John Carroll Water Treatment Plant

This project included the installation of ultraviolet (UV) disinfection equipment at the John J. Carroll Water Treatment Plant in Marlborough, MA.

Client:   MWRA
Designer:  CH2MHill (now Jacobs)
Capacity:  405 MGD

Project Features

  • Twelve new in-line ultraviolet units.
  • New HVAC and electrical systems controls.
  • Demolition of concrete roofs and baffle walls in the two extended ozone contact chambers.
  • Temporary bypass.
  • Removal and relocation of existing chemical feed points.
  • Temporary sodium hypochlorite feed system.
  • Two construction phases allowed the plant to operate at half capacity.

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