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Case Study for Customer Location
CA69:
Reservoir or Lake Use:
This is an enclosed water storage reservoir for potable
chloraminated water.
System Overview and Reservoir:
Reservoir has a surface area of 1.32 acres with a maximum volume
of 5.8 million gallons. Deepest depth is 20 feet when full, but
will drop to a 12-foot operating depth periodically. Average
withdrawal rate is 1.5 MGD, so average hydraulic residence time
is 3.8 days. Reservoir has a submerged divider wall splitting
the reservoir into 2 halves, and 136 redwood columns supporting
the roof.
Reported Problem Before SolarBee Installation:
The reservoir had a history of periodic stratification,
resulting in old and variable water age. Objectives were to
thoroughly mix the reservoir to prevent stratification, maintain
uniform water age, and to prevent nitrification after the City
converted to a chloramine based treatment system in February
2004.
SolarBee Installation:
Date: Jan 2003. Installed one SB10000F with a 24-hour electric
kit and roof-mounted solar rack, with intake hose set at 15.5
ft. The machine was installed through a 9.5' X 9.5' hatch in the
roof, assembled on the sidewall slope within the tank, and
anchored to the support columns in the tank. In June 2005, the
single SB10000F unit was changed out to two (2) SB1250v12 units,
one deployed on either side of the baffle wall.
Results:
SolarBee-induced circulation turns over the reservoir once every
2 days, sufficient to provide the desired benefits and meet
stated objectives. Since the initial SolarBee installation, the
units have maintained destratified conditions and more uniform
water age within the reservoir. Following the conversion to a
chloramine-based system, SolarBees have also prevented unwanted
nitrification (and associated treatment costs) in the stored
water. The city has been very pleased with the SolarBees’
performance and associated water quality benefits.
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