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Case Studies and
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Case Study for Customer Location
CA56:
Reservoir or Lake Use:
Municipal wastewater 5-pond treatment system for a population of
6,000.
System Overview and Reservoir:
Pond 1 is 1.1 acres, 10 ft maximum depth, 2.4 MG capacity,
loading is 799 lbs BOD/acre/day, and had 50 hp of grid aeration
operating 24-hrs/day; Pond 2 is 1.1 acres, 10 ft maximum depth,
2.5 MG capacity, and had 50 hp of grid aeration operating 24
hrs/day; Pond 3 is 2.3 acres, 9.5 ft maximum depth, 6.2 MG
capacity, and had 30 hp of grid aeration operating 24 hrs/day;
Pond 4 is 2.9 acres, 11 ft maximum depth, 8.2 MG capacity, and
had 20 hp of grid aeration operating 24 hrs/day; Pond 5 is 2.2
acres, 9 ft maximum depth, 5.2 MG capacity, and had 10 hp of
grid aeration operating 24 hrs/day. Flow rate is 0.45 MGD, with
100% of the flow to Pond 1, then to Pond 2, then to Pond 3, then
to pond 4, then pond 5, then to irrigation reservoir 1, and then
finally to irrigation reservoir 2. System irrigates as needed.
Total system detention time in Ponds 1-5 is 54 days. Most
critical discharge permit limit is 40 mg/L BOD; there are no TSS
or ammonia limits.
Reported Problem Before SolarBee Installation:
High energy costs, excessive algae in Ponds 4 and 5 caused high
pH over the limit of 9.
SolarBee Installation:
Date: June 2002, installed in Ponds 1-3: one (1) SB10000W with
24-hour electrical kit in each pond; installed in Ponds 4 and 5:
one (1) solar-powered only SB10000W in each pond. The two units
in Ponds 4 and 5 were converted to dual mix (SB10000DM), solar
only, in December 2003.
Results:
Municipality applied for and received a California Energy
Commission Grant based on peak load reduction and energy
efficiency. Energy reductions: 25% in Pond 1, 75% in Pond 2, 75%
in Pond 3, 100% in Pond 4, 100% in Pond 5. Customer is very
pleased with the water quality benefits and energy savings
provided by using SolarBees in their treatment ponds.
Photo shows one SolarBee among two splashers in Pond 2
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