The independent pilot testing at SGWRF succeeded in meeting and exceeding all of the objectives of the pilot study while showing no fouling of the AFP tubes from algae or Bryozoa. The successful pilot testing assured SGWRF staff that Enaqua’s non-contact UV system would be an excellent candidate to replace their existing UV systems.
During the design evaluation phase, engineers (BOWEN COLLINS & ASSOCIATES, INC.) and SGWRF staff evaluated multiple competing UV systems on the market. The evaluation included technical comparison, financial comparison, operations and maintenance of the UV systems, and also site visits to UV installations for the competing systems.
The result of the technical evaluation favored Enaqua’s non-contact UV system, which impressed operators with its simplicity and ease of maintenance.
After a 2-year process of detailed technical design and engineering the project was bid and Alder Construction Company was selected as the preferred bidder in Q1, 2018.
The non-contact UV system designed for SGWRF has three (3) UV Channels, each equipped with a Model D9i.10103 UV reactor. The peak disinfection capacity of the UV system is 50.0 MGD, with 50.0% redundancy per UV Channel. A supervisory PLC is provided to optimise disinfection performance and energy usage in the UV system by utilising (1) flow pacing, and (2) level pacing (dose pacing) based on flow through the UV system and UV transmittance (%) of the effluent.
The St. George Water Reclamation Facility (SGWRF) in St. George, UT was an early adopter of UV disinfection technology and operates UV systems with two different (independent) UV configurations: a traditional low-pressure horizontal UV system, and a medium-pressure UV system. The existing UV systems have been operating for approximately 15-20 years.
Due to the age, serviceability, and availability of parts for the existing UV systems, the city of St. George planned on replacing them as part of planned upgrades to their facility.
Familiar with operating traditional Quartz-based UV systems, operations personnel at SGWRF were very interested in Enaqua’s non-contact UV systems, and the advantages associated with the technology; namely energy efficiency, dry UV lamps, significantly lower operating/maintenance costs and improved fouling resistance of the AFP tubes.
The city requested an on-site pilot demonstration to properly evaluate the disinfection performance, anti-fouling, anti-scaling performance, and ease of maintenance of Enaqua’s non-contact UV systems.
Enaqua provided a self-contained UV reactor in an enclosed pilot trailer and a technical protocol for the pilot testing. Using the protocol, SGWRF staff performed a three-month pilot study from August to October 2015. The pilot study was done in the summer because the existing UV systems SGWRF experience biofouling from algae and Bryozoa during the summer months.
The St. George Water Reclamation Facility (SGWRF) in St. George, UT was an early adopter of UV disinfection technology and operates UV systems with two different (independent) UV configurations: a traditional low-pressure horizontal UV system, and a medium-pressure UV system. The existing UV systems have been operating for approximately 15-20 years.
Due to the age, serviceability, and availability of parts for the existing UV systems, the city of St. George planned on replacing them as part of planned upgrades to their facility.
Familiar with operating traditional Quartz-based UV systems, operations personnel at SGWRF were very interested in Enaqua’s non-contact UV systems, and the advantages associated with the technology; namely energy efficiency, dry UV lamps, significantly lower operating/maintenance costs and improved fouling resistance of the AFP tubes.
The city requested an on-site pilot demonstration to properly evaluate the disinfection performance, anti-fouling, anti-scaling performance, and ease of maintenance of Enaqua’s non-contact UV systems.
Enaqua provided a self-contained UV reactor in an enclosed pilot trailer and a technical protocol for the pilot testing. Using the protocol, SGWRF staff performed a three-month pilot study from August to October 2015. The pilot study was done in the summer because the existing UV systems SGWRF experience biofouling from algae and Bryozoa during the summer months.
The independent pilot testing at SGWRF succeeded in meeting and exceeding all of the objectives of the pilot study while showing no fouling of the AFP tubes from algae or Bryozoa. The successful pilot testing assured SGWRF staff that Enaqua’s non-contact UV system would be an excellent candidate to replace their existing UV systems.
During the design evaluation phase, engineers (BOWEN COLLINS & ASSOCIATES, INC.) and SGWRF staff evaluated multiple competing UV systems on the market. The evaluation included technical comparison, financial comparison, operations and maintenance of the UV systems, and also site visits to UV installations for the competing systems.
The result of the technical evaluation favored Enaqua’s non-contact UV system, which impressed operators with its simplicity and ease of maintenance.
After a 2-year process of detailed technical design and engineering the project was bid and Alder Construction Company was selected as the preferred bidder in Q1, 2018.
The non-contact UV system designed for SGWRF has three (3) UV Channels, each equipped with a Model D9i.10103 UV reactor. The peak disinfection capacity of the UV system is 50.0 MGD, with 50.0% redundancy per UV Channel. A supervisory PLC is provided to optimise disinfection performance and energy usage in the UV system by utilising (1) flow pacing, and (2) level pacing (dose pacing) based on flow through the UV system and UV transmittance (%) of the effluent.
St. George Water Reclamation Facility
New Enaqua non-contact UV installation will ensure simpler, safer and cleaner water at St. George Water Reclamation Facility.
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