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Case Studies and
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Case Study for Customer Location
CA50:
Reservoir or Lake Use:
Municipal wastewater treatment system for a city, population
5,500.
System Overview and Reservoir:
Cell 1: 1.6 acres, 10 ft deep, 3.2 million gallons, loading is
903 lbs of BOD/acre day, has 40 hp of grid aeration that was
operating 24 hours per day. Cell 2: 2.27 acres, 8 ft deep, 5.3
million gallons, has 20 hp of grid aeration that was operating
24 hours per day. Flow rate: 0.8 MGD, with 100% of the flow to
Cell 1, then to Cell 2, then to Cell 3 (Perc Pond). System has
continuous discharge. Detention time in cell 1 = 4 days; Cell 2
= 6.6 days.
Reported Problem Before SolarBee Installation:
High energy costs to maintain 24-hour per day grid aeration.
SolarBee Installation:
Date: April 2002. Cell 1: 1 SB2500 with 24-hour electrical kit.
Cell 2: 1 SB2500 with 24-hour electrical kit.
Results:
The customer was immediately able to reduce the run time on
aerators, and saved about 30% energy savings in Cell 1 and 75%
energy savings in Cell 2, totaling $37,000 per year on
electrical savings. City applied for and received a California
Energy Commission (CEC) Grant base on removing all 60 hp from
peak load. The CEC report on the measurement and verification of
results is available. In February 2003, a SB10000 was installed
in Cell 1, while the SB2500 from Cell 1 was moved to Cell 2, for
a total of 2 SB2500's in Cell 2. Estimated energy savings in
2003 were also realized in 2004 and 2005. The customer reports
all is going well, and they are happy with the performance of
the units.
Photo shows SolarBee 2500 in cell - note ripples on pond
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