AWWA ACE58286

Against the backdrop of recent E-coli and Cryptosporidium outbreaks in Canada, the community of Canyon Creek (population 800) elected to adopt a comprehensive treatment upgrade strategy. As a first step towards addressing more stringent water quality requirements, pilot testing of membrane filtration and ultraviolet (UV) disinfection technologies was undertaken. "Three" different types of membrane units were pilot tested as means to proof test their performance and applicability for the high TOC (14 mg/l) and algae-laden raw water source. Testing included assessment of powdered activated carbon (PAC), granular activated carbon (GAC) and enhanced coagulation techniques to maximize organics removal. In addition to the pilot testing work undertaken, another unique aspect of this project was the decision to integrate the old package plant unit as part of the new treatment scheme. The design allows the existing package plant to be used as a pretreatment step upstream of the membrane system. This has the technical benefit of minimizing the loading on the membranes and in so doing maximizing their lifespan. From a financial perspective, it has the benefit of maximizing the use of existing infrastructure while reducing overall construction costs. This paper provides an overview of the project drivers, the comprehensive pilot testing work undertaken, the unique design features of this integrated system (conventional treatment & membrane) and the challenges posed by winter construction and cold weather operation. Includes figures.