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Case Studies and
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Case Study for Customer Location
CO63:
Reservoir or Lake Use:
Raw water storage reservoir, located in front of a drinking
water plant, to provide some settling and to take up surge flows
in the system. Source water is piped in from the South Platte
River.
System Overview and Reservoir:
Surface area is 11 acres; volume is 250 acre-feet (81 MG).
Maximum depth is 20 feet when full; average depth is 14 feet.
Depth typically fluctuates 2-4 feet during the year. Average
withdrawal rate is 3 MGD, so hydraulic residence time is
approximately 27 days.
Reported Problem Before SolarBee Installation:
Initial objectives were to resolve problems of high
concentrations of algae. During summer months, owner had to
treat the reservoir 1-2 x per week with copper sulfate to
prevent clogging in the plant. Owner had tried using a 30 hp
aerator, but shut it down because it did not solve the algae
problem and it had continual mechanical problems.
SolarBee Installation:
Date: July 2002. Installed one SB10000F, solar-powered, with
intake hose initially set at 9 feet due to the sludge depth in
the reservoir.
Results:
Algae blooms have disappeared and the City has not had to treat
the reservoir with copper sulfate in the years since the
SolarBee unit was installed, even though it was installed after
blue-green algae were established in July (2002). In March 2003,
the City disclosed for first time that the reservoir also had a
manganese problem. Therefore, the intake hose was lowered to the
deepest part of reservoir so the SolarBee could perform
hypolimnetic aeration (maintaining sufficiently high DOs down to
bottom sediments) to prevent manganese release. Lowering the
intake hose apparently solved the manganese problem. By October
2004 enough sludge had been oxidized that the SolarBee intake
was lowered further. Consequently, turbidity readings were
greatly reduced when the wind stirred up the reservoir. The
superintendent is very happy with the SolarBee’s performance,
and in 2005 purchased additional units for other applications
within the water storage/treatment system.
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