The ozonation of tertiary effluent for advanced wastewater treatment requires a comprehensive control strategy in order to guarantee stable, efficient and economic operation. In the present study the dissolved organic carbon (DOC) in the influent to the ozonation plant was selected as key control parameter and residual ozone in the effluent was included as a secondary control. The objective was to evaluate UV/Vis (ultraviolet-visible)-spectrometry for the calculation of equivalent concentrations for the control parameters DOC and ozone using cross-validated PLSR models. The results of the DOC model were in good agreement with the laboratory reference data. Eighty percent of the validation data had a relative error below 10%, while the mean relative error was 1.5%. Despite the interference of the organic matrix with ozone in the UV-range an independent ozone model was developed achieving a mean relative error of 5.6%. Based on the results obtained in this study, the novel approach of using UV/Vis-spectrometry for process control of effluent ozonation proved to have a high potential for practical application.

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