Renewable Resources

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


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.

Annual Biosolids Report (PDF)

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)