Renewable Resources

Creating resources from wastewater

As part of its commitment to environmental stewardship, LOTT captures and reuses renewable resources from the wastewater treatment process.

Biosolids
LOTT produces Class B biosolids. Solids from wastewater are collected and pumped into digesters where they are heated and kept in treatment for about 30 days. The treated solids are then dewatered in a centrifuge. The resulting biosolids are hauled off-site and reused as soil amendment on farm and forest lands.

Methane Gas
In the digesters, anaerobic bacteria convert nearly half the solid matter to methane and other biogas. The gas is used in LOTT’s cogeneration system to produce both heat energy and electricity. The system produces enough electricity to serve the needs of LOTT’s Regional Services Center, saving around $150,000 in electric costs per year. Heat from the system serves the Regional Services Center, buildings and processes within the treatment plant, and the neighboring Hands On Children’s Museum.

Cogeneration System Fact Sheet (PDF)

Reclaimed Water
Reclaimed water is used water that is treated and cleaned so it can be reused safely. All water is recycled in nature. LOTT's reclaimed water facilities mimic nature’s processes to filter and clean used water to produce Class A Reclaimed Water – the highest quality of reclaimed water designated by Washington State’s Departments of Health and Ecology. Class A Reclaimed Water can be used for almost all uses, except drinking.