American Canyon Wastewater Treatment Plant
The American Canyon Wastewater Treatment Plant (WWTP) began operations in October 2002 with then state-of-the-art secondary treatment that featured one of the nation’s first uses of tandem membrane bio-reactor/UV disinfection in the process chain. As with many other early membrane bio-reactor treatment plants, this plant had a number of design deficiencies, which became apparent over time as the equipment aged, the utility’s customer base expanded, and more stringent environmental regulations were enacted.
A Condition Audit is one of the services offered through Xylem TotalCare, a comprehensive portfolio of services that ensures equipment from all Xylem will always run at its best. At the time of the TotalCare Condition Audit, the UV system was operating all three banks of UV lamps in the channel at full power instead of modulating the arrays. Recommendations included a complete re-lamping with newer, more energy-efficient Wedeco Ecoray® UV lamps and ballasts; a PLC processor enabling monitoring by the plant’s SCADA; improved instrumentation; and a transmissivity monitor in the influent channel, along with UV intensity sensors in the dosing zones.