Bellvue Lake WTP Disinfection Evaluation
Project Details
Client
City of Greeley Water & Sewer Department
Location
Greeley, CO
Services Provided
Compliance Evaluation
Infrastructure Design
Project Highlights
- 35 MGD Capacity
- 9 Baffle Walls Installed
- 500 Horsepower
This study performed an evaluation of the Bellvue WTP to meet the Log Inactivation requirements for Giardia and viruses to verify compliance with Federal and CDPHE Surface Water Treatment Rules (SWTRs).
The evaluation showed that the Bellvue WTP disinfection practices could meet log inactivation requirements within the WTP by adding baffles to the clearwell to achieve a baffling factor of 0.7. In addition, the project evaluated and designed changes to the sampling points for chlorine residual to optimize and confirm the disinfection credit calculations. The proposed disinfection plan achieved all Log Inactivation requirements within the plant site; allowing the WTP to comply with the regulations for the finished water to the City, as well as the on-site water system at the WTP. Work on the WTP included furnishing and installing 8 approximately 67’ by 16’ FRP baffle walls, one approximately 19’ by 16’ perforated baffle wall, supported with FRP columns, and one 5’ by 5’ double door aluminum access hatch. The project also involved installation of new disinfection residual sampling points as well as integrating all the sampling points into the WTP SCADA system.