ODOR
REDUCTION
- HOG
FARM
Biological
Treatment
Summary
The
Situation
A major
hog
producer
with
a "Deep-Pit
Barn"
type
waste
collection
system
wanted
to reduce
odors
emanating
from
the
waste
collection
pit
under
the
barn.
The
owner
recognized
that
lower
Ammonia
and
H2S
levels
in the
barn
would
result
in cleaner
air
and
cleaner
air
would
result
in a
healthier
hog.
Facts:
- The
pit
size
was
41'
x
326'
x
8'
[12.5m
x
99.4m
x
2.4m]
- The
pit
will
fill
up
over
11
months
- The
pit
is
pumped
once
per
year
leaving
approximately
75,000
gallons
[284m³]
in
the
pit
- Prior
to
pumping,
the
pit
must
be
mixed
and
agitated
- Weekly
influent
rate
is
10,000
GPW
[37.85m³PW]
- The
facility
is
a
"grow-out"
facility
The
Solution
Bio-Form LLC
developed
an ongoing
biological
treatment
program
utilizing
BZT®
Waste
Digester.
Facts:
- No
bactericides
are
to
be
used
- Temperature
of
liquid
will
remain
between
50-90º
F
[10-32.2°C]
- pH
range
is
6
-
9.
Control:
To ensure
the
results
could
be quantified
a control
barn
was
chosen
to provide
an exact
comparison
but
no treatments
were
made.
The
control
and
treated
barns
had:
- Hogs
with
the
same
genetics
- The
water
supply
supplying
each
barn
was
the
same
- The
quality
of
each
operator
was
rated
to
be
the
same
- All
daily
operations
were
to
be
the
same
- Comparison
of
herd
health
and
harvest
weights
were
to
be
measured
- Comparisons
of
water
depth,
sludge
depth,
sludge
consistency
and
fertilizer
values
were
to
be
completed
Air
quality
measurements
were
conducted
both
inside
and
outside
the
barns
with
ammonia
and
H2S
levels
being
the
principle
measure.
The
Results
Air
quality
greatly
improved
over
the
first
two
months.
This
was
substantiated
by operator
personnel
as well
as the
local
UPS
delivery
man
who
stated
"that
he used
to be
able
to smell
the
site
before
he saw
it,
now
he only
smells
it when
he leaves
his
truck
at the
barn
door."
Approximately
2 ½
months
into
the
agreed
upon
treatment
program,
the
barn
operator
personnel
were
changed
and
the
program
was
interrupted.
The
new
operator
was
not
of the
same
quality
as the
outgoing,
nor
did
he maintain
the
treatment
program
per
the
protocol.
Due
to this
treatment
problem,
the
barn
went
back
to "smells
as usual".
The
first
2 ½
- 3
months,
the
Ammonia
and
H2S
measurements
indicated
improvement
in air
quality.
After
the
program
lapsed
because
of the
operation,
it was
very
difficult
to do
comparisons
due
to the
many
changes
that
occurred.
Upon
completion,
the
study
did
show
a measurable
higher
harvest
weight
for
the
treated
barn
and
sludge
that
did
not
have
to be
mixed
and
agitated
for
pumping.
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