PoultryUSA - November 2017 - 8
8 ❙ WATTPoultryUSA
PLANT WINS AWARD
convert ammonia to nitrate. A portion of the mixed liquor suspended
solids (MLSS) or bacteria wasted is
returned to low dissolved oxygen or
anoxic zones at the beginning of the
basins so that nitrate and remaining BOD are removed. A second
chemical DAF unit provides a small
footprint to clarify any remaining
suspended solids (TSS) from the
discharged water, adding to the consistency in operational performance.
The overall process provides an
impressive 99 percent removal of its
permitted loadings for TBOD and ammonia-nitrogen, with oil and grease
typically below detection levels. TKN
is usually 90 percent below permitted
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Treated effluent from the second
dissolved air flotation unit that
is discharged to the local water
reclamation facility. | John Pierson
limits. Only monitoring is required
for TP and TSS as these remain well
within concentrations the local public
water reclamation plant can handle.
Waste solids from the primary
DAF unit are sent to a vertical holding
tank for improved dewatering. These
primary solids are combined with the
waste activated sludge for beneficial reuse in land application. Since opening
in 2009, more than 4 million gallons
of nutrient-rich solids from the facility
were applied by a contracted agent and
more than 3 million pounds of waste
meat were screened and recycled.
Energy saving throughout the
process come from variable frequency
drive (VFD) pumps controlling influent feed rates, aeration blower operations flexibility afforded by the dual
basin setup, and axial submersible
mixers efficiently transferring wastewater between aerobic and anoxic
zones. Average water consumption
was reduced by more than 200,000
gallons per day through improved
training and refining operations such
as steam for selected sanitation procedures and reusing rooftop refrigeration
condensation in vacuum pumps.
www.WATTAgNet.com ❙ November 2017