| Abstract
| - Nitrification is an important part of activated sludgewastewater treatment processes in view of the severeeffluentdischarge standards for nitrogen (N) that are nowadaysimposed by legislation. Several on-line analyzers havebeendeveloped to achieve better monitoring and control ofbiological N removal processes. In this paper, theresultsof on-line experiments on a pilot-scale activated sludgeplant with a recently developed titrimetric sensor aredescribed. Based on a titration of an activatedsludgesample, it was possible to estimate the ammonium N(NH4+-N) concentration in the activated sludge, without the needfor any sample pretreatment. The NH4+-Nconcentrationsobtained with the titration method were consistent withthe NH4+-N concentrations measured with anon-line analyzer,which was operated on the effluent of the pilot plant.Contrary to chemical on-line NH4+-Nanalyzers, the titrationmethod provides data about the nitrification rate of theactivated sludge.
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