At the RAE Water & Sewer District near Bozeman, Mont., just two operators do all the work at a 70,000 gpd activated sludge treatment plant. And they do an exemplary job with an innovative process.
An advanced biological nutrient removal (BNR) plant using a sequencing batch reactor (SBR) treats the water to exceptionally high standards before infiltration to the groundwater. The reactor tanks are housed in a greenhouse that prevents freeze-ups during long, cold winters. The solids are wasted to an aerobic digester and then stored and treated in reed beds. The plant is operated via PLC and monitored with a
