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Case Study for Customer Location
CO45:
Reservoir or Lake Use:
Municipal wastewater treatment system, serving 15,000 residents
System Overview and Reservoir:
This is a 4-pond wastewater treatment system: Pond 1 is 2.27
acres, 9.5 ft deep, 5.8 MG capacity, loading is 1,100 lbs of BOD/acre/day,
and has installed 100 hp of diffused aeration operating 24
hrs/day. Pond 2 is 6.0 acres, 10 ft deep, 17.5 MG capacity, and
has installed 60 hp of diffused aeration operating 24 hrs/day.
Pond 3 is 5.7 acres, 10 ft deep, 16.5 MG capacity, has no grid
aeration. Pond 4 is 2.0 acres, 10 ft. deep, 5.3 MG capacity, and
has no grid aeration. Flow rate is 1.5 MGD, with 100% of the
flow first going to Pond 1, then to Pond 2, then to Pond 3, then
to Pond 4. System has controlled periodic discharge; total
system detention time is 30 days. Most critical discharge permit
limits are: 25 mg/L CBOD, 75 mg/L TSS, no ammonia nitrogen
limits.
Reported Problem Before Installation:
High chlorine demand during the summer caused by hydrogen
sulfide production. Effluents also had excessively high algae,
CBOD5, and TSS levels.
Installation:
Date: June 2000, installed one (1) solar-only unit equal to
SB2500 into Pond 3 and one (1) solar-only unit equal to SB2500
into Pond 4.
Results:
Within two summers the maximum chlorine dosage rate applied
decreased by 70%. Plant CBOD5 and TSS levels dropped
significantly and all discharge limits are being met. An
additional benefit has been savings on electrical costs compared
to the grid aerators that were being considered for Ponds 3 and
4 when the solar-powered circulators were purchased. Customer is
very happy with the circulators and how they have improved the
treatment system while reducing chemical costs and eliminating
the need for additional grid aeration and associated energy
costs.
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