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Pilot Testing of a High-Rate Disk Filter for Water Recycling Applications and Title 22 Approval

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Pilot testing of the Nova Ultrascreen® (a high rate disk filter) was conducted at two water reclamation facilities in the Orlando, Florida area to demonstrate that the Ultrascreen® can produce an effluent that meets the California Title 22 Water Recycling Criteria turbidity requirements, at hydraulic loading rates ranging from 6 to 16 gpm/ft2. The pilot testing was conducted at water reclamation facilities that utilize a continuous backwash and cloth media disk filters for the production of recycled water. During the pilot testing the influent and effluent turbidity of both the Ultrascreen® and the continuous backwash and cloth media disk filters were monitored. Influent and effluent grab samples were collected and analyzed for particle size distribution. The results from the pilot-scale testing demonstrate that the Ultrascreen® can consistently meet the Title 22 turbidity limit of 2 NTU while operating at hydraulic loading rates ranging from 6–16 gpm/ft2. In addition the performance of the Ultrascreen® while operating at these higher loading rates of 6-16 gpm/ft2 was similar to the performance of the full-scale continuous backwash and cloth media disk filters operating at hydraulic loading rates of <3 gpm/ft2 and <5 gpm/ft2, respectively.
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Keywords: Tertiary filtration; Title 22; high-rate disk filtration; recycled water

Document Type: Research Article

Publication date: 2009-01-01

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