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Case Study for Customer Location
CA62:
Reservoir or Lake Use:
Industrial wastewater pretreatment facility for a dried fruit
operation.
System Overview and Reservoir:
Pretreatment pond: 1.1 acre, 12 ft deep, 10 ft operating depth,
2.4 MG capacity. Factory loading to the pond is 0.1 MGD
(continuous flow for most of year) containing up to 8000 mg/L
BOD. The flow path is to a barscreen, then to a bubble air
flotation (BAF) system, then to the aerated pretreatment pond,
then to a dissolved air floatation (DAF) system, and then the
effluent is discharged to the city system. The effluent has
about 900 mg/L BOD. Detention time in the pond is 24 days. The
pond had 100-hp grid aeration (4 x 25 hp) for both mixing and
adding dissolved oxygen (DO) that operated 24 hours/day, 365
days/year.
Reported Problem Before SolarBee Installation:
Factory experienced high energy costs of approximately $96,000
per year (at $0.13 per kwh). At full factory production, the
estimated power needed for DO production is about 100 hp (at 2
lbs/hr/hp), which is higher than the estimated 75 hp needed for
mixing (30 hp per MG of reservoir volume), so the SolarBee
cannot do much at full factory production levels. But during
reduced production periods, the power needed for DO production
is much lower than the hp required for mixing, so it was
determined that a SolarBee could provide most off the mixing hp
during those periods, with annual power savings equal to
removing 1 x 25 hp aerator from the system year round, or 25%.
SolarBee Installation:
Date: November 2002, installed (1) SB10000W with a 24-hour
electrical kit.
Results:
Company management reports that the SolarBee has consistently
allowed them to run without one of their 4 aerators, producing a
minimum of 25% energy savings annually. In the slow season, they
are able to turn off 2 aerators for even more savings. Other
benefits include complete mixing, preventing shortcircuiting in
the pond. They estimate a less than 2-year payback on energy
savings alone.
Shows the SB10000W in the pretreatment pond between two
splashers
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