On-line monitoring of ozonation through estimation of Ct value, bromate and AOC formation with UV/Vis spectrometry
P. S. Ross (TU Delft - Civil Engineering & Geosciences, Arcadis)
A. W C Van Der Helm (Waternet)
J. Van Den Broeke (Optiqua Technologies)
L. C. Rietveld (TU Delft - Civil Engineering & Geosciences)
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Abstract
The application of ozone in water treatment serves many purposes, such as disinfection and degradation of organic micro-pollutants. To optimise the applied ozone dosage by on-line control, real-time information on the actual Ct value, the bromate and assimilable organic carbon concentration (AOC) is necessary. With UV/Vis spectroscopy, algorithms have been developed for the on-line determination of the Ct-value and the formation of bromate and AOC during ozonation. It was shown that these algorithms allow for the calculation of the optimal ozone dosage and provide a reliable indication of the amount of bromate and AOC formed during ozonation.