampled from three
locations around the lagoon, mixed and 200 ml were placed in a
glass Erlenmeyer flask. Eight litres of air (2 litres/minute
for 4 minutes) was pumped through the manure. The exhausted
air was passed through a plastic cassette containing a swatch
of cotton cloth. The cassettes were compared by a panel as to
which lagoon was stronger in odor. The ESP lagoon was lower in
odor compared to the control.
The
CBPA lagoon was also lower than the control lagoon and lower
than the L-2000 lagoon.
Intensity of
lagoon odors compared to a butanol numerical scale:
The odorous downwind lagoon air (Table 1.) was ranked by the
odor-testing panel to standard butanol samples ranging in
concentration from 0 to 5000 ppm similar to the procedures of
Williams and Schiffman (1996). Due to the protocol set up only
a few samples were tested on the numerical butanol scale.
These samples were collected on different days under various
environmental conditions. The measurements, however, seemed to
be consistent from day to day and between replicate sampling.
The numerical values for the CB-PA lagoon and the L-2000
lagoon compared lower than the FSP treated lagoon which
supports the previous comparison testing.
The
value of the CB-PA lagoon was 2.44 butanol units which were
approximately 50% of the average control lagoon values of
5.46. Again these studies seem to indicate the effectiveness
of the CBPA material.
Full Report
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