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Description: Overcoming the Challenges of a Minimum Continuous UV Dose Requirement for...
Overcoming the Challenges of a Minimum Continuous UV Dose Requirement for Disinfection of Secondary Effluent
Abstract
Facing a number of drivers related to disinfection performance and redundancy, the Stamford Water Pollution Control Authority (SWPCA) retained Hazen and Sawyer (Hazen) to evaluate alternatives for upgrading and expanding the existing ultraviolet (UV) disinfection system at the Stamford Water Pollution Control Facility (WPCF). This technical paper will review the following: National Pollutant Discharge Elimination System (NPDES) permit limits at the Stamford WPCF; Field sampling conducted to understand bacteriological reductions required of the plant’s disinfection process; Bench-scale collimated beam testing for two indicators to inform UV disinfection design dose requirements; Design considerations to ensure compliance with bacteriological limits for fecal coliform and Enterococcus and with a continuous minimum UV dose requirement; and An approach to construction that allowed the plant to maintain continuous operation of the UV disinfection process during replacement of the existing UV system.
The Stamford WPCA evaluated alternatives for upgrading and expanding its UV disinfection system at the Stamford Water Pollution Control Facility (WPCF) in Stamford, CT. Primary drivers for this evaluation included planning for compliance with more stringent permit limits for Enterococcus, the need to add standby UV disinfection equipment at the plant's peak design flow, and measures needed to comply with the plant's NPDES permit requirement for the UV dose to always be a minimum 30 mJ/cm2.
SpeakerHross, Matt
Presentation time
08:30:00
09:00:00
Session time
08:30:00
10:00:00
SessionUV Disinfection: Where are we? Where are we going?
Session locationRoom S404c - Level 4
TopicDisinfection and Public Health, Intermediate Level, Municipal Wastewater Treatment Design, Research and Innovation
TopicDisinfection and Public Health, Intermediate Level, Municipal Wastewater Treatment Design, Research and Innovation
Author(s)
Hross, Matthew
Author(s)M. Hross 1; B. Levin 2 ; M. Hross 1; M. Mann 3; W. Brink 2; R. Pudelka 4;
Author affiliation(s)Hazen and Sawyer 1; Hazen and Sawyer 2 ; Hazen and Sawyer, Wethersfield, CT 1; Hazen and Sawyer, Raleigh, NC 3; Stamford Water Pollution Control Authority 2; Stamford Water Pollution Control Authority 4;
SourceProceedings of the Water Environment Federation
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Oct 2023
DOI10.2175/193864718825159161
Volume / Issue
Content sourceWEFTEC
Copyright2023
Word count16

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