Degradation of Benzothiazole by Ozonation and Adsorptive Ozonation

L. Sumegová, J. Derco and M. Melicher

Abstract
The paper deals with the study of the use of ozonation for removal of benzothiazole rom model wastewater in order to perform chemical transformation and facilitate consecutive biological mineralization of ozonation products. Adsorption of benzothiazole on active carbon and integrated ozonation of benzothiazole with the addition of active carbon, were also studied. Lab-scale ozonation experiments were performed using ozone prepared from pure oxygen. Concentration values of benzothiazole as well as COD and TOC were measured during experiments. The oxidation intermediates of the processes were also studied. The best efficiency of benzothiazole degradation and transformation was observed when the combined ozonation/activated carbon process was applied. Respirometric measurements were carried out in order to evaluate the impact of ozonation products on the activated sludge microorganisms activity. Enhancement of biodegradability by ozonation was indicated by the increase in oxygen uptake rate with an increase in dosed volume of ozonated sample into respirometric cell.

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Keywords
activated sludge, benzothiazoles, ozonation, respirometric measurements, toxicity