Estimation of the active nitrifying biomass in activated sludge

An in situ nitrifier mass estimation technique was developed to estimate the nitrifier population within an activated sludge sample using dominant cultures of nitrifying organisms. This technique was applied to activated sludge samples from the Milton, Ontario Wastewater Treatment Plant and the results were compared to nitrifier population estimates calculated using the IAWPRC (now IAWQ) Activated Sludge Model No. 1 (ASM1). Several sets of …