Case Study

Clari-DAF® System Provides Effective TOC Removal For Cambridge WTP

Source: Leopold -- A Xylem Brand

To ensure treated water complied with the most stringent drinking water standards, including the Environmental Protection Agency (EPA) Stage 2 Disinfectants and Disinfection Byproducts Rule (State 2 DBPR), the City of Cambridge, MA, WTP decided to implement a robust multibarrier treatment solution.

The utility installed a Leopold® Clari-DAF® clarification system with two 12 MGD trains consisting of 12 concrete flocculators, six concrete DAF basins, two full recycle systems, and monitoring and controls. The Clari-DAF® system is followed by ozone for primary disinfection, granular activated carbon gravity filters operated as biological filters, then chlorine to provide a secondary disinfectant.

After one year of operating the Leopold Clari-DAF system, TOC removal through the treatment plant has consistently exceeded the Stage 2 DBPR requirements.