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 SolarBees were purchased. Customer is very happy with the SolarBees and how they have improved the treatment system while reducing chemical costs and eliminating the need for additional grid
aeration and associated energy costs.
Updated: 03/06/2007
SolarBee, Inc. (formerly a division of Pump Systems, Inc.) developed, manufactured, and installed this equipment, and adopted the name “SolarBee” for this technology in Sept, 2001.
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