Cedar Treatment Facility

In April, 2001, Seattle Public Utilities (SPU) in Seattle, Washington, awarded CH2MHill Constructors Inc., a contract for the design, permitting, construction, and long-term facility operation for the City of Seattle’s Cedar Treatment Facility Design Build Operate Project. The City of Seattle set the following, overall water quality protection goals:

- Provide strong public health protection
- Comply with current and anticipated drinking water regulations
- Maintain and increase customer confidence in the drinking water supply
- Minimize environmental impacts

Cedar Treatment also set the following objectives:

- Build on SPU's existing, multiple-barrier approach to provide reliable public health protection, and specifically, to provide treatment forCryptosporidium
- Address taste and odor issues


An extensive review process involving major UV manufacturers was undertaken by CH2MHill to select the UV supplier for the Cedar River Project. The evaluation process examined factors such as each supplier’s technical knowledge and expertise related to UV disinfection, technology offerings, and initial capital and operation costs. Utilizing these criteria, TrojanUV was chosen as the supplier of choice for this project. The project includes a total of thirteen TrojanUVSwift™ units designed to treat up to 180 million gallons per day of drinking water.

CH2MHill Representative, Scott Trusler, Design Manager, said, 'The TrojanUVSwift™ system was selected for this project due to its compact footprint, advanced control features, and after extensive validation testing that has been conducted on the system which in combination best met the DBO project objectives for the Cedar Treatment Facility DBO Project.”

Trojan will supply thirteen UV systems to CH2MHill Constructors Inc., the company selected by Seattle Public Utilities to permit, design, build and operate the treatment facility. 'Based on our evaluation process which considered many technical and non-technical factors, TrojanUVSwift™ provided the best overall solution for the unique needs of this project,' said Scott Trusler, Design Manager for CH2MHill.

The Cedar Treatment Facility will treat approximately two-thirds of the City’s current water supply, serving a population of 1.3 million people. The project includes ozone treatment, UV disinfection, and two clearwells designed to store up to 20 million gallons of potable water. The design-build-operate (“DBO”) contract for the Cedar Treatment Facility represents the first large, municipal drinking water plant in the United States to use ultraviolet light in conjunction with ozone for disinfection purposes and will be the largest UV disinfection system in the world treating municipal drinking water. The new treatment process will ensure the Cedar water supply meets or exceeds current, and expected, new federal water quality standards.

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