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Wild Horse Pass – UV
System Performance Validation Testing
WBA conducted full scale testing of the first UV testing facility
of the 2000 UV Guidelines. The system tested was the low-pressure,
high-output UV system located at the Wild Horse Pass Wastewater
Reclamation Plant south of Phoenix, Arizona. An array of virus
challenges and velocity profiles were performed to determine the
technology's capacity for application after media or membrane filtration.
The performance validation successfully gained the California Department
of Health Services' conditional acceptance of the technology for
the disinfection of wastewater for water recycling.
City
of Livermore – UV
System Performance Validation Testing
WBA conducted commissioning testing of the ultraviolet (UV) disinfection
system located at the City of Livermore Water Reclamation Plant.
Performance testing was performed by dosing a surrogate microorganism
(MS-2 bacteriophage) under a variety of water quality conditions
in accordance with the NWRI/AWWARF UV Guidelines. The performance
validation demonstrated that the disinfection efficiency of the
UV system improves with increasing flow rates. Virus inactivation
results from the performance validation were used to determine
the system's capacity and will serve as the basis for permitting
the City's UV system for recycled water production.
City
of Sunnyvale – UV
Disinfection Feasibility Study
WBA evaluated disinfection alternatives to the City of Sunnyvale’s
existing chlorination system. The study included laboratory analyses
of UV disinfectability parameters of the City’s effluent
under various operating conditions, and sizing and cost analysis
for different types of disinfection systems for various combinations
of recycled water production and disinfection for Bay discharge.
The analysis included required UV dosages, system sizing, capital
and operation cost estimates, and discussion of related non-cost
issues.
DERWA – Filtration
and Disinfection Evaluation
WBA evaluated filtration and disinfection systems to produce
recycled water for unrestricted use by the DSRSD•EBMUD
Recycled Water Authority (DERWA) as part of the recycled
water treatment facilities
master plan. DERWA is a joint project between the East Bay
Municipal Utility District and the Dublin San Ramon Services
District to
provide 16.5 million gallons per day of recycled water for
irrigation in the Dublin and San Ramon Valley. Four types
of filtration
systems (dual media filters, continuous backwash filters,
synthetic medium
filters, and microfiltration) and four types of disinfection
systems (sodium hypochlorite, low-pressure low-intensity
UV, medium-pressure
high-intensity UV, and low-pressure high-intensity UV) were
evaluated.
Town
of Yountville – Fuzzy
Filter Project
WBA assisted the Town of Yountville, California in the design,
installation and testing of an alternative tertiary filtration
system to satisfy the requirements for unrestricted landscape
irrigation of the Title 22 regulations of the California
Department of Health
Services. The alternative filtration system, known as the "Fuzzy
Filter", was developed in 1985 and at the time of the project,
the new filter in Yountville was the first full-scale installation
in California. WBA evaluated the manufacturer's proposal to furnish
the fuzzy filter, prepared plans and specifications for installation
of the unit and assisted the Town during the construction period.
After the installation was complete, WBA designed and assisted
the Town in carrying out a testing program to validate the performance
of the unit to meet the required turbidity removals in the Title
22 regulations.
The above projects are representative of our experience in this area.
If you
would like additional information on these, or other projects that
we
have completed, please contact us.
For detailed descriptions
of representative projects in our other areas of expertise,
click below on the category you are interested in:
Recycled Water:
Wastewater:
Water Supply:
Specialized
Areas:
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