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February 5, 2024

National Finalist: Gold Award
Water and Storm Water

Photo from ACEC Washington
LOTT enhanced its Budd Inlet Treatment Plant with new mixing technology that significantly reduced power consumption.

Parametrix

Project: Budd Inlet Treatment Plant biological process improvements
Client: LOTT Clean Water Alliance

The LOTT Clean Water Alliance undertook a groundbreaking project to enhance its biological nutrient removal process, focusing on optimizing and intensifying nutrient removal from treated water in Budd Inlet. The project introduced innovative treatment processes, including the adoption of new large-bubble mixing technology, which replaced the existing system, significantly reducing power consumption. This innovative mixing system allowed for dynamic control of aerobic and anoxic modes, resulting in near-theoretical limits for nutrient removal.

The plant control system is one of the most advanced in the country, enabling real-time monitoring and optimization of biological nutrient removal processes. The plant’s use of ammonia control and the implementation of advanced sensors set it apart in the industry.

“Parametrix has worked with LOTT on several projects since the 1980s, and together we have developed a team delivery process that has been instrumental in the success of complex projects,” said LOTT Executive Director Matthew Kennelly. “This process allows those who know our plant best, the operators and staff, to be involved in the design, resulting in design solutions that are efficient and optimized. This approach enabled seamless coordination, ensuring the three years of active construction within the treatment plant did not impeded LOTT’s ability to continuously treat wastewater and meet all permit requirements.”

The team also utilized variable speed drives and advanced control strategies to enhance energy efficiency. The project was complex, and the need to keep the plant operational throughout construction required the systematic shutdown and replacement of key components. The project was completed on time and under budget with minimal change orders. The innovative process serves as a model for addressing nutrient reduction in ecosystems like Puget Sound, and sets a new standard in wastewater management.


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