LOTT Construction

Updates on LOTT construction projects

Disinfection System Upgrades
One of the next big projects at the Budd Inlet Treatment Plant is an upgrade of the ultraviolet (UV) light disinfection system. LOTT uses UV light in the final stage of wastewater treatment to disinfect the water prior to discharge into Budd Inlet. UV light works to render bacteria harmless. To ensure that wastewater treatment continues uninterrupted, this project will require setting up a temporary disinfection system while the new system is constructed. Project design is underway and construction is scheduled to begin in 2019.

Technical Memo on Temporary Disinfection (PDF)

Recently Completed – Sludge Dewatering System Upgrade
Sludge dewatering is one of the final steps in the treatment of solids extracted in the wastewater treatment process at the Budd Inlet Treatment Plant. Dewatering requires powerful motors to spin the waste to extract excess liquids. The final product is Class B Biosolids, which are used as a soil amendment applied to dry land wheat fields in Eastern Washington.

The Sludge Dewatering System Upgrade involved replacing three old centrifuges and upgrading associated equipment. This large-scale project was complex for a number of reasons. It required disruptions in a busy and vital area of the Budd Inlet Treatment Plant. This plant must run 24 hours a day, every day, and dewatering of sludge had to continue even during construction. The project also required numerous power shut-downs to make electrical upgrades. Installation of a temporary dewatering system was necessary and project activities, including power shutdowns, had to be carefully coordinated to allow for uninterrupted wastewater treatment. This project was completed successfully in 2017, on time and under budget. The new system is more reliable, provides better operational control, improves safety, and increases energy efficiency.