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The City of Bozeman, Montana (pop. 36,000) recently converted the operation of its complete mix activated sludge aeration basins to plug flow basins operating in a phased nitrification-denitrification mode. Operation in phased nitrification denitrification mode has reduced the plant's
effluent total nitrogen by 40% without sacrificing ammonia removal. Sludge volume index values also dropped slightly with this modification. Chlorine use for filament control and disinfection has dropped from 52 tons per year to 32 tons per year. The total capital cost for project implementation
was 180,000. The process uses pH and ORP probes to control and optimize nitrogen removal efficiency.
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