John J. Carroll Water Treatment Plant

Upgrade Enhances Water Treatment Plant with UV Disinfection and Innovative Renovation Enables Uninterrupted Operations and Cutting-Edge Equipment Integration

This $30 million project consisted of renovating the 200 MGD John J. Carroll drinking water disinfection plant by installing new ultraviolet disinfection equipment.

The scope of work required all new electrical for the renovations, instrumentation, controls, and HVAC equipment, accomplished by creating a temporary bypass of the two extended ozone contact chambers so the demolition of the concrete roofs and baffle walls could be done. This allowed for the accommodation of 12 Calgon’s Sentinel Chevron 48 reactors and all ancillary equipment.

A temporary sodium hypochlorite feed system was be installed to allow for the removal and relocation of existing chemical feed points for sodium hypochlorite and sodium bisulfite. The project was completed in two phases, which allowed the MWRA to operate the plant at half capacity for the entire duration of the project.