System for improved biological nutrient removal

摘要

A method is provided for the determination of NO₂^- and/or NO₃^- in water by subjecting the water sample to ultraviolet resonance Raman spectroscopy within the range of wavelengths of 200-240 nm, and determining the presence of NO₂^- and/or NO₃^- based on the Raman spectral measurement. The method has particularly applicability to the determination of such ions in wastewater, such as in activated sludge washwater treatment reactors. The method may also be employed with advantage in the control of processes involving the removal of ammonium ions upon reaction with oxygen.